272 Annals Entomological Society of America [Vol. IV, 



and ii only half as far apart as the two setas i are from each 

 other; vi nearer to ii than to the tip of the lobes. Body with the 

 first abdominal segment, much swollen and bearing an eyespot, 

 with or without less prominent ones on the following segments; 

 thorax lacking the mottling characteristic of the abdomen in the 

 darker forms; horn regularly conical; skin smooth. 



Subgenus Theretra. Horn well developed; large eyespot 

 normal, followed by a series of simpler ones in a subdorsal 

 stripe; pattern of abdomen wanting from the first segment, as 

 in some Philampclina; body with dark obliques slanting up 

 and back. T. alecto. 



Subgenus Xylophanes. Horn and eyespots as in Theretra. 

 Front distinctly wider than high; labral setae i and ii a trace 

 farther apart and nearly on a level; notch broad and only § 

 height of labrum; second joint of antenna only half longer than 

 the first. Perhaps a little near to Dci/eplu'la than the others 

 are. X. tersa. 



Subgenus Pergesa. Horn very short and sharply down- 

 curved; the first eyespot only is present, and it has a black 

 shade below. Seta; i of labrum much higher than ii, and they 

 are spaced as in Theretra, that is, in the ratio 1:2. Notch 

 nearly half height of labrum; antennae with second segment 

 twice as long as first. 



Subgenus Ilippotion. Similar to Pergesa, but with the horn 

 long and slender (fig. 15). 



PIiolns (Philampelus). Horn reduced to the merest rudi- 

 ment in vitis, replaced by an eyespot which bears a pale cres- 

 cent in its posterior part, in pandoras, achemon and labruscce; 

 said to be completely wanting in a Texan species. Metathorax 

 much swollen, first segment of abdomen distinctly smaller. 

 The front of the body is completely retractile in P. achemon 

 and pandoras, apparently less so in vitis and labrnscae. Supra- 

 anal broad, not specially armed. Head fully as wide as high, 

 squarish; front higher than wide, and nearly half its height. 

 Setas i, ii and vi of labrum especially close together. 



Ainpeloeca. ' {Darapsa, Everyx, Ampelophaga) . Head 

 rounded, with widely separated small tubercles, similar to 

 fig. 1G, but higher; front more than = its height, decidedly 

 higher than wide, also tuberculate. Labrum with a fairly deep 

 notch; setas as in Chcerocampa. Body decidedly swollen at first 

 segment of abdomen, but not enough to withdraw the head. 



