1911] Study of Caterpillars of Sphingidae 265 



19. Setae i, ii and iii of the labrum on a level; labral notch very shallow, abdo- 

 men cylindrical and rather slender 20 



19. Setae i higher than ii and iii, ii usually decidedly higher than iii 21 



20. Metathorax swollen, supraanal not noticeably armed Erynnyis 



20. Cylindrical, supraanal with two large tubercles Pseudosphinx 



21. Horn reduced to a granule or replaced by an eyespot; metathorax strongly 



swollen; head full as wide as high and squarish Pholus 



21. Horn present in all forms with swollen body, swelling rather belonging to the 



first segment of the abdomen than to the thorax; head rounded, or if 

 squarish, full as high as wide 22 



22. Horn wanting (Deilephila vespertilio) 



22. Horn replaced by an eyespot 23 



22. Horn conical well developed 24 



23. Head very rough in last stage, horn very slender in middle stages, replaced 



by a high tubercle in the next to last Sphecodina 



23. Head nearly smooth in the last stage; horn stout in penultimate 



Proserpinus (in part) 



24. Horn blunt and cylindrical; body marked with a large subdorsal eyespot on 



the thorax, and with well defined distant annulations, beginning with 

 the second abdominal segment (Daphnis) 



24. Horn acute; no eyespot on side of thorax 25 



26. Body more or less swollen on first segment of abdomen, thence tapering to 



the head 30 



25. Body not swollen 26 



26. Head and general surface of body distinctly but sparsely tuberculate, the 



seta; rising from the apex of the tubercles; cervical and anal shields 

 rougher than the rest of the body 27 



26. Body smooth, head rarely with very slight tubercles, from the slope of which 



the setse rise 28 



27. Tubercles only visible under a lens (Macroglossa) 



27. Head and cervical shield appearing rough to the naked eye Hemaris 



28. Notch of labrum hardly 1-3 its height; seta; i and ii spaced about in the ratio 



2:3; vi only 1-3 way up from the apex of the lobe toward ii and much nearer 

 the middle line Deilephila 



28. Notch of labrum deeper, setae i and ii only about half as far apart as the seta; 



ii are from each other; vi nearer to ii than to the apex of the lobes. . . .29 



29. Front about half as high as height of epicrania; without normal oblique stripes 



(with reversed oblique spots) Proserpinus (in part) 



29. Front smaller; with seven normal obliques 14 



30. Horn not so long as height of head 31 



30. Horn very slender. ". (Hippotion) 



30. Horn normal 32 



31. Head very finely granular, appearing under low power smooth and dull 



(Pergesa) 



31. Head distinctly vermiculate Amphion 



32. Head sparsely tuberculate 33 



32. Head smooth and dull under low power, granular under high power, with 



smooth areas about the setae 34 



33. Body slightly swollen, spiracles pale with two black bars Deidamia 



33. Body much swollen, spiracles dark with a white dot at each end 



Darapsa, Ampeloeca, (Clarina) 



34. Front higher than wide (Theretra) 



34. Front wider than high Xylophanes 



Sphinx. (Hyloicus in part). Head slightly tapering toward 

 the top, or with sides rounded out (S. driipiferarum), with 

 irregular vermiculate grooving; the setae rising as often from 

 the grooves as from the elevated portions. Front about f 

 height of head, with lobes at the lower outer angles well marked 



