Caterpillars (Lepidoptera)
Note: Caterpillar id can very difficult! Most of these have been identified by using the few books available on the subject and lots of help from Dave Wagner. Others who helped include Bob Barber, Mike Thomas, Jim Tuttle, and Tim McCabe... . Two fairly new books are useful:
-Caterpillars of Eastern North America by Dave Wagner. If you are interested in identifying caterpillars and live in the East, GET THIS BOOK. It is extremely good, and thorough, and also has many moths. (Princeton 2005).
-Caterpillars of the Field and Garden by Allen, Brock, and Glassberg. Helpful, with good photos, but has only butterflies and covers all of N America so less useful for any single region in the East (Oxford 2005).

Note that many of the images below are of prepupal caterpillars and their color may change drastically from what is typically depicted in the guides for each species.

I have these caterpillars arranged by page number in Wagner, and follow his common names and taxonomy. Ones I still can't identify are in the section at the bottom. Please let me know if you find any misidentified ones or can help with id!
Slug Caterpillars: Limacodidae
Shagreened Slug (Apoda biguttata)      p41

13 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Yellow-collared Slug (Apoda y-inversum) p41

22 Jul 2003, Kennesaw Mountain, Cobb County, GA
Yellow-collared Slug (Apoda y-inversum) p41

19 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Yellow-collared Slug (Apoda y-inversum) p41

Note parasite eggs (white spots).

9 Jul 2006, Kennesaw Mountain, Cobb County, GA
Skiff Moth (Prolimacodes badia)           p42

17 Sep 2002, Kennesaw Mountain, Cobb County, GA
Skiff Moth (Prolimacodes badia)           p42

5 Sep 2003, Kennesaw Mountain, Cobb County, GA
Skiff Moth (Prolimacodes badia)            p42

11 Sep 2003, Kennesaw Mountain, Cobb County, GA
Skiff Moth (Prolimacodes badia)            p42

12 Sep 2005, Kennesaw Mountain, Cobb County, GA
Nason's Slug (Natada nasoni)              p45

9 Sep 2002, Kennesaw Mountain, Cobb County, GA
Nason's Slug (Natada nasoni)                p45

11 Sep 2003, Kennesaw Mountain, Cobb County, GA
Nason's Slug (Natada nasoni)                p45

13 Sep 2003, Kennesaw Mountain, Cobb County, GA
  Crowned Slug (Isa textula)                   p46

19 Sep 2003, Kennesaw Mountain, Cobb County, GA
Crowned Slug (Isa textula)                    p46

12 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Crowned Slug (Isa textula)                   p46

30 Sep 2003, Kennesaw Mountain, Cobb County, GA

Note the white dot near the edge in the lower image, this may be the egg of a parasitic fly.
Purple-crested Slug (Adoneta spinuloides)
                                                             p47

7 Sep 2006, Crockford-Pigeon Mountain WMA, Walker County, GA

Note: The single white blob is probably from a parasitic wasp.
Spiny Oak Slug (Euclea delphinii)          p49

Kennesaw Mountain, Cobb County, GA

Note: I know this is a horrible photo, but I haven't been able to find any to get better photos of...
  Smaller Parasa (Parasa chloris)               p50

1 Sep 2003, Kennesaw Mountain, Cobb County, GA

Note: Spotted by Luke Theodorou, the only one I have ever seen...

 
  Stinging Rose Caterpillar (Parasa indetermina)                                        p51

10 Sep 2005, Prudence Island, Newport County, RI

 
 
  Saddleback (Sibine stimulea)               p52

L: 27 Aug 2002, R: 3 Sep 2002, both Kennesaw Mountain, Cobb County, GA
Saddleback (Sibine stimulea)               p52

20 Sep 2005, Kennesaw Mountain, Cobb County, GA
Flannel Moths: Megalopygidae
  Black-waved Flannel Caterpillar (Megalopyge crispata)                                                p54

10 Sep 2005, Prudence Island, Newport County, RI
Puss Caterpillar (Southern Flannel Moth) (Megalopyge opercularis)                       p54

23 Sep 2006, taken at Chattahoochee Nature Center, Fulton Co, GA
 
Skippers: Hesperiidae
  Silver-spotted Skipper (Epargyreus clarus)
                                                                p59

