AMERICAN IHI'TKKA. 



357 



TABLE OF SPECIES. 



I. Dorsum of thorax yellow or reddish yellow '-■ 



Dorsum of thorax dark brown or black ir '- 



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

 above the?broclinate ones, which are small and all of equal size.' insect 



wholly velh.w, with black spots on the abdomen epeirae Brues. 



Front of the usual form, and not lacking any of the median bristles, 3. 



3. Scutellum with four equally strong marginal bristles I. 



Sen I ell um with only two distinct bristles 8. 



1. 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 nigriceps Lw. var. 



5. Head, antenna-, and front, except ocellar tubercle, yellow 6. 



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



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



iiigri^epw Lw. 



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



pictil Lelim. 



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



curved •' ~ ■ 



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



cilia moderate aurea 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. 



3. ( Jostal 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 fungicola Coq. 



Halteres yellow fuugicola Coq. var. 



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



to the tip of the third vein &?*/..yt>kv Ilava 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 reclinate lateral bristles on each side 13. 



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

 ate one on each side atlailtica sp. nov. 



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



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

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

 ^—^J^aliuej J*^ 



14. T'ip of first vein one and one-half times as far from the humeral vein as from 



the tip of the third vein Intea Meig. 



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



