412 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



Wings dusky hyaline, the stigma and nervures dark ferruginous 

 (these parts piceous in paratypes, excepting those from Inyo 

 County) . Tibial spurs testaceous yellow. A small transverse blister 

 at base of mandibles, yellowish. Pubescence of head and thorax 

 denser than in atoposoma, whitish on face, cheeks, underside of 

 thorax, and fulvous or fulvo-ochraceous on vertex, mesonotum 

 and metanotum, with hair of propodeum similar but paler. Ter- 

 gites 1 to 4 each with a dense, white apical hair band, and the 

 disk of tergites 2 to 4 between the bands with rather dense, I 

 short, erect black hair. Disk of tergite 1 in front of the band 

 with long, erect hair, which is white or slightly tinged with ful- 

 vous. Fimbria pale chocolate brown, shading into whitish at the 

 sides and base of the fifth segment. Hair of legs fulvo-ochra- 

 ceous, more whitish on the femora, and becoming ferruginous on 

 front tarsi and on underside of middle and hind basitarsi. Facial 

 foveae pale brown, broad, reaching nearly to lateral ocelli, but 

 failing to reach level of antennae. Process of labrum broader than 

 long, with a large triangular emargination at apex. Clypeus pol- 

 ished and prominent, with the transverse anterior groove strongly 

 arcuate and receding from the margin on each side. Disk of 

 clypeus gently convex and nearly impunctate, except for a group 

 of fine punctures on each side of a slightly ridged median space 

 on the upper half. Sides of face below antennae, f rons, and almost 

 all of the thorax finely and closely punctured. Abdomen still more 

 finely and closely punctured than thorax. Antennae longer than 

 in atoposoma, with the middle joints of flagellum a little longer 

 than thick. Lrength, about 11-12 mm.; anterior wing 7.5-8 mm. 

 Male. — Black, with the white lateral face marks triangular, 

 broad below and coming to a point at level of antennae. Clypeus 

 more prominent and more produced beyond base of mandibles 

 than in atoposoma. Mandibles with a transverse testaceous blis- 

 ter at base on outer side. Antennae longer than in atoposoma, 

 the joints of flagellum nearly twice as long as thick. Sides of 

 face, frons, and almost the whole thorax and abdomen finely 

 and closely punctured, the punctures rather dense on notum of 

 thorax and tergum of abdomen, so that the surface is consid- 

 erably less shining than in atoposoma. Pubescence long, white, 

 and dense, being denser than in atoposoma, with some fuscous 

 or black hairs intermixed on the posterior middle of mesoscutum 

 and on the scutellum. Hair of abdomen long and erect, not form- 

 ing bands, and longer on the first segment and at sides of the 

 seventh than elsewhere. Some short, fine fuscous hair inter- 

 mixed at the extreme base of at least tergites 5 and 6. Pygidial 

 plate of seventh tergite triangular, very acute at apex, the 

 broad basal half with a median carina, but this carina much 



