290 AMERICAN HYMENOPTERA. 



bution. It is hoped that this method may be of" service to those 

 who are working on the distribution of bees, while of course all 

 subsequent studies concerned with the same species will tend to 

 establish or disprove the validity of my groupings. It will be noted 

 that while the majority of the species are characteristic of particular 

 zones, or are at least especially austral or boreal, a few range widely 

 through many zones. 



I have not given all tlie details of dates and flower- records, etc., 

 most of which have already appeared in connection with the de 

 scriptions and records of the species in various publications.* 



The following abbreviations are used : 



Localities : M. V. = Mesilla Valley ; L. V. = Las Vegas ; L. V. 

 H. S. = Las Vegas Hot Springs ; S. F. = Santa Fe. 



Collectors : C. = T. D. A. Cockerell ; W. P. C. = Wilmatte Por- 

 ter Cockerell ; V. = H. L. Viereck. 



Particulars concerning the localities will be found in Proc. Daven- 

 port Acad. Sci., IX, pp. 8-14. 



An asterisk following the name of a locality signifies that it is 

 the type locality of the species or subspecies. 



PROSOPliS Fabr. 



Hudsonian to Canadian. 



P. basalis Smith. Top of Las Vegas Range (11,000 ft.) ; Beulah. 



P. varifrons Cress. Top of Las Vegas Range; Beulah ; Dailey Canon. 



Canadian Zone. 



P. antennata Cress. Beulah, prox. 8000 ft. Fls. Eoripa. 



P. rudbeckise ruidosensis Ckll. Beulah ; Rio Ruidoso. •• Fls. t^crophularia. 



P. tridens Ckll. Beulah. Typ. loc. in Colo., at 7000 ft. 



P. rugosula Ckll. Beulah. Typ. loc. in Colo., at 9500 ft. Fls. Roripa. 



P. dig-itata Ckll. Beulah. Typ. loc. in Colo. 



P. nucleolus Yier. Beulah.* Fls. SaUx. 



P. senig-ma Yier. Beulah.* 



P. clandestina Yier. Beulah.* 



P. citrinifrons Ckll. Beulah. Typ. loc. in Colo., at 8500 ft. 



P. wootoni Ckll. Beulah; Rio Ruidoso.* F]s. Scrophuluria. 



P. tuertonis Ckll. Tuerto Mtn., near S. F., 8550 ft.*; also Florissant, Cole 



(Rohwer.) , This is the species cited without name in Entomologist, 1898. 



p. 217 (9). 



* See especially Tables for the Determination of New Mexico Bees, in Bull. 

 Sci. Lab. Denisou University, Vol. XI (1898). 



