121 On a new Bat from Lower California. 



XVI T. — Description of a new Bat from Lower California. 

 By Gerrit S. Miller, Jr. 



Mr. Oldfield Thomas has recently sent me for determination 

 ten bats of the genus Myotis, taken in the extreme southern 

 part of Lower California, and forming part of the Coolidge 

 collection, which has already furnished so many novelties. 

 Four of the specimens — three from Santa Anita and one from 

 San Jose" del Cabo, the latter essentially a topotype of 

 Vespertilio obscurus, H. Allen — prove to be typical Myotis 

 califbrnicus ; the others, all from San Jose" del Cabo, repre- 

 sent a species related to M. velifer, J. A. Allen, but distinct 

 from any hitherto described. The new form may be known 

 as 



Myotis peninsular is, sp. n. 



Type adult ? (skin and skull), in the British Museum *, 

 collected at San Jose* del Gabo, Lower California, August 12, 

 1896, by Loye Miller. Coolidge collection, number 718. 



Specific Characters. — Skull and teeth essentially as in 

 Myotis velifer, J. A. Allen. General size considerably 

 smaller than in M. velifer (about the same as in M. lucifuyus) 

 and tail-vertebras relatively much shorter. Colour (in tawny 

 phase) paler and more fulvous than in M. velifer and closely 

 resembling that of M. californicits and M. thysanodes. 



Colour. — The specimens represent two distinct colour 

 phases. In the type and two other females the whole body 

 is wood-brown, the back slightly darker than Ridgway's 

 plate ('Nomenclature of Colours,' pi. iii. fig. 19), the belly as 

 much paler. In the three other specimens, all of which are 

 males, the back is hair-brown and the belly pale Isabella 

 colour. One of the males, however, is clearly intermediate 

 in colour, so that it is unlikely that the phases are purely 

 sexual. 



Skull and Teeth. — The skull and teeth exactly resemble 

 those of Myotis velifer, except that they are a trifle smaller in 

 size. The skull of the type measures : greatest length 1 5 mm. j 

 zygomatic breadth 10 ; interorbital constriction 3*8 ; breadth 

 of rostrum at anterior root of first molar 6 ; mandible 118 ; 

 upper tooth-row (exclusive of incisors) 6*4 ; lower tooth- 

 row 8. 



Measurements. — Type: total length 91 mm. ; tail 34; tibia 

 14-6; foot (with claws) 10; forearm 39; longest finger 61; 



* [Since registered as 98. \ 1. 50.-0. T.] 



