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PROCEEDINGS OF THE NATIONAL MUSEUM 



Figure 19. — Distribution of Plecotus rafinesquii Lesson: 1, P. r. macrotis; 2, P. r. rafines- 

 quii. Solid symbols, specimens examined; open symbols, other records; encircled solid 

 symbols, type localities. Cross-hatching indicates known areas of intergradation between 

 subspecies. 



black or blackish and the tips white or whitish, with the two colors 

 sharply contrasted, whereas P. townsendii, on the other hand, always 

 has the bases of the ventral hairs slate, gray, or brownish and the tips 

 brown or buff, with the two colors often not sharply contrasted. 



A secondary cusp on the inner upper incisor is present in all speci- 

 mens of P. rafinesquii. It is absent (or represented only by a slight 

 shoulder) in all specimens of the geographically adjacent P. t. virgini- 

 anus. It is absent in most but not all examples of the geographically 

 more remote P. t. australis, P. t. pallescens, and P. t. townsendii. It is 

 usually present in geographically adjoining P. t. ingens. The secondary 

 cusp is present in all specimens of P. mexicanus. 



In P. rafinesquii there is usually, though not always, a small antero- 

 internal cingular cusp on P*. This cusp was not observed in specimens 

 of P. t. ingens or P. t. virginianus, but is usually present in P. t. town- 



