110 Illi>tois State Lahoratory of Natural History. 



15 (1). Antepenultimate article of right antenna with hook- 



like process at tip. 



16 (27). Process on antepenultimate article as long as or 



longer than penultimate article. 



17 (20). Process curved. 



18 (19). Inner ramus of right leg alone 2-segmente(l, extend- 



ing almost to middle of second segment of outer ramus. 

 Marginal spine below middle, near distal angle, 

 smooth, about half as long as segment. Terminal hook 

 fully as long as the two preceding segments and the 

 second basal segment taken together. Second basal 

 segment not dilated. Left leg reaching about to middle 

 of first segment of outer ramus of right leg ; inner 

 ramus barely reaching middle of last segment of outer 

 ramus. fraitclscanus. 



19 (18). Inner ramus of both legs 2-segmented. Marginal 



spine below middle, near apical angle ; hairy, almost as 

 long as segment. Terminal hook longer than the two 

 preceding segments, but not as long as those and the 

 second basal segment taken together. Second basal 

 segment dilated into rugose lamella. Inner ramus of 

 right leg extending about to middle of second segment 

 of outer ramus. Left leg extending about to middle of 

 second segment of outer ramus of right leg ; inner 

 ramus extending beyond middle of last segment of 

 outer ramus. ciseni. 



20 (17). Process straight. 



21 (22). Process sharply pointed. Marginal spine below mid- 



dle, about half as long as segment. Terminal hook 

 longer than the two preceding segments. Inner ramus 

 of right leg extending a little beyond end of first seg- 

 ment of outer ramus. Left leg reaching slightly beyond 

 end of first segment of outer ramus of right leg ; last 

 segment of outer ramus with hairy cushion on inner 

 margin ; inner ramus extending almost to middle of 

 last segment of outer ramus. sJiosJione. 



22 (21). Process blunt or swollen at tip. 



