394 THE NOBTH AMERICAN EMPID^—COQUILLETT. vol. xviik 



Genus HILARA, Meigen. 



ANALYTICAL KEY TO THE SPECIES OF HILARA. 



1. Thorax liliick 3 



Thorax, femora^ and lialteres yellow 2 



Thorax aud abdomen metallic green viridis (p. 395). 



2. Tar.si wholly brown, pile on inner side of nuddle tibi;e long testacea. 



Tarsi brown only at apex, elsewhere yellow, j)ile on inner side of middle 



tibia' short Udea. 



3. Femora black 10 



Femora yellowish 4 



4. Knob of lialteres yellowish 6 



Knob of halteres black 5 



5. AVings darker at apex than toward the base, scntellnm bearing six bristles; 



length, 5 mm umhrosa. 



Wings not darker at apex than elsewhere, scntellnm bearing only four 



bristles ; length, 3 mm (jrncilis. 



Wings gray ; length of body, 2 mm mUjraia. 



6. Abdomen wholly black 7 



Abdomen on basal half yellow, palpi yellow, stigma blackish brown basalis. 



7. Posterior legs and the stigma blackish pJeheja. 



Postei'ior legs largely or wholly yellow 8 



8. Palpi yellow, stigma blackish 9 



Palpi black, stigma obsolete iiuivroplera. 



9. Pile of thorax in rows, front metatarsi thickeued, ovate .scrkita. 



Pile not in rows, front metatarsi not thickened, anteuna^ of male eight times 



as long as the head joJutsoiti (p. 395). 



10. Knob of halteres black 12 



Knob of halteres yellowish, palpi black 11 



11. Stigma brownish black, knees yellow irivittala. 



Stigma obsolete, knees whitish lencoptera. 



12. Stigma brownish black 13 



Stigma obsolete, palpi black, front femora in both sexes very thick, knees, 



tips of front tibia' and their tarsi yellow femorata. 



13. Thorax grayish-black, never velvety 14 



Thorax aud head velvet black, scntellnm aud abdomen shining, palpi black, 



coxa> and legs wholly black veluiina. 



14. Abdomen shining or subshiuing 17 



Abdomen opaque, palpi, coxfe, and legs, excepting the knees, wholly black.. 15 



15. Front velvet black, wings blackish Iristis. 



Front grayish, not velvety ; wings hyaline or pale grayish 16 



16. Pile of abdomen largely yellowish, thorax marked with three blackish vitta- 



cuna (\t. 395). 

 Pile of abdomen black, thorax not vittate miicolor. 



17. Palpi yellow 19 



Palpi black, coxse and legs, excepting the knees, black IS 



18. Thorax shining, not vittate atra. 



Thorax opaque gray pollinose, marked with three black vitta' tniiiabiUs. 



19. Front coxa» and base of front femora yellow, wings pale grayish nigrivetiiris. 



Front coxa' aud base of femora black, wings hyaline *. hrevipilu. 



Hilar a Iransfiuja, Walker, is too imperfectly described to admit of 

 giving it a place in this table. 



