406 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



T7/2?es.— U.S.N.M. No. 28522. Holotype (female), Los Angeles 

 County, Calif. (Coquillett). Allotype, in the collection of the 

 Citrus Experiment Station, taken at The Gavilan, April 27, 1938. 



Paratypes, in the collection of the Citrus Experiment Station: 

 5 females. Riverside, 2 on Encelia farinosa, 1 on Cryptantha 

 intermedia, and 2 on Platystemon calif ornicus, March 5 to April 

 10; 13 males, 5 females, The Gavilan, on Cryptantha intermedia, 

 except 3 of the males flying about juniper trees, April 10 to 

 May 4; 4 females, 4 to 41/0 miles west of Perris, on Cryptantha 

 and Platystemon, March 27 and April 10 ; and 2 males, 1 female, 

 Temecula, on Cryptantha intermedia, April 7 (Timberlake). 



As far as is known the female collects pollen exclusively from 

 Platystemon. 



ANDRENA (SIMANDRENA) OPACELLA, new species 



This species is allied to A. nasonii Robertson and A. orthocarpi 

 Cockerell. It agrees with the latter in size, in general appearance, 

 and in the finely sculptured basal area, but it differs in the duller 

 head and thorax, erect hair of clypeus, and fulvous-tinted wings. 

 It agrees with nasonii in color of wings and dull mesoscutum, 

 but the basal area is much more finely sculptured, the head 

 broader, with dark foveae, the process of labrum smaller, and 

 the basal nervure opposite the nervulus. 



FewMe. — Black, the tarsi more or less reddened. Flagellum only 

 slightly brownish beneath. Mandibles red at apex. Tegulae rufo- 

 testaceous, darker at base. Wings fulvous tinted, the stigma and 

 nervures ferruginous, with the subcosta darker. Pubescence as 

 in orthocarpi except hairs of clypeus more erect, not curved for- 

 ward, and brownish except at sides. Facial foveae seal brown. 

 Tergites 2 to 4 each with a white apical hair band, that on 2 

 broadly interrupted and that on 3 more narrowly interrupted 

 medially. Apical fimbria light golden brown. Head much broader 

 than long, the facial foveae broad. Process of labrum small, sub- 

 triangular, obtuse at apex. Clypeus strongly convex, dull, and 

 roughened with fine papillae or wartlike elevations. Mesoscutum 

 strongly tessellate, subopaque, and with sparse, obscure punc- 

 tures. Scutellum more shining and more distinctly punctured 

 than the scutum. Basal area tessellate, opaque, its sculpture simi- 

 lar to that of remainder of propodeum. Abdomen somewhat shin- 

 ing, and finely punctured, especially on tergites 1 and 2, the 

 punctures about as in orthocarpi, and perhaps a little less dis- 

 tinct than in nasonii. Length about 7 mm. ; anterior wing 6 mm. 



T?/pes.— U.S.N.M. No. 59284. Holotype (female) and 2 female 

 paratypes, Mount Hamilton Range, Santa Clara County, Calif., 

 April 26, 1913 (J. C. Bridwell) . 



