18 H. C. HUCKETT 



j; 



Mid and hind tarsi and mid tibia without such bristling; hind pulvilli equal in size to, ^' 

 or smaller than, those of mid or fore legs - 10 ' 



10. Hind tibia with an antero- and a posteroventral apical bristle _. 11 



Hind tibia with only an anteroventral apica] biistle, the position for the posterior bristle 



being filled by a series of fine spinuJes 1" 



11. All femora clothed with long, dense, shaggy,- hairs; posterior notopleural bristle short, 



about half length of anterior notopleural bristle graridiviUosus sp. nov. 



All femora clothed with normal short setuiae; posterior notopleural bristle about three- 

 quarters length of anterior bristle 12 



12. Hind femur with a row of short anteroventral bristles, in length not exceeding the width 



of the femur where they are situated; arista bare or minutely pubescent 13 



Hind femur with a row of long anteroventral bristles, in length exceeding the width of 

 the femur where they are situated; arista distinctly pubescent 14 



13. Eyes separated at narrowest part by a distance equal to three times that between posterior 



ocelli; third antennal segment twice as long as broad; cross-veins distinctly clouded. 



megacephala !Mall. 



Eyes separated at narrowest part by a distance equal to that between posterior ocelli; 



third antennal segment nearly as broad as long; cross-veins with only traces of clouding. 



arnolitra sp. nov. 



14. Pra short, less than half length of the following bristle; hj-popj'gium polished, piceous, 



shining; wings clear, cross-veins clouded pullula Zett. 



Pra long, two-thirds length of the following bristle; hypopygium poUinose; wings yellow- 

 ish, cross-veins clear 15 



15. Blackish species; parafacials and cheeks, in profile, black velvety; Ri ftised with costa at 



a point beyond (distad; that opposite r-rn cross-vein 'piloseta Mall, 



Grajish species; parafacials and cheeks, in profile, grayish pruinose, with reddish and 

 dark reflections; i?i fused with costa at a point opposite r-m cross-vein 16 



16. Abdomen with golden pollen; a narrow, brownish, dorsocentral ^itta inoTn<ita Stein 



Abdomen with gxaj-ish poUen; dorsocentral ^itta composed of broad, darkish, subtri- 



angular fasciae setigera Joh . 



17. ilid tibia with a median anteroventral bristle 18 



^lid tibia without an anteroventral bristle 19 



18. Abdomen densely gra^-ish poUinose; a distinct black dorsocentral ^itta; hj^jopj^gium 



piceous, polished, shining latipemiis Zett. 



Abdomen shining, not poUinose; dorsocentral ^itta indistinct sepia Meig. 



19. ELind tibia with a row of short, closely set, setulose hairs or setuiae on anterior and 



posterior surfaces 20 



Hind tibia with a row or series of hairs or setuiae on posterior surface only 22 



20. Graj-iah species, vrith whitish poUen; wings white; abdomen with faint traces of a dorso- 



central %-itta; tibiae sHghtly reddish albula Fall, 



Blackish species; wings grayish, hyaKne; abdomen with a black dorsocentral Adtta and 

 incisures; tibiae entirely blackish 21 



21. Hind femur distinctly curved, with a short distal series of weak anteroventral bristles; 



hind tibiae with three or more antero- and posterodorsal bristles besides the normal 



apical setae curvipes Mall . 



Hind femux straight, with a close series of short, stout, uniform bristles along antero- 

 ventral surface; hind tibia with onij' one posterodorsal, one preapical dorsal, and one 

 posterior apical bristle unidorsali^ sp. nov . 



22. Fore tibia with a strong, curved, posteroventral apical bristle, the tip of which is usuaUv 



blunt '. 23 



Fore tibia with a pointed apical posteroventral bristle or setula, the tip of which is sharp. 26 



23. Hind tibia with a series of erect setulose hairs along entire length of posteroventral 



surface 24 



Hind tibia with only a partial series of setulose liairs, not extending entire length of 

 posteroventral surface .• 25 



