194 Bulletin American Museum of Natural History. [Vol. III.] 



25 ; palatal breadth at middle of palatal bridge, n ; length of nasals, 27 ; width 

 of nasals posteriorly, 14 ; width at anterior border, 10 ; length of zygoma, 28 ; 

 length of upper molar series at alveolar border, 14 ; length of lower jaw (?) ; 

 height at coronoid process, 32. 



TyP e > sVWa. U. S. Nat. Mus., Mirador, Mexico; C. Sartorius. 



It hence appears that thus far no authentic specimens of either 

 L. palustris or L. aquaticus are known from Mexico, the habitat 

 of the former being, so far as now known, Florida and the coast 

 region of Georgia and the Carolinas, and of the latter, the Gulf 

 coast of the United States, from western Alabama to Texas, and 

 thence northward in the cane-brake region to southern Illinois. 

 Their introduction into the list of Mexican mammals, so far as 

 the present writer is concerned, is due to the fact that the skulls 

 of the Mexican specimens referred to these species were not 

 removed from the skins for examination, the determinations being 

 based on external characters, which proved very misleading. 



