SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 



The Bees of Southern California.— 1 . 



BY T. D. A. COCKEREIyL. 



The series of articles to appear under the above title will con- 

 tain descriptions and records of Southern California bees, and 

 it is hoped eventiially to publish tables for the identification of 

 all the species. 



Stelis laticincta, Cresson. 



Wilson's Peak, one male, collected by Dr. Davidson. 



Only the female has been described. The male is similar, but 

 only 6 mm. long, with the clypeus, a small supraclypeal mark, 

 and a line beneath anterior ocellus, all yellow, in addition to the 

 markings present in the female. The yellow stripes behind the 

 eyes are continuous right across the top of the head. The an- 

 terior and hind tibiae are yellow on the outer side. 



While working up the present insect I have become satisfied 

 that the New Mexico insect which has passed for years as S. 

 costalis, is quite distinct. It is to be said that Mr. Fox long ago 

 compared it with Cresson 's types, and did not think it was 

 costalis. It may be known as S. rudbeckiarum, n. sp.. the type 

 being my No. 1567, Santa Fe, July, at flowers of Rudbeckia. It 

 is about 7 mm. long, varying to 5i/2i cmtl the male agrees with 

 Cresson 's description of female costalis, except in the follow- 

 ing character: Tubercles and pleura wholly black tegulae 

 ferruginous, with a yellowish spot anteriorly; legs black, the 

 knees broadly and the tarsi red, the hind femora have a good 

 deal of red, and the tibiae show a little reddish on the inner 

 s^'de ; yellow band on third abdominal segment not indented. 

 The clypeus is entirely black. 



Dianthidium. 



Four species of this genus have been collected in Southern 

 California. In the following table they are separated and com- 

 pared with several species found elsewhere. 

 Scutellum all black in both sexes; size large (Europe).. 



septemdentatum (Latr.) 



Scutellum with at least some vellow or whitish; size smaller 



\ 1 



1. Small, compact species, with the hind edge of the scutel- 

 lum produced and sharp-edged, the yellow marks on 

 scutellum in a straight line or almost so ; posterior 

 coxae without spines. (Anthidiellum, n. subg., type 

 strigatum) 2 



