AMERICAN BATS OF THE GENERA MYOTIS AND PIZONYX 199 



Skull and teeth. — The cranial and dental characters are essentially 

 like those of Myotis chiloensis except that the skull is more heavily 

 built and the sagittal and ISmbdoid crests are better developed. A 

 noticeable sagittal crest aj)pears to be always normally present in 

 adult skulls imparting to the brain case a characteristic ridged ap- 

 pearance quite different from the nearly smooth surface usually seen 

 in M. chiloensis and in the smaller M. nigricans. 



Measure7nent8. — For measurements see tables, pages 199 and 200. 



Specimens examined. — Total number 10, from the folloAving 

 localities : 



BRAZIL: Rio Grande do Sul, San Lorenzo, 2 ale. (B. M.) ; no exact 



locality, 1 skin (B. M.). 

 PARAGUAY: Sapiicay, 1 skin, 2 ale. (B. M.) ; 1 skin, 1 ale. (U.S.N.M.). 

 "SOUTH AMERICA": 2 skins (B. M.). 



. Remarks. — Although named more than 120 years ago on the basis 



of Azara's description, Myotis ruber is still rather imperfectly known. 



The exterior was well represented by D'Orbigny and Gervais, but 



• 1 1 5 

 they figured and described the teeth as i ^^ c y* m -^^ thus following 



Azara, who says, "Dans la machoire d'en-haut, est une incisive de 

 chaque cote, laissant un espace au milieu; ensuite vient une canine. 

 En-bas, il parait y avoir deux incisives reunies, et tout de suite deux 

 canines.'" Temminck had already doubted the correctness of Azara's 

 statement regarding the number of incisors, on the basis of the in- 

 dividual (from Corrientes, Argentina) figured by D'Orbignj'^ and 

 Gervais. The skull in question, however, was probably that of a 

 Tadanda {^^ Nyctino^nus''^) , presumably the specimen later figured 

 in more detail by Gervais,^^ wherein are seen the minute two-cusped 

 lower incisors of characteristic form. In 1902 Thomas for the first 

 time allocated Geotfroy's name and briefly defined the more salient 

 peculiarities of the species. 



External measurements of Myotis ruber 



"Exp^d. Castelnau, 1855, pL 14, fig. 3-3b. 



