ISrORTH AMERICAN DJPTERA. 171 



the apex, claws of front tarsi well developed. Wings hyaline, costal cell yellow- 

 ish, proximal half of first hasal cell hrownish, a brown cloud in marginal cell 

 above base of first subniarginal cell, a brown cloud ou veins at bases of first sub- 

 margiual and first posterior cells, and sometimes on those at bases of second 

 submarginal and second, third and fourth posterior cells. Length 4-8 mm. 



California!, AVasliington Territory I T-sventy-four specimens. 



20. Aiithrstx lauta n. sp. — Differs from inaurata only as follows: Face but 

 little produced below; occiput (except in the middle above) with tomeutose ; a 

 curved crossband of white tomentum on thorax in front of the middle, reaching 

 to root of each wing; a crossband of white tomentum at bases of second and 

 third abdominal segments; no shining tomentum on the third and fourth seg- 

 ments in the male ; pile of hind part of abdomen wholly yellowish. Wings have 

 the first basal and base of marginal cell brownish. Length <! mm. 



California ! A single specimen. 



21. Anthrax agres^tis n. .sp.— Differs from ^H/nircf^a only as follows: Oc- 

 ciput white tomentose. Thorax with a curved white tomentose crossband in 

 front of the middle reaching to root of each wing. Abdomen with a white to- 

 mentose crossband at bases of the second and third segments; segments 4-6 shin- 

 ing golden tomentose in the male. Length 7-8 mm. 



California! Four specimens. 



22. Anthrax caniprestris n. sp.— Differs from inaurata only in having 

 no shining tomentum on the abdomen of the male, and in having a crossband of 

 black tomentum on base of fourth segment; there is sometimes a ci'ossbaud of 

 white tomentum on bases of second and third segments. Length 4-6 mm. 



California ! vSeven specimens. 



23. Anthrax atrata n. sp. (Syn. .?^. cedens Walk. !;— Wholly black, the 

 pile and tomentum also wholly black, except a few whitish pile on front end of 

 thorax; a deep fovea near centre of the front; first joint of antennje about 

 twice as long as the second, third joint very elongate-conical at its base, the 

 styliform portion scarcely one-half as long as the thickened basal part; face 

 slightly produced below; proboscis projects length of its labellie or less beyond 

 the epistoma. Front tibire provided with bristles, claws of front tarsi well de- 

 veloped. Wings hyaline at the apex, the base brownish-black, the outline of 

 this color extends from near apex of first vein to hind margin beyond apex of 

 fifth vein in third posterior cell, curving outward so as to include base of second 

 posterior cell ; a hyaline spot in bases of second basal and anal cells and near 

 apex of discal cell, besides sometimes a subhyaline spot in ba.ses of marginal, 

 discal and third posterior cells, centre of fourth posterior and axillary cells and 

 apex of each of the basal cells. Length 1.3-16 mm. 



California ! Twenty-seven specimens in September. 



24. Anthrax niiscella n. sp.— Black, lower part of front, face, first two 

 antennal joints, scutellum, except at base, sides and apex of abdomen, venter, 

 femora and tibiee reddish. Front and face yellowish tomentose and black pilose, 

 a deep fovea near centre of front; face retreating below ; proboscis not project- 

 ing beyond epistoma; occiput yellowish tomentose. Thorax with a bluish cast, 

 yellowish tomentose, dorsum black pilose, sides and front end yellowisli pilose, 



