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PROCEEDINGS OF THE NATIONAL MUSEUM 



Figure 15. — Distribution of Plecotus mexicanus G. M. Allen. Solid symbols, specimens 

 examined; open symbols, other records; encircled solid symbol, type locality. 



with at least a trace of such a cusp; upper canine somewhat reduced in 

 size; P* usually v/ith a small anterointernal cingular cusp. Tragus 

 (possibly also auricle) averages relatively short; cross-ribs on inter- 

 femoral membrane average eight. 



Measurements: See tables 8, 14. 



Comparisons: Compared with Plecotus townsendii australis and 

 P. t. pallescens, P. mexicanus is darker, with less contrast between 

 bases and tips of dorsal hairs; usually fewer cross-ribs on the inter- 

 femoral membrane; smaller tragus on the average; smaller skull; 



