72 Journal New YopK Entomological Society, t^'o'- xxv. 



has a somewhat narrower black stripe on the abdomen than the average. 

 Length 12-15 mm. 



Type.—U. S. N. M., Cat. No. 20741. 



Habitat. — Redlands, Cal. Several specimens, all collected in Sep- 

 tember. The species is ver,y common in this region. 



Anthrax effrena Coq. (fig. 7). 



"Anthrax effrena Coq., Trans. Amer. Ent. Soc, XIV, 182. 



Differs from alplia only as follows: Proboscis not projecting beyond epis- 

 toma. Wings wholly dark brown, except a large hyaline spot near the middle 

 of discal cell encroaching on third posterior cell, a less distinct spot in the 

 middle of the fourth posterior cell and the entire apex of the second submarg- 

 inal cell ; basal half of the third vein and basal two thirds of the sixth vein 

 light yellow. Length 12 mm." 



"Arizona. A single specimen (Williston)." 



This species varies from 9-17 mm. in length. All of the material 

 in the National Museum is from Arizona. One small specimen (9 

 mm. in length) is probably immature. The wing color is pale and 

 indefinite. The abdominal markings seem to vary considerably. 

 The legs are yellowish red. The first two joints of the antennae are 

 yellowish, the third joint black (fig. 20). Coquillett compared this 

 species with alpha but could not have had a correctly determined 

 specimen of alpha. The two species do not resemble each other to 

 any extent. 



Anthrax alpha O. S. 



Anthrax alpha O. S., West. Dipt. 



Osten Sacken gives a very good discription of this species in his 

 Western Diptera. "Coloring of the wings very like that of A. hal- 

 cyon; second submarginal cell bisected by a cross-vein; in the third 

 posterior, a long stump of a vein. Length 12-14 ^nr"- 



" Front, face, and cheeks beset, the former with short black, the two 

 latter with scarce yellow pile; venter black; proboscis not projecting; antennae 

 black, first joint reddish, with black pile. Thorax grayish black, clothed 

 with pile, which is pale fulvous above and white on the pectus and lower part 

 of the pleurae. Scutellum reddish, black at base ; ground color of the abdomen 

 is grayish black ; in rubbed-off specimens only a little red is perceptible on the 

 sides of the second and third segments ; in well preserved specimens, the 

 ground color is entirely concealed under a dense, appressed tomentum which 

 is whitish gray on the anterior and brownish fulvous on the posterior half of 

 the segments ; an ill-defined blackish spot in the middle of each segment ; the 



