DIPTERA OF BAJA CALIFORNIA. 607 



received, in a second lot of material from the Academy, 

 ten additional specimens, all males, from San Jose del 

 Cabo. They vary from 17 to 22 mm. in length. The 

 whole body is yellowish pilose, and the macrochajtas are 

 wholly yellow except those of hind legs black. The tho- 

 rax is blackish in ground color, grayish pollinose, leaving 

 a median pair of geminate dark vhtae abbreviated behind, 

 and a widened tapering vitta on each side reaching scu- 

 tellum. Sometimes there is a faint trace of black on me- 

 dian anterior portion of third abdominal segment. The 

 hypopygium is uniformly short and much smaller than in 

 acfon . 



This species seems to mimic, in general appearance, 

 the large asilid with yellow abdomen described in this 

 paper as Proctacanthus zamon, which is very common in 

 the southern portions of Baja California. The resem- 

 blance is very striking. 



ACROCERID^. 



27. Pterodontia vix n. sp. 



Southern California. One specimen. Length, 5 mm.; 

 of wing, 5 mm. 



I do not believe that this can be Pt. misella O. Sack. 

 Williston states in his characterization of the family that 

 the eyes are contiguous in both sexes. Yet (in Trans. 

 Am. Ent. Soc.) he later states that he has speci- 

 mens of Pt. misella, which Osten Sacken says is very 

 like Pt. Jiavipes, differing only in size and the coloring 

 of the abdomen. Now, Macquart figures and describes 

 Pt. jiavipes as having a very widened head with widely 

 separated eyes, and the costal dilatation of the wing and 

 its venation are very different from what is found in the 

 present specimen. If Macquart's description of Pt. jiav- 

 ipes is correct, and he says he figures the type described 



2d Ser., Vol. IV. ( 40 ) April 8, 1895. 