12 Sep 2002, Kennesaw Mountain, Cobb County, GA
 
Swallowtails: Papilionidae
Pipevine Swallowtail (Battus philenor)      p77

19 Jun 2003, Ocmulgee River, Twiggs County, GA
  Pipevine Swallowtail (Battus philenor)      p77

21 May 2006, Caddo River, Clark County, AR
  Pipevine Swallowtail (Battus philenor)      p77

11 Oct 2006, Williams Bluff Preserve, Early County, GA

Though still alive, this caterpillar did not look to be in very good shape...
Black Swallowtail (Papilio polyxenes)     p80

Sep 2002, Floyd County, GA
Black Swallowtail (Papilio polyxenes)     p80

15 Oct 2006, Paulk's Pasture WMA, Glynn County, GA
unk early instar swallowtail (possibly P glaucus)     p79

15 May 2006, High Falls State Park, Monroe County, GA
Whites and Sulphurs: Pieridae
Cloudless Sulphur (Phoebus sennae)       p89

27 Aug 2003, Kennesaw Mountain, Cobb County, GA
Cloudless Sulphur (Phoebus sennae)       p89

4 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Cloudless Sulphur (Phoebus sennae)       p89

23 Sep 2006, taken at Chattahoochee Nature Center, Fulton Co, GA
Brushfoots: Nymphalidae
Gulf Fritillary (Argraulis vanillae)          p110

9 Jul 2003, Kolomoki Mounds St Park, Early County, GA
Gulf Fritillary (Argraulis vanillae)          p110

23 Aug 2004, near Altamaha River, Long County, GA
Gulf Fritillary (Argraulis vanillae)          p110

16 Jan 2006, Honeymoon Island Sate Park, Pinellas County, FL
Gulf Fritillary (Argraulis vanillae)          p110

11 Oct 2006, Kolomoki Mounds State Park, Early County, GA
Question Mark (Polygonia interrogationis)  
                                                            p114

 

2 Jun 2004, Old Hwy 157, Dade County, GA
  Question Mark (Polygonia interrogationis)  
                                                            p114

 

12 Jun 2004, KY 218 at Little Barren River, Green County, KY
  Question Mark (Polygonia interrogationis)  
                                                            p114

 

23 Sep 2006, taken at Chattahoochee Nature Center, Fulton Co, GA
  Common Buckeye (Junonia coenia)      p120

earlier instar...

4 Sep 2004, Williams Bluff, Early County, GA
  Common Buckeye (Junonia coenia)      p120

8 Apr 2005, Williams Bluff, Early County, GA
  Common Buckeye (Junonia coenia)      p120

17 Aug 2005, Beaverdam WMA, Laurens County, GA
  Common Buckeye (Junonia coenia)      p120

18 Sep 2005, Williams Bluff, Early County, GA
Common Buckeye (Junonia coenia)      p120

6 Oct 2005, Satilla River, Charlton County, GA
  Appalachian Brown (Satyrodes appalachia)
Note: It could be Northern Pearly-eye (Enodia anthedon)                                          p136      

10 Jun 2003, Murray County, GA
Monarch (Danaus plexippus)                 p138

4 May 2003, Pine Log WMA, Bartow County, GA
Monarch (Danaus plexippus)                 p138

Several different individuals in the same field.

12 Jun 2006, Cave Research Pond, Mammoth Cave National Park, Hart County, KY
Loopers, Inchworms, and Spanworms: Geometridae
Juniper Geometer (Patalene olyzonaria)
                                                             p192
23 Sep 2006, taken at Chattahoochee Nature Center, Fulton Co, GA
True Silkworm and Apatelodine Moths: Bombycidae
Spotted Apatelodes (Apatelodes torrefacta)
                                                             p219
18 Sep 2003, Kennesaw Mountain, Cobb County, GA
Tent Caterpillars and Lappet Moths: Lasiocampidae
  Western Tent Caterpillar (Malacosoma californicum)                                      p225

13 Jul 2004, Glacier National Park, MT
  Eastern Tent Caterpillar (Malacosoma americanum)                                     p226

28 Apr 2005, Bibb County Glades, Bibb County, AL
  Forest Tent Caterpillar (Malacosoma disstria)
                                                           p227
29 Apr 2004, Kennesaw Mountain, Cobb County, GA
Forest Tent Caterpillar (Malacosoma disstria)
(several individuals)                                 p227

20 Apr 2006, Altamaha River at US 301, Long County, GA
Giant Silkworm and Royal Moths: Saturniidae
Hickory Horned Devil (Citheronia regalis)
                                                             p231

