38 ZOOLOGY. 



the regions explored, and serve to show that the operations of the expeditions 

 in this department of science are not behind those which have been con- 

 ducted in other fields of research in interest and importance. Although the 

 collection contains no novelties, it includes a fair proportion of the rarer and 

 less generally known species, among which the peculiar deer of Arizona and 

 Sonora may be particularly noted. It also extends the previously known 

 range of some species, like Lepus bairdii, Mustela americana, and Putorius 

 longicauda, not hitherto recognized as occurring in so low a latitude. The 

 collections were made at points too remote to permit the basing upon them 

 of any very nice zoo-geographical conclusions ; but they may be said to bear 

 out the general characters by which the southern portion of the Middle 

 Faunal Province, as defined by Baird, is recognized. An almost entire 

 absence of Mexican types is noteworthy, taken in connection with the un- 

 expectedly large number of sub-tropical birds, which the indefatigable 

 labors of Mr. Henshaw have shown to inhabit the same region. Much, 

 however, remains to be done in this part of the country before our knowl- 

 edge of .its Mammalia reaches the point already gained in ornithology. 



The specimens collected are deposited in the National Museum at the 

 Smithsonian Institution, AVashington, with the exception of some of the 

 osteulogical material, which has been presented to the Army Medical Museum. 



