DIPTERA OF BAJA CALIFORNIA. 603 



hardly apparent. Each occupies the lateral anterior an- 

 gle of the dorsal sclerite of the segment. Hypopygium 

 is entirely blackish. Palpi brownish, clothed with yel- 

 lowish-white bristles. Venter yellowish. All the femora 

 blackish, but yellowish at tips, the hind pair more nar- 

 rowly so; tibiffi and tarsi wholly whitish yellow. 



The bristles of hind border of scutellum are clear yel- 

 lowish. Hypopygium is clothed with short yellowish 

 pile. Antennae are blackish or brown, third joint red- 

 dish. In both mellifex and acton, as well as xanthos, the 

 macrochceta; of antennce are yellow, while in efiscofus 

 they are blackish. 



24. Rhaphiomidas episcopus Osten Sacken (non 

 Coquillett). Baja California, September (Eisen). Two 

 specimens, 5 ? , San Jose del Cabo. 



Length, 20-21 mm., excluding antennae. After study- 

 ing Osten Sacken's description and Coquillett's notes, 

 with the material before me, I have no hesitation in say- 

 ing that Coquillett did not possess R. episcopits O. S., but 

 that the species which he so identified is a new species 

 which I describe below as R. mellifex. R. episcopus has 

 no yellow whatever on the abdomen in either sex. Co- 

 quillett's statements that the 6 of R. episcopus has the last 

 three abdominal segments destitute of black pile, and that 

 in both sexes each abdominal segment is bordered poste- 

 riorly with yellowish, show that he had R. mellifex under 

 observation. 



The male of R. episcopus has yellowish pile on the first 

 abdominal segment only (also on the thorax, occiput, 

 front, face, and front cox£e) ; the rest of the abdommal 

 segments, especially the last three even including the hy- 

 popygium at base, having black pile. The female has 

 segments one to four bordered with yellowish pile, less 

 conspicuous in the middle of fourth. AntenucC in both 



