137 



f. 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 Chlaeno gramma Smith. 



ff. 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. 



Sphinx Linnaeus, 

 bb. Maxillae of the usual type without a maxillary loop or so-called 

 ' ' raised tongue-case. ' ' 

 c. Cephalic margin of abdominal segments 5-7 always with one 

 deep pocket-like furrow over each spiracle, with or without a 

 shallow ectal one. 

 d. With one deep pocket-like furrow over each spiracle on abdom- 

 inal segments 5-7. 

 e. Surface of body spinose; cremaster broad and truncate, the 

 caudo-lateral angles usually produced into sharp points; 

 caudal abdominal segments flattened on the ventral sur- 

 face, and with distinctly carinate lateral margins. 



Cressonia Grote and Kobinson. 

 ee. Surface of body never spinose ; cremaster pointed, trian- 

 gular in outline, caudal abdominal segments never flat- 

 tened on the ventral surface, nor with distinctly carinate 

 lateral margins, 

 f. Maxillae normally reaching to the caudal margin of the 

 wings, slightly less in some individuals; mesothoracic 

 wings never meeting on the meson caudad of the max- 

 illae ; scar of the caudal horn never present on the dor- 

 sum of the eighth abdominal segment. . .Lapara Walker. 

 ff. Maxillae never more than five sevenths the length of the 

 wings ; mesothoracic wings always meeting on the meson 

 caudad of the maxillae; scar of the caudal horn always 

 present on the dorsum of the eighth abdominal segment. 



Daremma Grote. 

 dd. W T ith one deep pocket-like ental furrow and a shallower ectal 

 one ; maxillae about two thirds the length of the wings. 



Ceratomia Harris, 

 cc. Cephalic margin of abdominal segments 5-7 with three or four 

 more or less interrupted furrows over each spiracle, the sur- 

 face of the furrows often punctate like the remainder of the 

 cephalic margin, 

 d. Maxillae never half the length of the wings; average length 

 of maxillae at meson 5-6 mm., sometimes 7 mm. in large speci- 

 mens; dorsal cephalic margin of abdominal segments 5-7 

 deeply punctate, the punctures adjacent to each other, giving 

 it a honeycombed appearance, the cephalic margin separated 



