DIPTERA OF BAJA CALIFORNIA. 613 



oring of the two segments coalescing on each side into a 

 kidney-shaped marking. Fourth segment in female red- 

 dish-brown, with three blackish spots; in male reddish, 

 dark in middle, and pale on sides anteriorly. Hypopy- 

 gium brown. Venter of female broadly yellow on all 

 basal region, brown apically and slenderly on median 

 line; of male brown on base, yellow on each side, and 

 brown apically. Pubescence of abdomen whitish, longer 

 and more noticeable on fourth segment. Legs brown, 

 knees and bases of all the tibia? yellowish. Wings wholly 

 hyahne; stigma very dilute, appearing as a small pale 

 brown cloud, second vein regular. 



37. VoLUCELLA ESURiENS Fabr. San Jose del Cabo, 

 Baja California (Eisen). One male and one female. 

 These are of the variety formerly known as V. mexicana 

 Macq., but which should be called violacea Say, as the 

 latter name has priority. 



El Taste, Baja California (Eisen). September. 

 One male and two females. Comondu, Baja California 

 (Haines). March. One 5 . Magdalena Island, Baja 

 California (Haines). March. One?. 



38. VoLUCELLA FORNAX n. Sp. 



El Taste, Baja California (Eisen). September. One 

 5 . Considerably resembling V. apicifera Towns. Dif- 

 fers as follows from description of that species (see Trans. 

 Am. Ent. Soc, 1895): Length, 12 mm. A well defined 

 black facial stripe. Cheeks polished shining black. 

 Frontal triangle with a blackish median Hne or vitta. 

 Vertical triangle black. Antenna? blackish brown, sec- 

 ond joint reddish yellow. Arista nearly bare. Pleurae 

 with white pile. Prescutellar parallelogram emarginate 

 in middle anteriorly, the black nearly dividing it into two 

 square spots. Posterior black margin of second abdom- 



