146 HYMENOPTERA. 



moderate puncturation on the abdomen ; are larger than the 

 new Mexican specimens but smaller than the Nevada speci- 

 mens, and have yellow on the tegulse. A male from Oregon 

 has a very small supraclypeal mark, poorly formed lateral 

 marks, and very heavily punctured abdomen. One from 

 Colorado has very well formed, complete face marks like 

 the Nevada specimens, but sparsely punctured abdomen. A 

 male from Canada has very poorly developed face marks, 

 dark tegulae, and a very sparsely punctured abdomen. In 

 all of these the variation is so irregular that no line can be 

 drawn separating even varieties. 



The description of P. clandestinus Vier. corresponds almost 

 exactly to that of the New Mexican specimens of P. wootorii 

 in the collection, there being no characters which could in 

 any way distinguish the two. Viereck's specimens were 

 from the same locality as these and I have no doubt that 

 they are identical. At least they will have to be considered 

 so until further characters are given. 



P. divergens Ckll. is described as differing from P. wootoni, 

 "by its smaller size, white face, and spots on tegulse", but 

 cannot be distinguished by these characters. I have speci- 

 mens of this from Colo, and N. M. determined by Cockerell, 

 as well as the Baker collection from which it was described, 

 and all are indistinguishable in external or genital characters 

 from wootoni. 



P. excavata Swk. and Ckll. is only one of the series of 

 variable female specimens in this species ; the slight excava- 

 tion in the face marks is merely an incidental variation in pig- 

 mentation, often found in several species. I have examined 

 the type of this and compared it with the series mentioned 

 above, in which it is indistinguishable, (fig. 120). 



PROSOPIS POLIFOLII Ckll. 1901. 

 1901. P. polifolii, Ckll. Can. Ent. 33: 281. 

 \9QS. P. polifolii, CkW. Psyche. 10:74. 



1910. P. polifolii, Ckll. Ann. and Mag. Nat. Hist. Ser. VIII, 5:29. 

 Male. — Small ; most easily distinguished by absence of supraclypeal 

 mark, and by long lateral face marks. In general features it is quite 

 similar to P. woototn. 



