178 PROCEEDINGS OF THE ACADEMY OF [Oct., 



with brown.) Style one half as long as third antennal joint. Face 

 conical; epistoma narro\V, pilose. Proboscis not protruding. Fore 

 tibiae slender, bare; hind femora slender, with long bristles. First 

 posterior cell open. Length, 9 mm. Wings, root to tip, 18 mm. 



Type. — 9 ; Nogales, Sonoma, Mexico, August 12, 1906, (P. P. 

 Calvert), [A. N. S. P. No. 6200]. 



Exoprosopa jonesi new species. 



Allied to doris 0. S., but the antennae are entirely black, and the 

 second band of the wdngs is more extensively developed towards 

 the margin. In the paratype this band broadly attains the margin. 

 The yellow tomentose design of the abdomen suggests grata Coq. 



9 . Black; lower frons, face, scutellum, lateral abdominal mar- 

 gins, venter, femora, tibiae, bases of tarsi, tawny. Club of halteres 

 pale. Wings with bases of first and second basals, anal, and axillary 

 cells, hyaline. Bases of first submarginal, first posterior, discal, 

 third and fourth posteriors, and more or less of apices of anal and 

 axillary cells, infuscated. Second band of infuscation includes base 

 of second posterior nearly to margin along the veins. Base of third 

 submarginal also infuscated, but apex of marginal is hyaline. Pile 

 black on: frons, face in part, first and second antennal joints, meso- 

 notum; lateral margins of second and following abdominals slightly 

 mixed with black, pale. Pile pale on face in part, collar, mesonotum 

 laterally, pleura, coxae, lateral margins of first abdominal segment 

 and venter. Tufts of white pile above and below roots of wings. 

 All tomen yellow except silvery along orbits, and black on some parts 

 of pleura and on apices of second to fifth abdominal segments; also 

 medially almost to bases of third to fifth segments, becoming stronger 

 on base of fifth. No white tomen on abdomen except some on 

 venter, but that on the second segment is slightly paler than on the 

 other segments. Tomen on legs yellow. Second antennal joint 

 twice as long as first; third as long as first two together, long, conical; 

 style rather thick and slightly flattened, a fourth to a third as long 

 as third joint. First posterior cell open. Tooth of claws small. 

 Length, 12 mm. 



Type. — 9 ; Keddie, Plumas County, California, July 3, 1918, 

 (F. M. Jones), [A. N. S. P. No. 6214]. Paratype.— I 9 ; topotypical. 



These specimens were captured hovering over nests of a species of 

 Bemhex. 



Exoprosopa (Exoptata) ingens new species. 



Similar to but much larger than divisa Coq. The pile of the 

 mesopleura is mostly black as is also the tuft beneath the wings. 



