AMERICAN BATS OF THE GENERA MYOTIS AND PIZONYX 205 

 Cranial measurements of Myotis albescens 



Locality 



Paraguay: 



Asuncion. 



Do 



Tacuaral 



Do 



Do.... 



Do 



Do 



Paraguari 



Do 



Argentina: 



Goya 



Do 



Ecuador: Cachavi... 



Venezuela: Rio Aurare 



Colombia: 



Barbacoas.-- 



Condoto, Choco 



Bolivia: Rosario 



Ecuador: 



Cachavi 



Mouth of the Curaray. 

 Peru: 



Puerto Indiana 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Costa Rica: 



Bebedero 



■ Do 



Number 



18216 P.M. 



18217 P.M. 

 105562 U.S.N. M. 



105661 



105662 



105664 



1.8.1.39 B.M. 



23808 A. M N.H. 



23809 A.M.N. H. 



98.3.4.11 B.M. 



98.3.4.12 



97.11.7.1 



18710 P.M. 



,34241 A.M.N.n. 



14. 5. 28. 32 B.M. 



238686 



97.11.7.1 B.M. 

 71644 A.M.N.n. 



73233 A.M.N.H. 

 73234 

 73235 

 73237 

 73238 

 73239 

 73240 

 73242 



95.8.17.20 B.M. 

 95. 8. 17. 21 



13.6 

 13.5 

 13.0 

 14.1 

 14.0 

 14.2 

 13.8 

 14.2 

 14.2 



14.2 

 14.2 

 14.0 

 14.1 



13.9 

 14.2 

 13.2 



14.0 

 13.8 



13.8 

 14.2 

 14.0 

 13.8 

 13.6 

 13.6 

 13.6 

 13.6 



14.4 

 14.0 



.2^ 



12.8 

 12.5 

 12.2 

 13.0 

 13.2 

 13.5 

 12.8 

 13.1 

 13.5; 8.8 



13.1 

 13.0 

 13.0 

 13.1 



■« a 

 — o 



o j- ^ a 



« o I'.S 

 rt « >- 



13.2 

 13.4 



12.6 



13.0 

 12.8 



12.8 

 13. 2| 



13. 0|. 

 12.8: 



12.81 

 12. 8i 



13.0;. 



12.8 



13.41 

 13.01. 



6.2 



5.0 



5.0 

 5.0 

 5.4i 

 5.2j 

 5.01 

 5.0! 

 5.2; 

 i 

 5.21 

 5.01 



10.7 

 9.7 

 8.9 

 10.0 

 10.4 

 10.3 

 10.0 

 10.1 

 10.3 



10.0 

 10.2 

 10.4 

 10.1 



10.2 

 10.0 

 9.6 



10.4 

 10.0 



9.6 



10.0 

 10.0 

 9.6 

 9.8 

 9.6 

 9.8 

 9.6 



10.0 

 10.0 



b^ 



Sa 



MYOTIS SIMUS Thomas 



Myotis simus Thomas, Ann. and Mag. Nat. Hist., ser. 7, vol. 7, p. 541, June, 

 1901. — Teouessart, Catal. Mamm. viv. foss., suppl., p. 95, 1904. — (Not 

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

 20, 1914, ^Myotis nigricans). 



Type locality. — Sarayacu, on the Ucayali Kiver, Loreto, eastern 

 Peru. 



Type specimen. — Female in alcohol, No. 81.5.12.2, British Museum 

 (Natural History), collected at Sarayacu, Peru, in 1876 by W. Davis. 



Distribution. — Amazonian drainage area of Ecuador, Peru, and 

 Brazil. Eange imperfectly known. 



Diagnosis. — A small species about the size of Myotis chiloensis 

 but differing from all members of the genus known to occur in 

 America by the following combination of characters: "Wing mem- 

 brane inserted at the ankle ; ear small, its tip usually extending about 

 halfway between eye and nostril when laid forward ; fur of a peculiar 

 dense woolly texture, the hairs on the back about 3.5 mm. in length ; 

 skull with unusually well-developed sagittal crest and broad anterior 

 portion of rostrum; mandible unusually heavy; distance between 

 upper canine and large premolar so reduced that the second small 



