138 SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 



triangular tooth, the outer edge of which is densely clothed with 

 short orange hair; mesothorax strongly and very densely punc- 

 tured, thinly clothed with erect hair, some of which is black or 

 blackish; no band of dense hair between mesothorax and 

 scutellum; sides and under part of thorax with dense white hair; 

 tegulse dark brown, closely punctured; wings hyaline, dusky at 

 apex; anterior coxal spines short; legs with abundant white hair; 

 hair on inner (or anterior) side of tarsi light orange; anterior tarsi 

 nearly simple, but first joint laterally dilated and angularly pro- 

 duced on the inner side; second joint slightly dilated; these 

 joints densely fringed with white hair on the inner side; second 

 joint with a black spot, (due to local absence of pubescence) at 

 the base of the white fringe on the inner side; the orange hair on 

 the anterior tarsi is wholy on the anterior margin; at the apex of 

 each of the first two joints of the middle tarsi is a little comb of 

 three reddish-orange spines; abdomen strongly punctured, not 

 obviously banded, but the hind margins of the segments have 

 lateral white hair-bands; and the third, fourth and fifth segments 

 have bands of white pubescence (best developed on the fifth) at 

 the base of the normally exposed (punctured) part; ventral surface 

 of abdomen, especially towards the base, with much white hair; 

 apical dorsal segment very black, with short black hair, its end 

 deeply notched, the edges of the notch rounded; its extreme 

 lateral margins with a sharp tooth, curved backwards and shaped 

 like a rose-thorn; lateral plates of genitalia triangular. 



Hab. — Near Los Angeles; and Switzer's Camp (about 12 

 miles from Pasadena, in the San Gabriel Mts ) Two males 

 collected by Dr. A. Davidson. 



The entire black legs readily distinguish it from t3'pical 

 M. occidentalism the type locality of which is Las Cruces, New 

 Mexico, 



Megachile fidelis, Cresson. 



Near Los Angeles, both sexes, (Dr. A. Davidson). 



Megachile angelariiin,, Ckll. 



' An additional specimen is from Rock Creek, Mojave 

 Desert, (Dr. A. Davidson). 



Megachile frugalis, Cresson. 



A male from Dr. Davidson, Mt. Disappointment, San 

 Gabriel Mts. This species has hitherto been known from Texas. 



Megachile manifesta, Cresson. 



A pair from Dr. Davidson, collected at Banning, River- 

 side Co., offer some differences from the Rocky Mountain form of 

 the species, and should probably be recognized as a distinct geo- 

 graphical race. 



