AMERICAN BATS — HANDLE Y 



113 



Table 3. — Comparison of crania of the subgenera of Plecotus (Idionycteris most 

 generalized, Corynorhinus most specialized, Plecotus intermediate) 



Broadening and anterior bulging of the brain case in P. phyllotis 

 and increase in depth of the brain case in P. townsendii may be re- 

 garded as specializations. Shortening, broadening, and flattening of 

 the rostrum together with enlargement of the anterior nares in P. 

 toivnsendii are specializations that are somewhat paralleled in P. 



