DIPTERA OF BAJA CALIFORNIA. 597 



the antennae, those of the male being slightly darker, but 

 the first two joints of S antennae are no shorter than those 

 of female. I therefore believe that the S specimen de- 

 scribed by Williston under this name belongs to another 

 species. Williston does not mention the color of the scu- 

 tellum, which is black. The males have thorax blacker, 

 and more black on median portions of first two abdominal 

 segments. 



11. Therioplectes comastes Will. Rancho Viejo, 

 Baja California (Haines). April. Three females. Baja 

 Purisima, B. C, April. One ? . I refer these to this 

 species rather than to T. -phcBuops O. S., because they 

 have the antennae largely reddish. There is no trace of 

 cloud on the furcation of third vein. Two specimens have 

 the red of sides of abdomen much more extensive than 

 have the others. The first two antennal joints and base 

 of third are reddish. Length, about 15 mm. 



12. Therioplectes ph^nops O. Sack. California 

 (probably near San Francisco). Six females and one 

 male. Antennte wholly black. In the male the median 

 black stripe on abdomen is not so jagged but more even 

 on the edge, and the rufous does not extend on the fourth 

 segment. One of the females agrees with it in this re- 

 spect. Wings with a hardly perceptible trace of a brown 

 cloud on furcation of third vein. Length, 13-14 mm. 

 One of the females shows a peculiar deformity of the ab- 

 dominal segments. 



13. Tabanus ^grotus O. S, Sierra county, Cal. 

 One female, length, 21 mm., I refer to this species. 



14. Tabanus lineola Fab. California (probably 

 near San Francisco). One female. 



ElTaste,B.C. (Eisen). Two?. September. Length, 

 11^ to 14 mm. 



