128 BULLETIN 144, UNITED STATES NATIONAL MUSEUM 



One is as pale above as the average of New Mexican skins, one is 

 nearly as dark as those from Oaxaca, and the others are interme- 

 diate, but all are perhaps best referred to the subspecies thyscmodes. 

 In the series of 20 skins from Cloverdale Hills, southwestern New 

 Mexico, one or two are more intensely colored than the average. 



MYOTIS THYSANODES AZTECUS, new snbspedes 



Type. — Skin and imperfect skull, No. 58.6.2.3 British Museum 

 (Natural History), collected at San Antonio, Oaxaca, Mexico. 

 Tomes collection, 1860. 



Distribution. — Southern Mexico (Oaxaca). (See map 8, p. 122.) 



Diagnosis. — Similar to the typical form, but darker in color. 



Color. — The color is a uniform " tawny olive " above, the tips of 

 the hairs somewhat shining, their bases dark, nearly fuscous black; 

 a dark fuscous spot at the shoulder. Below, the paler tips to the 

 hairs are tinged with buflfy, producing a duller effect than the whitish 

 tips of typical Myotis thysanodes. 



Skull. — The skulls of the specimens from Oaxaca are all damaged 

 posteriorly and have the zygomatic arches broken. They are never- 

 theless obviously shorter of rostrum than in the typical subspecies. 



Measurements. — For measurements, see tables, pages 128 to 130. 



Specimens exaymined. — Total number 6, from the following 



localities : 



OAXACA: Hacienda de Cinco Seiiores, 5 skins (B. M.) ; San Antonio, 1 

 skin (B. M.). 



External measurements of Myotis thysanodes 



>Tyi)e. 



