1911] Study of Caterpillars of Sphingidae 277 



FIELD KEY TO THE SPHINGID CATERPILLARS.* 

 OF THE EASTERN UNITED STATES. 



A. Horn completely wanting, head half higher than wide and triangular 



Lapara coniferarum and bombycoides 

 A. Eighth abdominal segment bears a little hard nodule (caterpillar brilliantly 



marked with black, white and red) Pholus fasciatus (vitis) 



A. Eighth abdominal segment with an eyespot, otherwise unarmed B 



A. Eighth abdominal segment with a horn, otherwise unarmed F 



A. Eighth abdominal segment with a horn, mesothorax sharply humped or tuber- 



culate Lintneria eremitus 



A. Eighth abdominal segment with a long horn, and thorax with four much short- 



er ones Ceratomia quadricornis 



B. Slanting white patches on the sides C 



B. Pale on the sides, obliquely mottled, eyespot white. Pholus labruscae (Fla.) 



B. Otherwise marked; eyespot dark-ringed 1 > 



C. White patches are full three times as long as broad Pholus achemon 



C. White patches are 2J^ times as long as broad Pholus pandorus 



D. Checkered contrastingly with red and green Proserpinus juanita 



D. No red E 



E. Eyespot ringed with jet-black Proserpinus flavofasciata 



E. Eyespot ringed with brown Sphecodina abbotii 



F. Slanting lines on the sides, sloping upward toward the rear G 



F. Slanting lines, if present, running in the opposite direction Y 



G. Slanting lines dark and more than seven, with a double set on the dorsum 



Amphion nessus 



G. A single slanting line running up to the horn Cocytius antaeus 



G. Numerous slanting lines, on the dorsum only Cocytius cluentlus 



G. Slanting lines indefinite in number or evanescent; spiracle marked with two 



vertical bars, caterpillar a little humped Deidamia inscriptum 



G. Slanting lines six or seven, and distant H 



H. Head rounded, with two pair of vertical dark stripes; on Convolvulaceae 



Herse cingulata 



H. Head mostly with one or no vertical dark stripes; on other plants 1 



I . Horn rudimentary Pachysphinx modesta 



I. Horn as long as head, or longer J 



J. Skin rough and granular, head triangular K 



J. Skin nearly smooth, but with the stripes marked with raised granulations. .O 



J. Skin smooth P 



K. Horn well defined and much longer than height of head. . Cressonia juglandis 

 K. Horn about as long as height of head, and not very distinct from body, 



straight L 



L. The oblique stripes irregularly shaded with red patches. . . Paonias astylus 

 L. One of two pairs of red spots alone, or with one or two much larger than the 



others Paonias myops 



L. With a number of equal red spots or with none M 



M. With none, horn normally blunt, or blueberry P. astylus 



M. Horn always acute N 



N. Horn pink, violet or blue Smerinthus cerisyi and jamaicensis 



N. Horn normally blue-green Paonias excaecatus 



N. Horn normally yellow-green, yellow on the sides Paonias myops 



O. Head broad and rounded, granulated Atreides plebeius 



O. Head high and tapering, nearly smooth Chlaenogramma jasminearum 



O. Head broad and tapering, nearly smooth 



Phlegethontius rusticus, and occasional specimens of Sphinx chersis, etc. 

 P. First segment of abdomen much swollen, subdorsal stripe well developed. .Q 

 P. Caterpillar nearly cylindrical, subdorsal stripe present on thorax only....S 

 Q. Subdorsal stripe complete Ampelophaga myron 



* See "Field Tables of Lepidoptera (1906) p. 69. 



