204 



BULLETIN" 144, UNITED STATES NATIONAL MUSEUM 



quite as in the latter species. The type was said by Dobson to be in 

 the Leiden Museum. A fourth synonym is clearly Vespertilio isidori 

 of D'Orbigny and Gervais (1847), based on a specimen from Cor- 

 rientes, Argentina. It has the characteristic short tail in proportion 

 to body (head and body 40 mm., tail 28) and a forearm of 33 mm.; 

 the color is well described as of a brownish-black at the base of the 

 hairs, which are pale yellow at the tips above, while the belly is 

 whitish, the hairs brown basally, the membranes bare. To these 

 synonyms is now added Vespertilio mundus H. Allen, the type of 

 which, in alcohol, has been examined through the kindness of the 

 Academy of Natural Sciences of Philadelphia, in whose collection it 

 bears the number 1812. It is immature but clearly shows the dis- 

 tinctive characters of the species. That it is Harrison Allen's actual 

 type is indicated not only by the locality (Maracaibo, Venezuela) 

 but by the original parchment tag on which the number 5547 of the 

 Smithsonian Institution can still be faintly traced. 



External measurements of Myotis albescens 



Locality 



£3 



•2^ 



Paraguay: 



Tacuaral 



Do 



Do 



Do. 



Do 



Do 



Do 



Bolivia: Rosario. 



Argentina: Rio Colorado-- 

 Brazil: Rio Grande do Sul. 

 British Guiana: Ireng 



VaUey. 

 Colombia: 



Condoto, Choco 



Do 



Panama: 



Tabemilla 



Do.. 



Costa Rica: Bebedero 



32.4 

 31.2 

 32.2 

 33.2 

 33.2 

 33.2 

 32.2 

 33.0 

 34.8 

 34.0 

 31.8 



33.4 

 34.2 



35.0 

 33.0 

 33.8 



32.0 

 31.0 

 30.2 

 32.2 

 32.0 

 31.4 

 31.2 

 31.0 

 33.4 

 31.8 

 30.0 



32.0 

 33.0 



12.8 

 12.0 

 11.2 

 12.0 

 12.2 

 12.4 

 12.8 

 12.5 

 14.6 

 13.4 

 12.8 



14.0 

 14.0 



32.4 14.6 

 31.21 14.2 

 32.2 13.6 



11.4 8.2 

 10.0 7.4 

 10.0 7.0 

 9.0 7.4 

 9.2 7.0 

 9.6 7.6 

 10.2 7.2 

 12.0 8.0 

 11.61 9.0 

 10. 8i 8.2 

 11.41 7.4 



11.4! 7.0 



12.2 8.2 



11.0 8.8 



11.2 7.8 



10. Oi 7.2 



