207 



Polyphylla hammondi. Tex. to Ariz. 



Mecas pergrata. Dak to Tex., Col., Kan., and N. M. (B),S. 111. 

 prairie (I). 



Metachroma angustulum. Mont. 



Metachroma parallelum. Mont., Kan. 



Epitragus acutus. Kan., Tex., Mex. 



Phacepholis Candida. Kan., Col., Tex. and N. M. (B). 



Acontia lactipemiis. Tex. 



Crambus haytiellus. Tex., Hayti. 



Asilus angustifrons. Wash. 



Rhadiurgus leucopogon. Neb., S. D. 



Zodion obliquefasciatum. S. D., Kan., Tex. to Ariz., Mex., 

 Mont., Wash. 



Chelonus angheri. Neb. 



SpJicerophthalma 4- guttata. Kan., Tex. 



Trielis octomaculata. Ark. 



Odynerus geminatus. Tex. 



Anthophilus pulchellus. Col. 



Tachytes texanus. Tex. 



It will be seen that the above general list fully bears out 

 the inference drawn from the Orthoptera alone that the deriva- 

 tion of this sand fauna is predominantly western. Of 85 species, 

 in all, which are not of general distribution, and which, there- 

 fore, according to Morse, are of especial value in studying fau- 

 nal differentiation. 73 range in some definite direction from 

 the sand region. Less than three percent of these (2 species) 

 can be classed as northern, and neither of these is confined to 

 sandy land. Over 14 percent (11 species) are southern, the in- 

 crease over the northern species being related to the southward 

 extension of the Great Plains fauna. The range of several on 

 this list seems to be imperfectly defined. Eighteen percent 

 (13 species) are eastern species, one of them (Sphceridium scara- 

 bceoides) lately introduced, and its western limit carried by this 

 record still farther westward. Several of these are apparently 

 rare species, really of larger range. Pentatoitta juniperina, Chair- 



