190 U. S. NATIONAL MUSEUM BULLETIN 209 



divided into four species groups as noted in the keys and as described 

 at the beginning of each of the groups. 



Keys to the Nearctic species of the subgenus Ageniella 



MALES 



(Males of grisea, pallida, evansi, and submetallica are unknown; the 

 first two should run to couplet 2, and the last two to couplet 8.) 



1. Tibial spurs of the front and middle legs whitish, those of the hind legs 



blackish, partita group 2 



Tibial spurs of all legs blackish 4 



2. Middle and hind femora and first three tergites rufous or largely so; longest 



spur of hind tibia about 0.6 as long as its basitarsus . . 1. partita Banks 

 Middle and hind femora and first three tergites blackish 3 



3. Exposed portion of subgenital plate about 1.3 as long as wide; longer spur of 



hind tibia about 0.65 as wide as the hind basitarsus; seventh tergite light 

 brown; apical hairless margin of clypeus rather wide. 



4. Seminole, new species 



Exposed portion of subgenital plate about 2.0 as long as wide; longer spur of 



hind tibia about 0.7 as wide as the hind basitarsus; seventh tergite brown 



with a large white spot; apical hairless margin of clypeus not wider than 



usual 5. mintaka Brimley 



4. Brush on inner side of hind tibia with a subapical interruption; frons nearly 



always with an obscure ferruginous spot next to the upper part of eye. 



ACCEPTA GROUP 5 



Brush on inner side of hind tibia continuous to the apex though usually nar- 

 rowed subapically; frons without a ferruginous spot next to the upper part 

 of the eye 7 



5. Hind femur rufous 17. accepta (Cresson) 



Hind femur blackish 6 



6. Flagellum beneath blackish brown, its bristles large enough to be conspicuous 



among the fine erect sense hairs 15. conflicta Banks 



Flagellum beneath fulvous or strongly tinged with fulvous, its bristles rather 

 short and weak, not conspicuous among the fine erect sense hairs. 



16. blaisdelli (Fox) 



7. Body, head, and legs ferruginous; wings dark brown; external longitudinal 



basal carina on fore coxa strongly curved and ending at about its basal 0.3; 

 last tarsal segment with bristles beneath, coronata group. 



14. coronata Banks 



Body, head, and legs blackish; wings subhyaline, the forewing infuscate 



apically, or sometimes entirely blackish; external longitudinal basal carina 



on fore coxa weakly curved and ending near or beyond the midlength of the 



coxa; last tarsal segment without bristles beneath, cupida group. . . 8 



8. Subgenital plate with erect hairs that are at least as long as the width of the 



plate 9 



Subgenital plate without erect hairs 10 



9. Erect hairs on subgenital plate scattered over its surface, straight with their 



apical 0.25 bent 12. norata Banks 



Erect hairs on subgenital plate in a row around its edge, evenly and strongly 

 curved inward, plus a median row or band of shorter ascending hairs. 



13. neglecta Banks 



