CHIEOPTERA VESPERTILIONIDyE ATALAPHA CLNEREUS. 91 



12-14; arm, 2; longest finger, 3.3-4J ; ear, -J. Lips -aud ears marked with black; 

 body colors rich chocolate brown, or smoky fawn color, overlaid with white, giving 

 a brilliant " hoary " appearance. 

 HAB. North America at large. 



Some reasonable doubt has been expressed respecting the specific 

 distinctness of this species and the last; but further comparison will be 

 required to prove it only a variety. Though very generally distributed, it 

 appears to prefer higher latitudes and more elevated regions, and is the only 

 bat known to occur in the northern regions visited by Kennicott. We have, 

 however, been favored with a specimen from the southern deserts of Arizona, 

 where it was taken by Lieut. C. Bendire, U. S. A. It is comparatively rare. 

 Dr. Allen writes us that he has only seen some twenty or thirty specimens 

 in all. 



Two specimens were secured in Thistle Valley, Eastern Utah, by the 

 expedition of 1872. 



This species, since Mr. Say described it, in Long's Report of Expedi- 

 tion to Rocky Mountains, has generally been known under the name of V. 

 pruinosus ; but Major LeConte corrected the error, and ascribed to Palisot 

 de Beauvois the prior name of V. cinereus, to which it was entitled. Dr. 

 Allen assents to the determination. 



Specimens. 



Genus VESPERTILIO, (L.) Auct. 



Vespertilio, L., of AUTHORS. 



Fcotophilm, LEACH, Trans. Linn. Soc., siii, 1822, 71. ALLEN, Mouog., 27. 



Vesperus, KEYS. & BLAS., Wirb. Eur., 1840, 49. 



Vesperuc/3, lid., ibid., 45. 



Vesperides, COUES, anted. 



CHARS. Incisors, * ; molars, *I* o; ^ or ^ or ^ ; teeth, in all, 32, 34, 3G,.or 38. 

 b o-u o-t) 0-0 0-0 



This dental formula sufficiently indicates a generic suction that may, 

 without violence, include all the remaining species of North American Bat;;. 



