AMERICAN BATS OF THE GENERA MYOTIS AND PIZONYX 191 



no specimens from the higher elevations are available to show the 

 transition between it and M. c. dinellii of the drier country east of 

 the Andes. Passing northward along the coast the dark form soon 

 pales into the desert race atacamensis. 



There seems little doubt that the Vespertilio gayi Lataste, based on 

 the description of Vespertilio chlloensis in Gay's Historia de Chile, is 

 this same animal. The account in Gay's Historia was based on a 

 specimen from Valdivia, Chile, where the author had found it com- 

 mon in the houses. The specimen he described and figured was 

 abnormal in having the second upper premolar crowded inward 

 from the tooth row so as to stand in the angle between first and third 

 premolars. The forearm measurement (1 inch and 3 lines — French 

 translated into Spanish) was about 35 mm., the same as in small 

 individuals of M. chiloensis chUoensls. Apparently no other Myotis 

 has been discovered so far south in Chile. While no specimens are 

 at hand from Valdivia, those from Temuco, only a short distance 

 to the northward, represent typical M. chiloensis. 



Lataste mentions a breeding colony of these bats which he found 

 on November 21 in a disused copper foundry; he captured several 

 adult females and found that each contained a single embryo or 

 had just given birth to its young. 



MYOTIS CHILOENSIS DINELLII Thomas 



Vespertilio chiloensis Dobson, Catal. Chiroptera Brit. Mus., p. 322, 1878 (part). 



Vespertilio sp. Thomas, Ann. and Mag. Nat. Hist., ser. 6, vol. 20, p. 214, August, 

 1897. 



Myotis dinellii Thomas, Ann. and Mag. Nat. Hist., ser. 7, vol. 10, p. 493, Decem- 

 ber, 1902. — Tkouessakt, Catal. Mamm. viv. foss., suppl., p. 94, 1904. 



Type locality. — Tucuman, Catamarca Province, Argentina. 



Type specimen. — Female, skin and skull. No. 0.7.9.4 British Mu- 

 seum (Natural History), from Tucuman, Catamarca Province, 

 Argentina. Collected April 7, 1899, by L. Dinelli. 



DistHhution. — Argentina, Uruguay, and Bolivia; exact limits of 

 range not known. 



Diagnosis. — A bright yellowish-brown race of Myotis chiloensis; 

 throat and belly grayish buff; color of back uniform, without 

 speckling. 



Desadption. — Color above varying from deep " ochraceous buff " 

 (Tucuman skins) to light "ochraceous tawny" (Bolivia). The 

 long hairs of the back are the usual blackish brown for their basal 

 two-thirds, and the light-colored tips are slightly burnished. Below, 

 the hairs are brownish black basally, with fine buffy tips, giving to 

 the throat, chest, and belly a general dull grayish-buff cast, in some 

 specimens washed lightly with ochraceous. Ears and membranes 

 brownish black. 



