THE CANADIAN ENTOMOLOGIST. 281 



BEES FROM SOUTHERN CALIFORNIA, VISITING FLOWERS 

 OF ERIOGONUM AND RHUS. 



BY T. D. A. COCKERELL, EAST LAS VEGAS, N. M. 



Southern California has its dry season in the summer, and 

 comparatively kw flowers are to be seen. Among those that remain, 

 and are attractive to insects, the bushy species of Eriogonum are 

 especially noteworthy, and I was fortunate in obtaining from them 



several bees. 



Eriogonum fasciculatum was determined for me by Mrs. K. 



Brandegee. The Mt. Lowe species, which look very distinct from 



fasciculatum, is kindly identified by Miss Susan G. Stokes as E. 



fasciculatum polifolium, "one of the intermediate forms." This is the E. 



polifolium of Bentham. 



Prosopis polifolii, n. sp. — $ . Agrees with the description of P. 

 Nevadensis (Psyche Suppt., June, 1896, p. 32) except in the following 

 particulars : Clypeus and lateral marks very pale primrose yellow ; the 

 lateral marks rather narrow, triangular, not or hardly notched by the 

 antennal sockets, terminating above at a very acute angle with the orbital 

 margin, though the apical point is rounded, the inferior inner side of the 

 triangle at least not longer than the superior, sometimes visibly shorter ; 

 flagellum ferruginous beneath ; wings clear, strongly iridescent. There is 

 no vestige of a supraclypeal mark ; clypeus much longer than broad, 

 punctured and minutely roughened. 



Hab. — Alpine Tavern, Mt. Lowe, Calif, about 5,000 ft., Aug. 12, 

 1901, on flowers of Eriogonum polifolium ; La Jolla, Calif., about 150 

 ft., August, 1 90 1, on flowers of Eriogonum fasciculatum. The first- 

 mentioned locality is to be regarded as typical. The species, having no 

 supraclypeal mark, can only be confused with P. Nevadensis. 



Ceratina Arizonensis, Ckll., 1898—9. Similar to the $, but the 

 face is black, with a broad longitudinal white stripe on the clypeus. 



Bab.— Alpine Tavern, Mt. Lowe, Calif, about 5,000 ft., Aug. 12, on 

 flowers of Eriogonum polifolium. New to California. 



Perdita Claypolei, n. sp. — $. Length, 5 mm.; head and thorax 

 dark brassy green, with moderately abundant white hair; abdomen 

 piceous, with broad straight transverse chrome-yellow bands at bases of 