11 Sep 2006, Crockford-Pigeon Mountain WMA, Walker County, GA
 
Imperial Moth (Eacles imperialis)       p232

3 Oct 2003, Kennesaw Mountain, Cobb County, GA
Imperial Moth (Eacles imperialis)       p232

23 Sep 2006, taken at Chattahoochee Nature Center, Fulton Co, GA
Piegler's Oakworm (Anisota peigleri)  p235

13 Sep 2005, Kennesaw Mountain, Cobb County, GA
Spiny Oakworm (Anisota stigma)          p236

28 Aug 2003, Johns Mountain WMA, Gordon Co, GA
Third instar Spiny Oakworm (Anisota stigma)
                                                             p236

28 Aug 2003, Kennesaw Mountain, Cobb County, GA
  Spiny Oakworm (Anisota stigma)
                                                             p237

28 Sep 2004, Ohoopee Dunes Natural Area, Emanuel County, GA
  Spiny Oakworm (Anisota stigma)
                                                             p237

25 Sep 2006, Crockford-Pigeon Mountain WMA, Walker County, GA
  Pink-striped Oakworm (Anisota virginiensis)
                                                             p237

19 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Io Moth (Automeris io)                        p238

3 Sep 2002, Kennesaw Mountain, Cobb County, GA
Luna Moth (Actias luna)                       p241

13 Sep 2003, Kennesaw Mountain, Cobb County, GA
Luna Moth (Actias luna)                        p241

12 Sep 2005, Kennesaw Mountain, Cobb County, GA
Hornworms (Sphinx or Hawk Moths): Sphingidae
Catalpa Sphinx (Ceratomia catalpae)     p251

Several individuals... one tree.

23 Sep 2006, taken at Chattahoochee Nature Center, Fulton Co, GA
 
Pine Sphinx (Lapara coniferarum)        p254

3 Oct 2003, Kennesaw Mountain, Cobb County, GA
Pine Sphinx (Lapara coniferarum)        p254

13 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Appears to be a rare gray form of Pine Sphinx  (Lapara coniferarum).

1 Oct 2002, Kennesaw Mountain, Cobb County, GA
 

Small-eyed Sphinx (Paonias myops)    p263

11 Sep 2002, Kennesaw Mountain, Cobb County, GA
  Banded Sphinx (Eumorpha fasciata)    p276

3 Oct 2002, Suwanee Creek Greenway, Gwinnett County, GA
  Banded Sphinx (Eumorpha fasciata)     p276

6 Oct 2005, Laurens County, GA
Banded Sphinx (Eumorpha fasciata)     p276

Obviously a different form than the examples above, which are more common

15 Oct 2005, Bear Creek, Gadsden County, FL

The host plant is Ludwigia sp.
 
Banded Sphinx (Eumorpha fasciata)     p276

21 Oct 2006, Chattahoochee River National Recreation Area, Johnson Ferry North Unit, Cobb County, GA

 
   
Prominents: Notodontidae
  White-dotted Prominent (Nadata gibbosa)288

30 Aug 2002, Kennesaw Mountain, Cobb County, GA
  White-dotted Prominent (Nadata gibbosa)288

9 Sep 2002, Kennesaw Mountain, Cobb County, GA
  White-dotted Prominent (Nadata gibbosa)288

10 Sep 2002, Kennesaw Mountain, Cobb County, GA
  White-dotted Prominent (Nadata gibbosa)288

13 Sep 2003, Kennesaw Mountain, Cobb County, GA
  White-dotted Prominent (Nadata gibbosa)288
Note: Formerly known as the Green Oak Cat.

13 Sep 2003, Kennesaw Mountain, Cobb County, GA

 		 Angulose Prominent (Peridea angulosa) p292

17 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Angulose Prominent (Peridea angulosa) p292

20 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Oval-based Prominent (Peridea basitriens)     
                                                             p292

20 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Contracted Datana (Datana contracta) p294

3 Oct 2003, Kennesaw Mountain, Cobb County, GA
  Contracted Datana (Datana contracta) p294

19 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Walnut Caterpillar (Datana integerrima) p295

15 Sep 2003, Kennesaw Mountain, Cobb County, GA
  Walnut Caterpillar (Datana integerrima) p295

17 Sep 2006, Kennesaw Mountain, Cobb County, GA
Yellow-necked Datana (Datana ministra)296

5 Sep 2003, Kennesaw Mountain, Cobb County, GA
Angus' Datana (Datana angusii)           p297

12 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Angus' Datana (Datana angusii)           p297

