380 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



Paratypes in the collection of the Citrus Experiment Station: 

 11 males, 28 females, Riverside, on same flower and on Gutier- 

 rezia calif ornica, the males taken from September 27 to October 

 20, the females from October 9 to November 8, in different years ; 



2 males, 3 females, Morongo Valley, San Bernardino County, on 

 Gutierrezia lucida, October 5, 1934, and September 26-27, 1944; 



3 males, 18 females. Yucca Valley, on same flower, September 28 

 and 30, 1944; 2 males, 5 females, at summit of ridge (on high- 

 way) dividing Morongo and Yucca Valleys, on same flower, Sep- 

 tember 28, 1944 (all Timberlake) ; in the collection of the Uni- 

 versity of California: 1 female. Fort Tejon, October 20, 1938 

 (F. T. Scott) ; 5 males, San Diego, August 25, 1927 (J. C. von 

 Boeker) ; 2 males, 9 females, Antioch, Contra Costa County, on 

 unidentified Compositae, September 8, 1948 (P. D. Hurd and 

 J. W. MacSwain) ; 1 male, 1 female, same locality, on Gutierrezia, 

 September 13, 1936 ; and 1 female, Naples, Santa Barbara County, 

 August 15, 1935 (E. G. Linsley). 



ANDRENA (PTERANDRENA) TREVORIS Cockerell 



A7idi-ena trevoris Cockerell, Entomologist, vol. 30, p. 306 (male), 1897. 



This species was described from Olympia, Wash. I have a male 

 from Corvallis, Oreg. (Scullen), taken, as was the type, on June 

 12, although 30 years later. Cockerell compared his species with 

 A. bipunctata Cresson (flavoclypeata Smith), and the males of 

 the two species are indeed very similar, although belonging to 

 different groups. The female, which I believe belongs here, is new. 

 It is remarkable for having the hypostomal carinae extremely 

 high, and nothing even approaching this condition has been seen 

 in any other species. The carinae are present also in the male but 

 are not so high. 



Male. — Black, the clypeus yellow, with exception of the anterior 

 margin and two dots on the disk. Tarsi ferruginous, the flagellum 

 dark ferruginous beneath. Cheeks very broad and rounded behind. 

 Antennae rather long, with joint 3 distinctly longer than the fol- 

 lowing joint, but shorter than 4 and 5. Wings reddish smoky, 

 the stigma and nervures ferruginous. Clypeus shining, minutely 

 and closely punctured. Frons finely striato-rugulose. Mesoscutum 

 finely and strongly punctured, the surface tessellate, rather shin- 

 ing, and becoming almost polished on the posterior middle and 

 scutellum. Abdomen shining, with minute, close, setigerous punc- 

 tures. Pubescence pale ochreous or grayish, moderately sparse 

 on head and thorax, and short and suberect on the abdomen, be- 

 coming depressed on apical margin of the tergites to form narrow, 

 fringelike apical bands on segments 2 to 5. Length 8 mm. ; anterior 

 wing 6.5 mm. 



