AMEBIC AN BATS OF THE GENERA MYOTIS AND PIZONYX 193 



sides of the abdomen and in the anal region, where the hairs are clear 

 white throughout. Membranes blackish brown. 



Skull. — The skull is like that of true M. chiloensis, with a rather 

 marked narrowing of the braincase anteriorly, and a weakly developed 

 sagittal crest. The two minute upper premolars are seldom exactly 

 in the line of the toothrow, but are usually drawn slightly inward, 

 with a tendency for the longer anterior tooth to stand partly to the 

 palatal side of the base of the canine. 



Measurements. — For measurements see tables, pages 195 and 196. 



Specimens examined. — Total number 12, from the following 

 localities : 



CHILE: Santiago, 6 skins (B. M.) ; Valparaiso, 3 skins (B. M.) ; no exact 



locality, 2 skins (B. M.). 

 PERU: Ollantaytambo, 1 skin (U.S.N.M.). 



Remarks. — It is well known that as one proceeds northward coast- 

 wise, from southern Chile, the country becomes dry and even desert 

 in contrast to the damp cool climate of the southern coast. These 

 drier conditions have had their effect on the local representatives of 

 Myotis chiloensis, producing a pale-brown race with grayish-white 

 belly, in contrast with the excessively dark 31. chiloensis cMloensis of 

 the humid coast region, and the yellowish M. c. dinellii of the di"y 

 country east of the Andes. 



MYOTIS CHILOENSIS OXYOTUS (Peters) 



Vespertilio oxyotus Petees, Monatsber. K. Akad. Wiss. Berlin, 1866, p. 19. — 

 DoBSON, Catal. Chiroptera Brit. Mus., 1878, p. 320. — Troxjessart, Catal. 

 Mamm. viv. foss., p. 130, 1897. 



Myotis thoniasi Cabrera, Bol. Soc. Espan. Hist. Nat., Madrid, vol. 1, p. 370, 

 1901; vol. 2, p. 293, 1902 (Archidona, near headwaters of the Rio Napo, 

 Ecuador). — Teouessart, Catal. Mamm. viv. foss., suppl., p. 95, 1904. 



Myotis oxyotus Trouessart, Catal. Mamm. viv. foss., suppl., p. 94, 1904. — J. A. 

 Allen, Bull. Amer. Mus. Nat. Hist., vol. 33, p. 384, July 9, 1914. 



Myotis sp. Osgood, Field Mus. Nat. Hist., publ. 176, zool. ser., vol. 10, p. 182, 

 April 20, 1914. 



Type locality. — ^Mount Chimborazo, Ecuador, at 9,000 to 10,000 

 feet altitude. 



Type specimen. — A female ( ? in alcohol) in the Zoological Mu- 

 seum of Munich, Germany, collected at 9,000 to 10,000 feet on Mount 

 Chimborazo, Ecuador, by Dr. Moritz Wagner. 



DistHhution. — Andean region from northern Ecuador southward 

 into Peru, and probably to northern Argentina. 



Diagnosis. — Very similar to typical Myotis cMloensis in general 

 appearance, but color less dark, glistening tips of longer hairs on 

 back more conspicuous, and ear usually longer. 



