150 The Ohio Journal of Science [Vol. XIX, No. 2, 



c. Median parts of segments so colored. 



d. Segments 3 (or 2) to 7 in part ferruginous with concolorous hair. . . . 



aimatis n. sp. 



dd. Segments 4-6 in part so colored gilva L. 



cc. Hind angles and margins or entire segments so colored. 



e. Hind angles and margins of segments 3-7 yellow ventralis Will. 



ee. All of segments 3-7 yellow; dense patch of yellow hair on posterior half 



of pronotum coquillettii n. sp. 



bb. Abdomen black in ground color, or if partly red, these areas not bearing 

 dense concolorous hair. 

 f. First 3 segments strongly contrasting with others either in color of 

 pile or integument. 

 g. First 3 segments black, others yellowish to reddish with sparse 



pubescence. (For key to varieties see page 162) felis OS. 



gg. Same coloration, but segments 4-7 with dense yellowish to reddish 

 pile, 

 h. Patch of whitish pile on posterior half of pronotum. . .trux n. sp. 



hh. Without such a patch carbonarius Snow 



ff. Color of first 3 segments not strongly contrasting with that of others. 



i. Legs reddish, body black, nearly bare sadales Walk. 



ii. Legs dark. 



j. With copious bright golden to ardent rufous pile over whole 

 dorsum of thorax and abdomen, 

 k. All hair of head including mystax reddish tawny, con- 

 colorous with that of remainder of body. . . .vultur OS. • 

 kk. Hair of head in part black. 



1. Male genitalia as in Figure 3 aktis n. sp. 



11. Male genitalia as in Figure 2 sericea Say 



jj. Pile of thoracic dorsum black, at least, at the sides in front, 

 n. Pale pile extending forward, at least to middle of 

 pronotum, forming a distinct narrow triangle. 



o. Male genitalia as in Figure 17 index n. sp. 



oo. Male genitalia as in Figure 18 ithypyga n. sp. 



nn. Pale pile not forming a distinct narrow triangle. 



p. Pale pile covering at least posterior half of 



pronotum jantis n. sp. 



pp. Pale pile covering less than half of pronotum 

 usually merely fringing posterior part, 

 q. Species with some dense yellowish to golden 

 pile on abdomen, 

 r. Slender species. 



s. Male genitalia as in Figure 16 



Scorpio n. sp. 



ss. Male genitalia as in Figure 21 



canis Will. var. disparella Banks. 



rr. Robust species. 



t. Tufts of hair in front of wings and hal- 



teres yellow vivax Will. 



tt. Tufts of hair in front of wings and hal- 



teres black ferox Will. 



qq. Species with no more than scattering yellow 

 hairs on abdomen. 

 u. Male genitalia as in Figure 19. . . 



sicula n. sp. 



uu. Male genitalia as in Figure 20. . . 



franciscana Bigot 



uuu. Male genitalia as in Figure 21. . . 



canis var. canis Will. 



uuuu. Male genitalia as in Figure 22. . . 



winnemana n. sp. 