17 Sep 2006, Kennesaw Mountain, Cobb County, GA
Datana sp. All early instars gregarious.

24 Jul 2003, Oakmulgee WMA, Bibb County, AL
Saddled Prominent (Heterocampa guttivitta)
                                                             p300
11 Sep 2003, Kennesaw Mountain, Cobb County, GA
Saddled Prominent (Heterocampa guttivitta)
Note: Not positive on this one               p300
11 Sep 2003, Kennesaw Mountain, Cobb County, GA
Saddled Prominent (Heterocampa guttivitta)
                                                            p300
13 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Saddled Prominent (Heterocampa guttivitta)
                                                               p300

19 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Oblique Heterocampa (Heterocampa obliqua)
Note: Two different individuals             p301
12 Sep 2005, Kennesaw Mountain, Cobb County, GA
White-blotched Heterocampa (Heterocampa umbrata)                                             p302

11 Sep 2003, Kennesaw Mountain, Cobb County, GA
  White-blotched Heterocampa (Heterocampa umbrata)                                             p302

13 Sep 2003, Kennesaw Mountain, Cobb County, GA
  White-blotched Heterocampa (Heterocampa umbrata)                                             p302

17 Sep 2003, Kennesaw Mountain, Cobb County, GA
  White-blotched Heterocampa (Heterocampa umbrata)                                              p302

19 Sep 2005, Kennesaw Mountain, Cobb County, GA
weakly-marked White-blotched Heterocampa (Heterocampa umbrata)                        p302

11 Sep 2003, Kennesaw Mountain, Cobb County, GA
Double-lined Prominent (Lochmaeus bilineata)                                            p303

5 Sep 2003, Kennesaw Mountain, Cobb County, GA
Double-lined Prominent (Lochmaeus bilineata)                                           p303

5 Oct 2003, Kennesaw Mountain, Cobb County, GA
Note: Many Double-lined Prominent and Variable Oakleaf Caterpillars not safely separable in the field... I think these are right but did not rear them out to be sure.
Variable Oakleaf Caterpillar (Lochmaeus manteo)                                               p304

10 Sep 2003, Pine Log WMA, Bartow County, GA
  Variable Oakleaf Caterpillar (Lochmaeus manteo)                                               p304

13 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Variable Oakleaf Caterpillar (Lochmaeus manteo)                                               p304

19 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Mottled Prominent (Macrurocampa marthesia)                                            p306

28 Oct 2004, Kennesaw Mountain, Cobb County, GA
Mottled Prominent (Macrurocampa marthesia)                                            p306

24 Sep 2005, Kennesaw Mountain, Cobb County, GA
 
Lace-capped Caterpillar (Oligocentria lignicolor)                                             p308

12 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Red-humped Caterpillar (Schizura concinna)
                                                            p311
17 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Black-blotched Schizura (Schizura leptinoides)                                          p312

1 Sep 2003, Kennesaw Mountain, Cobb County, GA
  Black-blotched Schizura (Schizura leptinoides)                                          p312

13 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Checkered-fringe Prominent (Schizura ipomoeae)                                           p314

24 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Checkered-fringe Prominent (Schizura ipomoeae)                                           p314

23 Sep 2006, taken at Chattahoochee Nature Center, Fulton Co, GA
  probable White-headed Prominent (Symmerista albifrons)                       p317

28 Oct 2004, Kennesaw Mountain, Cobb County, GA
Owlets, Cutworms, Underwings, and Kin: Noctuidae
  Afflicted Dagger Moth (Acronicta afflicta)323

18 Sep 2003, Kennesaw Mountain, Cobb County, GA
  Afflicted Dagger Moth (Acronicta afflicta)323

11 Sep 2005, Kennesaw Mountain, Cobb County, GA
  American Dagger Moth (Acronicta americana)                                          p324

28 Jun 2003, Ocmulgee River, Houston County, GA
  Cherry Dagger Moth (Acronicta hasta)  p327

8 Sep 2002, Kennesaw Mountain, Cobb County, GA
  Frosted Dagger Moth (Acronicta hastulifera)                               not in book

7 Oct 2006, McGraw-Ford WMA, Cherokee County, GA
  Yellow-haired Dagger Moth (Acronicta impleta)                                               p328

11 Sep 2002, Kennesaw Mountain, Cobb County, GA
  Yellow-haired Dagger Moth (Acronicta impleta)                                               p328

