AMERICAN DIPTERA. 207 



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



low hairs on outer side nitida sp. nov. 



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

 orange hairs medelera sp. nov. 



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



flavida Williston. 

 Thorax black, abdomen fuscous to black 6. 



6. Third and 4th longitudinals widely divergent ; species less than 1 J mm. long.. ..7. 

 Third and fourth longitudirfals at most subparallel, larger 8. 



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



miuiita Williston. 

 Pile of thorax black ; antennge black ; halteres whitish- .divergeiis Loew. 



8. Halteres infuscated • • 9. 



Halteres white 11. 



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



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



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



yellowish ; wings darker at base ; legs light yellow. 



pubescent Loew. 

 Abdomen mostly opaque black ; antennae infuscated ; pleuraj 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 ; hiud 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 iiiiipila Loew. 



13. Stout; 3d and 4th longitudinals converging feinoralis 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 ; hiud tihife with a short 

 spur; antennae and palpi infuscated xauthopoda Williston. 



Drapetis iiitida 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. Scutellum with two long 

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

 ally pointed, segments of subequal length ; hypopygium small, shining, legs iu 



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



