56 PROCEEDINGS OF THE NATIONAL MUSEUM vol.83 



to eye on lower part; face somewhat bulging at middle with the 

 lower edge protuberant, its ridges flat and bare; cheek sparsely 

 black haired, four-fifths the eye height; apical segment of proboscis 

 more slender than in the other members of the group, about three- 

 fourths the height of head ; back of head gray pollinose clothed with 

 gra}'^ hairs. 



Thorax marked with four narrow dark stripes, which are poorly 

 defined behind the suture; pleura black haired; scutellum red on 

 apical half, dusted with gray pollen. Chaetotaxy : Acrostichal, 2, 3 ; 

 dorsocentral, 2, 3 ; intraalar, 3 ; supraalar, 3 ; postalar, 2 ; humeral, 

 5; posthumeral, 2; notopleural, 2; presutural, 2; pteropleural, 2; 

 sternopleural, 2, 1; scutellum with 4 marginals (one nearest base 

 small) and a decussate apical pair; postscutellum gray pollinose; 

 calypters opaque, white. 



Abdomen red, the venter and narrow hind margin of third segment 

 black, a broad obscure dark median stripe on the intermediate seg- 

 ments; the pollen gray, rather thin and changeable when viewed in 

 different angles; first segment without median marginals; second 

 with one pair and three at the side; third with a marginal row of 

 about 10; fourth bristly on the apical half above; intermediate 

 segments without discals; inner forceps short, united, and tapering 

 .sharply from base to apical third, the apex narrow and strongly 

 convex behind; outer forceps nearly straight when viewed from be- 

 hind, evenly tapering, shining black beyond the base; fifth sternite 

 deeply incised, the lobes black, sparsely clothed with black hairs. 



Legs black, tibiae largely yellow; pulvilli grayish, shorter than 

 apical tarsal segment; mid tibia with two large bristles on outer 

 front side. 



Wings graj^-hyaline ; fourth vein with a rectangular stumpless 

 bend, sliortly beyond which it curves outward continuing in an 

 oblique direction toward costa, narrowing the first posterior cell 

 which is open far before the tip of wing; third vein with a series of 

 bristly hairs extending over halfway to small cross vein ; last section 

 of fifth vein about one-fourth the preceding section; epaulets red; 

 costal spine not developed. 



Length, 8.5 mm. 



Female. — Unknown. 



Remarks. — Described from one male specimen labeled Delfrey, 

 Calif., December 27, 1930 (C. H. Martin) ; received from Charles H. 

 Martin, to whom it is returned. 



The wider front and the presence of marginal bristles on the sides 

 of the second abdominal segment readily distinguish the species from 

 all the other forms possessing ocellar bristles. 



