314 THE UNIVERSITY SCIENCE BULLETIN. 



A. Large, heavy bodied species — concluded. 



CC. Uncus broader, with broadly rounded apex. 



D. Species light, not strongly marked with black; 

 apex of wings strongly infuscated. superba. 

 DD. Species dark, strongly marked with black; apex o^ 

 wings slightly infuscated. 

 E. Hind margin of pronotum or collar greenish. 

 F. Larger species, averaging 30 mm. or 

 over in length, and with a distinct lon- 

 gitudinal black band on under side of 

 the abdomen. 

 G. Margin of fore wings not bent; 

 opercula broad, broadly rounded 

 behind; males usually with atten- 

 uated pruinose stripe on dorsum 

 of third segment. pruinosa. 

 GG. Margin of fore wings suddenly 

 bent near the middle; opercula 

 narrowed apically and more angu- 

 late behind. linnet. 



FF. Smaller species, averaging about 25 mm. 

 in length and without a distinct longi- 

 tudinal black band on the under side of 

 the abdomen. aurifera 



EE. Hind margin of pronotum or collar blackish. 



lyricen. 

 BB. Uncus usually about as wide as long, usually triangular, but 

 with the apex often truncate. 



C. Wings long and slender; a large ferrugineous and black 

 species. resonans. 



CC. Wings broader; species greenish and black. 



D. Very large species, expanding over 110 mm. Flaps 

 of wings gray. auletes 



DD. Smaller species, seldom expanding 110 mm. Flaps 

 of wings usually with yellowish or orange tinge. 

 E. Fore wings with cross veins between Ri and 

 R44-. and between the latter and Mi distinctly 

 darkened. Posterior margins of abdominal 

 terga not lighter. 

 F. Abdominal terga with a dorsal row of 

 pruinose spots; uncus somewhat tri- 

 angular, apex obtuse. dorsata. 

 FF. Abdominal terga without dorsal prui- 

 nose spots; uncus broadly truncate api- 

 cally. resh. 

 EE. Fore wings with cross veins between R, and 

 R4^.-, and between the latter and Mi not at all 

 or slightly darkened. Posterior margin of 

 abdominal terga lighter. 

 F. Head bi'oad, wings rather narrow; ab- 

 dominal terga without dorsal pruinose 

 spots and not strongly pruinose later- 

 ally, marginalis 

 FF. Head narrower, wings broader; ab- 

 dominal terga with dorsal row of prui- 

 nose spots and strongly pruinose later- 

 ally, dealbata. 



