408 Annals Entomological Society of America [Vol. XI, 



Key to the Genepa of Sphingidae. 



,. Spiracular furrows present .on three segments, that is, on abdominal seg- 

 ments 5-7 {A semanaphorae) 



b. Abdominal segments 5-7 with either one or two (occasionally a trace of 

 three) spiracular furrows, always with one deep pocket-like furrow (Fig. 

 2) and a shallower outer one; body always without spines and with a 



triangular cremaster {Acherontiinae) 



c. Maxillary loop present. 



d. Maxillary loop with its distal half recurved and touching the proximal 



portion (Fig. 2) Herse Oken. 



dd. Maxillary loop with its distal half never recurved, its distal end 



touching the body. 



e. Maxillary loop strongly arched from the surface of the body, the height 



of the arch always greater than the width of the loop in that region. 



f. Dorsum of abdominal segments 2-8 with a strongly rugose band on 



the cephalic third, similar to the triangular area on each side 



of the metathorax Cocytius Hbn. 



ff. Dorsum of abdominal segments 2-8 punctate; metathorax with a 

 strongly elevated smooth transverse ridge on each side. 



Protoparce Burm. 

 ee. Maxillary loop never strongly arched from the surface of the body, 

 the space between it and the surface never as great as the width 

 of the loop, usually closely applied to the ventral surface, 

 f. Two spiracular furrows present (Fig. 3). 



g. Spiracular furrows 5 mm. or more in transverse length, and 

 extending ventrad of the spiracle for a distance equal to the 

 length of the spiracle; maxillary loop never over 5 mm. in length. 



Chi ceno gramma Sm. 



gg. Spiracular furrows always less than 5 mm. in transverse length, 



seldom extending ventrad of the spiracle, if so, then for a 



distance less than the length of the spiracle; maxillary loop in 



most species over 5 mm. in length Sphinx L. 



ff. One spiracular furrow present — the deep inner one. 



g. Maxillary loop extending as far caudad as the distal ends of the 



prothoracic legs, and occasionally beyond them.-. .Atreus Grt. 



gg. Maxillary loop never extending as far caudad as the distal ends 



of the prothoracic legs Dolba Wlk. 



cc. No maxillary loop present. 



d. With two spiracular furrows Ceratomia Harr. 



dd. With one spiracular furrow, the deep inner one. 



e. Maxillae never more than five-sevenths the length of the wings; body 

 surface polished, the punctures on the abdomen distinct. 



Daremma Grt. 



ee. Maxillse normally more than five-sevenths the length of the wings; 



body surface dull, the punctures on the abdomen usually obscured' 



by the sculpturing Lapara Wlk. 



bb. Abdominal segments 5-7 either with three or four more or less interrupted 

 furrows over each spiracle, the surface of the furrows often punctate like 

 the remainder of the cephalic margin (Fig. 5) or with one deep furrow, 

 in which case the body is spinose and the cremaster truncate. 



{Amlnilicince) 

 c. Surface of body spinose; cremaster broad and truncate; one spiracular 



furrow present Cressonia G. & R. 



cc. Surface of body smooth; cremaster triangular and pointed: more than one 



spiracular furrow present. 



d. Maxillas never half the length of the wings, their length 5-7 mm.; length 



of pupa usually less than 40 mm., usually slender. . .Smerinthus Latr. 



dd. Maxillas half the length of the wings, their average length 10 mm., 



sometimes longer; length of pupa normally over 45 mm., very stout. 



Pachy sphinx R. & J. 



