378 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



curved downward to end opposite the base of the expansion of 

 the parameres. Length 8-10 mm. ; anterior wing 5.8-6.4 mm. 



Types.— V.S.^M. No. 28533. Holotype (female) and allotype, 

 Riverside, Calif., on Cryptantha intermedia, the female March 6, 

 1929, and the male March 26, 1934. 



Paratypes in the collection of the Citrus Experiment Station: 



2 males, Riverside, on same flower, March 15 and 26, 1934; 2 

 females, 3 miles west of Ferris, on same flower, April 20, 1939; 



3 females, 4 miles west of Ferris, on same flower, March 27 and 

 April 10, 1946 ; 1 female. The Gavilan, Riverside County, on same 

 flower, April 10, 1946; 2 males, 4 females. Temecula, on same 

 flower, except one female on Platystemon calif ornicus and a pair 

 taken in copula on ground, April 7, 1944 (all Timberlake). 

 Paratypes in U. S. National Museum: U.S.N.M. No. 28533, 3 

 males, 15 females, San Francisco (J. C. Bridwell), which are 

 undated except 3 taken April 13, 1913, and one at Lake Merced, 

 May 5, 1912 ; 1 female, with abdomen missing, Los Angeles County 

 (Coquillett) ; and 1 male, San Diego. 



This is one of the species bearing a manuscript name given 

 by Viereck. I have not observed the pollen-collecting habits of 

 this bee. Only one female of those recorded above (one taken at 

 San Francisco, April 13) had collected pollen. This pollen con- 

 sists of very fine spherical grains of a dark-orange color. 



ANDRENA (PTERANDRENA) TSOCOMAE, new species 



Allied to A. gardineri Cockerell, but differs in the larger and 

 broader facial foveae, in the slender teeth of basal process of 

 labrum, the more shining mesoscutum, more strongly plumose 

 tibial scopa, etc. The male differs from the Colorado species in 

 having large lateral face marks, which are very small or absent 

 in gardineri. 



Female. — Black, the flagellum hardly reddened beneath. Claws 

 ferruginous, the spurs testaceous yellow. Tegulae shining dark 

 brown. Wings strongly dusky, the nervures and stigma dark fer- 

 ruginous, the subcosta and inner margin of stigma blackish. 

 Pubescence fulvo-ochreous, varying to whitish, rather dense on 

 the notum of thorax and short on mesoscutum. Base and lateral 

 margins of tergite 1 with thin hair, its apex and that of three 

 following segments with a dense broad band of light pubescence. 

 Disk of these tergites appearing nude, but bearing fine, short, 

 erect hair. Scope of hind tibiae strongly plumose. Flocculus of 

 hind trochanters ample, strongly curled. In specimens with 

 whitish pubescence, the scopa of hind tibiae and apical fimbria 

 of abdomen remain distinctly tinged with fulvo-ochreous. Facial 



