AMERICAN DIPTEKA. 357 



TABLE OF SPECIES. 



1. Dorsum of thorax yellow or reddish yellow "2. 



Dorsum of thorax dark brown or black 15. 



2. Front twice as high as broad, with no median bristles in the two rows next 



above the proclinate ones, which are small and all of equal size, insect 



wholly yellow, with black spots on the abdomen. .. -epeirse Brues. 



Front of the usual form, ami not lacking any of the median bristles I!. 



3. Scutellum with four equally strong marginal bristles 1. 



Scutellum with only two distinct bristles 8. ' 



4. Wings more or less yellowish, the veins yellowish brown 5. 



Wings hyaline, the veins blackish, costal vein not quite reaching to the mid- 

 dle of the wing iiigri«e|>s Lw. var. 



5. Head, antennae and front, except ocellar tubercle, yellow 6. 



Head, antennae and front black, second segment of abdomen without, or with 



scarcely evident lateral hairs, palpi longer and broader than usual. 



iiigrireps Lw. 

 li. Costal vein reaching to or slightly beyond the middle of the wing. 



piclil Lehm. 



Costal vein reaching far beyond the middle of the wing, fourth vein evenly 



curved 7. 



7. Abdomen in great part bright orange yellow, costal vein unusually long, its 



cilia moderate a urea. Aldrich. 



Abdomen almost entirely black, segments each with very narrow pale border 

 and more or less yellowish median portions, costal vein not so long, 

 its cilia rather short scalaris Lw. 



8. Costal vein reaching to the middle of the wing or beyond 11. 



Costal vein short, not reaching to the middle of the wing 9. 



9. Proclinate bristles small or wanting, hind tarsi black, the hind metatarsus of 



the female thickened fasciata Fall. 



Proclinate bristles well developed, hind tarsi yellow, the hind metatarsus 

 not thickened in the female 10. 



10. Halteres brown or black ft'ungicola Coq. 



Halteres yellow. ... fungicola Coq. var. 



11. Costal vein with very short cilia, tip of first vein as near to humeral vein as 



to the tip of the third vein (lava Fall. 



Cilia of costa not quite so short, segments of abdomen each with lat- 

 eral black triangular spots which sometimes fuse into bands. 



flava Fall. var. (?) 

 Costal vein with rather long cilia 12. 



12. Frontal cheatotaxy as usual, lower edge of front with four proclinate median 



and two recliuate lateral bristles on each side 13. 



Lower edge of front with four proclinate median bristles and only one recliu- 

 ate one on each side atlaiitiea sp. nov. 



13. Fifth and sixth veins convergent for basal half, then strongly divergent, 



seventh vein very close to the wing margin, wings brown, .ouscura. 



Fifth and sixth veins gradually divergent for their whole length, wings 



hyaline .14 



14. Tip of first vein one and one-half times as far from the humeral vein as from 



the tip of the third vein lutea Meig. 



TRANS. AM. ENT. SOC, XXIX. NOVEMBER, 1903. 