7 Jun 2004, Brasstown Creek, Towns County, GA
    Greater Oak Dagger Moth (Acronicta lobeliae)                                              p330

11 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Smartweed Caterpillar (Acronicta oblinita)
                                                             p332

12 Jun 2006, Cave Research Pond, Mammoth Cave National Park, Hart County, KY
  Streaked Dagger Moth (Acronicta lithospila)
                                                             p334
13 Sep 2003, Kennesaw Mountain, Cobb County, GA
  Ruddy Dagger Moth (Acronicta rubricoma)
                                                              p334
5 Sep 2005, Kennesaw Mountain, Cobb County, GA
Note: Several species of Acronicta Dagger moths are incredibly similar and cannot be told with certainty unless the larvae are reared to adulthood. Species in this group A. albarufa, exilis, haesitata, increta, modica, ovata, and tristis.
  Ovate Dagger Moth (Acronicta ovata) p336
(near, see comments above)
12 Sep 2005, Kennesaw Mountain, Cobb County, GA
Henry's Marsh Moth (Simyra henrici)  p338

12 Oct 2002, Beachton Pond, Grady County, GA
Panopoda sp, probably Red-lined Panopoda (Panopoda rufimargo)                      p349

17 Sep 2005, Kennesaw Mountain, Cobb County, GA
Undetermined catocaline.                         p360

3 Nov 2004, Little River, Echols County, GA
  Moonseed Moth (Plusiodonta compressipalpis)                                p369

1 Sep 2002, Kennesaw Mountain, Cobb County, GA
  Moonseed Moth (Plusiodonta compressipalpis)                                p369

13 Sep 2003, Kennesaw Mountain, Cobb County, GA
  Eight-spotted Forester (Alypia octomaculata) 
                                                              p382
Note in bottom image it is defensively vomiting.

15 May 2006, High Falls State Park, Monroe County, GA
  Camphorweed Cucillia (Cucullia alfarata)
                                                              p390

1 Sep 2002, Kennesaw Mountain, Cobb County, GA
  Confused Woodgrain (Morrisonia confusa)
                                                              p423

12 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Turbulent Phosphila (Phosphila turbulenta)
                                                               p427

27 Sep 2006, Kennesaw Mountain, Cobb County, GA
Gray Half-Spot Moth (Nedra ramosula)
                                                   not in book

4 Oct 2002, Laurens County, GA
  Fall Armyworm (Spodoptera frugiperda)
                                                              p432  

3 Nov 2004, Little River, Echols County, GA
Southern Armyworm (Spodoptera eridania)  

armyworms, p432-3, this species not in book

17 Oct 2003, Reed Bingham State Park, Cook County, GA
  Yellow-striped Armyworm (Spodoptera ornithogalli)                                          p433

10 Oct 2002, Kennesaw Mountain, Cobb County, GA
  Yellow-striped Armyworm (Spodoptera ornithogalli)                                          p433

5 Sep 2005, Kennesaw Mountain, Cobb County, GA
Pantheas and Yellowhorns: Pantheidae
The Laugher (Charadra deridens)         p439

16 Oct 2003, Kennesaw Mountain, Cobb County, GA
The Laugher (Charadra deridens)         p439

1 Oct 2005, Kennesaw Mountain, Cobb County, GA
 
Tussock Caterpillars: Lymantriidae
  Variable Tussock Moth (Dasychira vagans)
                                                            p444
24 Jul 2003, Oakmulgee WMA, Bibb County, AL
  Streaked Tussock Moth (Dasychira obliquata)                                              p445

19 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Definite Tussock Moth (Orgyia definita) p449

25 May 2004, Kennesaw Mountain, Cobb County, GA
White-marked Tussock Moth (Orgyia leucostigma)                                      p450

28 Jun 2003, Ocmulgee River, Houston County, GA
White-marked Tussock Moth (Orgyia leucostigma)                                      p450

4 Oct 2003, Kennesaw Mountain, Cobb County, GA
White-marked Tussock Moth (Orgyia leucostigma)                                      p450

15 May 2006, High Falls State Park, Monroe County, GA
Tiger, Lichen, and Wasp Moths: Arctiidae
  Wooly Bear (Pyrrharctia isabella)    p462

29 Dec 2003, Union County, GA
  probably Wooly Bear (Pyrrharctia isabella)
                                                               p462

19 Sep 2005, Kennesaw Mountain, Cobb County, GA
  Yellow Bear (Virginian Tiger Moth) (Spilosoma virginica)              &nb