SOUTHERA CALIFORNIA ACADEMy OF SCIENCES. 89 



black hair. The male is a little over 11 mm. long, similar 

 to the female but with the labrum, clypeus, supraclypeal 

 band, lateral face-marks, large mark on mandibles, and 

 under side of scape all yellow (reddened by cyanide in the 

 specimen studied). The thoracic pubescence is quite bright 

 fulvous, mixed with black. The apex of the abdomen is 

 broadly rounded, with a deep median notch; not at all 

 spinose. Legs colored as in the female ; middle tarsi simple ; 

 hind femora greatly swollen ; hind tibiae broad and thick, 

 with a strong apical tooth; basal joint of hind tarsi broad, 

 ferruginous, with two teeth, the first one much the longest. 

 There is a small black spot on each side of the clypeus. 

 I had thought that this might possible be A. quinquefasciata, 

 Provancher, which I have not seen; but Provancher de- 

 scribes the thoracic pubescence as "blanche," and says 

 nothing about any intermixture of black ; neither does he 

 mention any spines on the hind tibiae and tarsi. 



BOMBUS. 



Bombus californicus, Smith. 

 This handsome species is easily known by its black color, with 

 the hair on the anterior part of the thorax, and a band on 

 the hinder part of the abdomen, yellow. The typical cali- 

 fomicus has the hair of the head black, but in the variety 

 columbicus (Dalla Torre) the hair of the face and the mid- 

 dle of the top of the head is yellow. In the specimens seen 

 by me, the malar space of the female is considerably larger 

 in californiCTis than in columbicus, and for this reason I am 

 strongl.y inclined to restore the latter to the rank of a 

 species. It would be a matter of considerable interest for 

 the naturalist ^of California to investigate the matter, and 

 see whether the two kinds ever come from the same nest. 

 Dr. Davidson has collected both kinds at Los Angeles, and 

 the true californicus also on Catalina Island. A worker of 

 columbicus was obtained by him at Bear Valley. The 

 columbicus form was also collected by Mr. Ehrhorn at Alum 

 Rock Park, San Jose, Calif., in 1902. 



Bombus edwardsii, Cresson. 



Two taken by Dr. Davidson at Los Angeles. Differs from B. 



californicus in having the hair of the scutellum and base 



of abdomen yellow. As regards the banding of the abdo- 



• men, B. edwardsii is to B. prunellae, as B. temarius is to 



B. juxtus. 



Bombus sonorus, Say. 



San Pedro, common (Cockerell). Visits fioM^ers of Datura 

 meteloides early in the morning. A species with the pubes- 



