MAMMALOGY. 



1. Class MAMMALIA. 



1. Order QUADRUMANA.— The Four-handed Mammals. 



1. Family YESPERTILIONIDyE.— The Bats. 

 1. Genus VESPERTILIO, Linn. Syst. Nat. I, p. 46 (176G). 



1. Vespertilio californicus, Bacliman. 



Vegpertilio californicus, Baciim. Jour. Acad. Philad. VIII, p. 285 (1842). 



Several specimens, which we consider as undoubtedly of this spe- 

 cies, are in the collection of the Expedition, and were obtained in 

 Oregon and California. Generally, they agree with the description 

 by Dr. Bachman cited, but the largest slightly exceed his measure- 

 ments. 



According to Mr. Peale, this bat was found in all parts of Oregon 

 visited by members of the Expedition, and also at San Francisco, Cali- 

 fornia ; but we find nothing recorded by either of the naturalists of the 

 Expedition relating to its manners or habits. It appears to belong 

 strictly to the same group as F. subulatus, Say, and may be a younger 

 age of that species. 



