igio] A Structural Study of Some Caterpillars 109 



Head decidedly tapering upward, upper part of front narro\Y, horn 

 tapering regularly; otherwise about as in Sphinx. 

 Example Dolba hylaeus Figs. 39-41. 

 Labrum much less deeply notched, head intermediate between that 

 of gordius and hylaeus; front hardly more sinuous than in Deilephila. 

 Horn strongly curved and regularly tapering. 

 Examples Phlegethontius celeus. 

 P. sexta. Fig. 51. 



Ambulicinae: Head much higher than wide and tapering much 

 to the vertex; epicrania with only three or four setae in an area the 

 size of the front, set on decided tubercles; front with margins sinuous 

 as in the preceding subfamily, quite small proportionately; Labrum 

 very deeply notched. Skin rough, horn always conical, variable in 

 size. 



Example Paonias myops Figs. 42-44. 



Philampelinae: Head squarish; front small in proportion to 

 head, and higher than wide ; with much straighter margins than in the 

 preceding groups; posterior ocellus low, as near to lower ocellus as to 

 the fourth one; labrum deeply notched; a subspiracular ridge on the 

 anterior segments, disturbing the incisure between thorax and abdo- 

 men; skin always smooth, horn variable. 



Head wider than high, third ocellus much enlarged; caudal horn 

 shorter than height of head ; supraanal plate nearly an equilateral triangle, 

 and acute at tip. 



Example Amphion nessus. Figs. 48 and .53. 



Head higher than wide, with the sides nearly parallel; third ocellus 

 much enlarged, caudal horn nearly normal; supraanal plate as narrow 

 as in the last, but with the tip rounded off. 

 Example Darapsa myron. 



Head higher than wide, the sides converging somewhat toward the 

 vertex, caudal horn replaced by a low button; supraanal plate broad 

 and rounded. 



Example Pholus pandorus. 



CHfEROCAMPiN^: Head decidedly wider than high, the upper 

 part nearly spherical; epicranial seta ii distinct; posterior ocellus 

 high, half farther from lower than from fourth ocellus; front wider 

 than high, its width equal to about half height of head, its margins 

 nearly straight, as in the last subfamily; clypeus quite narrow with 

 the setae close together as in the Sesiinae ; labrum with notch shallow ; 

 i and ii nearly in a straight line; Hi farther from the margin than iv, 

 vi not very far from the margin. This comes nearer than any of the 

 others to Pseudosphinx. 



Example Deilephila gallii Figs. 46 and 52. 



Apatelodes. 

 Secondary hair on epicrania, front, adfrontals, mandibles, maxillae, 

 labium and body, but not on distal parts of maxillae and labium or on 

 clypeus or labrum; tufted hair also on body. Front rather large, 

 the epicrania extending about its height above it, labrum with setae 

 vi quite distant from margin. Hi and v also not marginal. Secondary 

 setae of labium arranged in two diverging rows. Setae ai of labium 

 close together. Prolegs with hooks in a single band, alternately of 



