AMERICAN DIPTERA. 207 



4. Third antennal joint oval ; hind tarsi and metatarsi with dense brash of yel- 



low hairs on outer side nitida sp. nov. 



Third antenna! joint elongate ; hind legs with no brush or with a small one of 

 orange hairs iiie«let era sp. nov. , 



5. Yellow or reddish yellow; fourth abdominal segment black. 



flavida Willistou. ^ 

 Thoi-ax black, abdomen fuscous to black 6. 



6. Third and 4th longitudinals widely divergent; species less than li mm. long....?. 

 Third and fourth longitudinals at most subparallel, larger 8. 



7. Pile of thorax yellow; antennae fuscous ; halteres fuscous. 



luiuiifa Willistou. 

 Pile of thorax black ; antenuse black ; halteres whitish, .divergeiis Loew. 



8. Halteres infuscated 9- 



Halteres white H- 



9. Posterior basal cell but little longer than anterior 10. 



Second basal cell two times first; costa not thickened- .laiipeiinis sp. nov- 



10. Abdomen fuscous, shining ; antennae yellowish ; pleurae yellowish ; pleurae 



yellowish; wings darker at base; legs light yellow. 



pubesceiiis Loew. 

 Abdomen mostly opaque black ; antennae infuscated ; pleurae black ; wings 

 uniform ; legs darker ; costa thickened between first and second veins ; 

 marginal cell at tip of first vein one half the width of submarginal ; 

 third and fourth longitudinals ending close together; wings with 

 brownish tinge apicis Williston. 



11. Legs pure luteous 14- 



Posterior femora dark in part 12- 



12. Posterior femora dark at apex, light at base; coxae yellowish ; hind metatarsi 



darker than other joints. '^ 



Posterior femora reddish at tip, black at base; coxae black; hairs of thorax 



intermixed with black ; third and fourth veins subparallel ; tarsi 



darker towards tip uuipila Loew. 



13. Stout ; 3d aud 4th longitudinals converging femoralis Wh. et M. 



Less robust; 3d vein straight septentrionalis sp. nov. 



14. Veins fuscous ; posterior basal never as much as twice as long as anterior ; 3d 



vein almost straight ; hind metatarsi infuscated 15. 



Veins faint; posterior basal about twice as long as anterior ; 3d vein with a 

 subapical anterior curve ; metatarsi not dark, .spectabilis sp. nov. 



15. Third and fourth longitudinals subparallel; hind tibiae simple; antennae 



black ; palpi lutescent gilvipes Loew. 



First posterior cell a little narrowed in the margin ; hind tibiae with a short 

 spur; antennaj aud palpi infuscated xaiitliopoda Williston. 



Drapetis nitida sp. nov. (Figs. 10, 14, 21). 

 Length 2-2.5 mm., wings same. Wholly shining black. Eyes contiguous 

 below and narrowly above antennae. Front not. broad, triangular. Last an- 

 tennal joint nearly oval, little longer than deep. Occiput not pruinose. Body 

 with short sparse hairs, besides the black macrochaetae. Scutelluni with two long 

 bristles. Halteres whitish. Abdomen of male generally blunt, of female gener- 

 ally pointed, segments of subequal length ; hypopygiura small, shining, legs in 



TKANS. AM. ENT. SOC, XXVIII. JULY, 1902. 



