No. 2.] Allen on a New Species of Bat, 197 



presents nothing peculiar. The lower jaw is narrow, the coronoid process small, 

 rising but little above the condyle ; the angle is well developed. 



The dentition is weak, the incisors and canines being very small, relatively 

 to the molar series. The outer upper incisor is about one-half the size of the 

 inner ; both have a small outer cusp at the base. The upper canine is about 

 equal in size to the anterior half of the upper premolar. The molars present 

 nothing distinctive. The lower incisors are slightly double-notched (trifid) ; the 

 lower canines are very small ; the first premolar is about half the size of the 

 second. 



The present species appears to bear a general resemblance to 

 Histiotus velatus and H. macrotus of Brazil and Chili, as regards 

 general size and the form and size of the ears. It is, however, 

 larger than either, with the ears relatively as large as in H. macrotus, 

 and differs from both in the form of the tragus, which instead of 

 being narrowed apically and subacutely pointed, is broad towards 

 the tip and obtusely rounded. In H. macrotus, according to Dr. 

 Peters,* the outer upper incisor is minute as compared with the 

 inner, while in the present species the upper incisors are compara- 

 tively subequal. There is also a striking difference in coloration, 

 the present species being particolored, black and white, the others 

 yellowish brownf above and whitish gray below. 



The coloration of the present species is striking and almost 

 unique among bats. The white patches are possibly in part due 

 to albinism, but this does not seem at all probable. The spots 

 are symmetrical in form and position, and the white is confined to 

 the surface, the under fur being blackish, like the under fur on 

 the rest of the body, whereas in white spots due to albinism the 

 white extends to the base of the fur. 



Explorations recently made in Southern California present in 

 striking relief the ignorance of its mammalian fauna which pre- 

 vailed to within a recent date, and warrant the supposition that 

 further novelties still await discovery. Just three years ago Dr. 

 Merriam described from San Bernardino County a new fox 

 ( Vulpes macrotis) \ with remarkably large ears, and very unlike 

 anything previously known from North America. The species 

 was based on a single specimen, but subsequently others were 



* Monatsb. Akad. Wissen. Berlin, 1875, p. 788, pi., fig. 2. 



t Proc. Biol. Soc. Washington, Vol. IV, 1886-88, pp. 5-7. Extras issued Feb. 18, 1888. 



