394 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



In the Riverside collection : 1 male, Putah Canyon, on boundary 

 of Yolo and Solano Counties, Calif., on elderberry, February 29, 

 1936 (R. M. Bohart) ; 2 males, Berkeley, March 7, 1934, and 

 March 26, 1935 (Bohart) ; 1 female, Berkeley, on Ranunculus, 

 March 19, 1939 (E. G. Linsley) ; 2 males, 1 female, Visalia, 

 March 29, 1939, and 1 female, on red clover, April 21 (F. T. Scott) . 



The material of chlorogaster from southern California is at 

 least subspecifically distinct, and three races can be distinguished 

 as based on the males. 



KEY TO SUBSPECIES OF ANDRENA (MICRANDRENA) CHLOROGASTER 



1. Flagellum dark reddish brown beneath ; medio-apical lobes of stipites longer 



than wide and more or less pointed 2 



Flagellum ferruginous beneath; medio-apical lobes of stipites blunt and no 

 longer than their basal width; reflexed dorsal margins of sagittae, just 

 beyond the basal expansion, arched as seen from side and nearly parallel 

 with each other (Oregon and northern California). 



chlorogaster chlorogaster Viereck 



2. Sides of face with only a trace of black hair; medio-apical lobes of stipites 



a little longer than wide; rounded expansion on inner margin of para- 

 meres near base longer than in chlorogaster; reflexed dorsal margins of 

 sagittae, just beyond the basal expansion, about as in chlorogaster 



(Santa Catalina Island) chlorogaster nesiotes, new subspecies 



Sides of face with considerable black hair; medio-apical lobes of stipites 

 about twice as long as their basal width; expansion on inner margin of 

 parameres near base as in nesiotes; reflexed dorsal margins of sagittae, 

 just beyond the basal expansion, hardly arched and strongly divergent 

 basad (San Diego and Riverside Counties). 



chlorogaster gavilanica, new subspecies 



ANDRENA (MICRANDRENA) CHLOROGASTER NESIOTES, new subspecies 



Male. — To the characters given above, it is necessary to add 

 only that the antennae are somewhat shorter than in chloro- 

 gaster, with the joints of flagellum each about one and one-fourth 

 times longer than thick. Length 5.5 mm. ; anterior wing 4.7 mm. 



Type. — One male (holotype), Santa Catalina Island, Calif., 

 March 26, 1937 (Cockerell), in the collection of the Citrus Ex- 

 periment Station. 



ANDRENA (MICRANDRENA) CHLOROGASTER GAVILANICA, new subspecies 



Male. — Almost exactly agreeing with nesiotes, except in re- 

 gard to the characters noted in the above key. Length 5.75 mm. ; 

 anterior wing 4.7 mm. 



Female. — Not distinguishable in any appreciable degree from 

 typical chlorogaster. Length 6.5 mm. ; anterior wing 4,5 mm. 



Types. — Holotype (male), allotype, and 9 paratypes (females), 

 The Gavilan, Riverside County, Calif., at flowers of Lomatuim 

 dasycarpum and Sanictda bipinnatifida, March 27 and April 10, 



