NORTH AMERICAN BEES. 219 



we cannot determine whether there exists a distinctive Cali- 

 fornian race. 



(3.) P. suffusa, CklL, var. with the face more lemon-yellow. 

 The abdomen is strongly punctured. Tegulae all dark ; tubercles 

 with a yellow speck. 



(4.) P. tridentida, CklL The clypeus is somewhat shorter 

 than in the Colo. type. 



A female, which I can only refer to P. mesillce, is in the 

 U. S. N. M. from Los Angeles Co., collected by Coquillett. 



In Coll. Am. Ent. Soc. are several examples of a remarkable 

 female form, with the lateral face-marks triangular, quite broad 

 and short, rather of the modesta type, but the clypeus with a 

 broad yellow vertical stripe, or even wholly yellow except the 

 sides, which may then become rufescent. The tubercles are 

 light, and the tegulae have a spot. I had held this to be the 

 hitherto unknown female of bakeri, but I do not find it among 

 Mr. Baker's Colorado collections. 



A female from Placer Co., Aug. (A. Koebele), in U. S. N. M., 

 is of varifrons type, but the lateral face-marks are reduced to 

 mere specks. The tubercles have a yellow spot, with a black 

 speck on it, but the tegulae are wholly dark. The wings are 

 tinged brownish. A female in Coll. Am. Ent. Soc. looks like 

 varifrons. The tegulae have a very small obscure spot. 



Oregon. — There is a male P. divergens in Coll. Am. Ent. Soc. ; 

 it differs a little from the Colorado type, but is hardly to be de- 

 scribed as a distinct variety, I think. 



Washington State. — A male mesillce is in Coll. Am. Ent. 

 Soc. ; I was quite surprised to see it from so far north. As shown 

 above, this species is also found in Cala. 



Vancouver I. — The Coll. Am. Ent. Soc. contains a male 

 P. citrinifrons and a couple of female basalis; also a female of 

 the varifrons type, with dark tegulae, like the Californian form 

 mentioned above 



Mexico. — I have before me males of mexicana and grossa, sent 

 by Mr. Baker. Cresson describes azteca, dubiosa, mexicana, and 

 grossa, all obtained by Sumichrast at Orizaba. Smith's maculi- 

 pennis and trepanda are from Oajaca. 



It will be seen from, the above review how little we know 

 about the females of N. American Prosapis. It is evident that 

 the numerous females of the varifrons type, which might be 

 thought to belong to a single species, almost certainly should be 

 referred to several species having easily recognisable features in 

 the male. 



(To be continued.) 



