2 BIOLOGICAL SOCIETY OF WASHINGTON. 



The following characters will serve to distinguish the species- 

 from its allies : 



VESPERTILIO CILIOLABRUM* sp. nov. 

 (Type No. 2797 female ad., Merriam Collection). 



: 2-2, ^ i-i, 3-3, ^^^ 3-3, ^^S 



3-3 ■ 3-3 20 



Dental fortmila: i. — ,— c. ' pm. ^-•^~ m.-^-^' ;= — ==38. 



-^ 6 i-i ^ x-x -x-x 20 ^ 



The outer upper incisor of each side slopes forward and 

 inward parallel to the inner, contrary to the rule in the genus 

 Vespcrtllio, in which these teeth usually are divergent ; cusp 

 of inner upper incisor bifid, the anterior point being larger. 

 First upper premolar small and crowded against (and usually 

 somewhat internal to) the canine ; second upper premolar 

 minute and wholly internal to the tooth-row so that it is not 

 visible from the outside except in immature individuals ; third 

 premolar very large, nearly or quite equal to canine. Middle 

 lower premolar smallest ; posterior largest. 



Sides of upper lip fimbriate. Glandular prominences be- 

 tween eyes and nostrils moderately developed. Tip of ear 

 laid forward extends to end of muzzle. 



The calcaneum reaches about half-way from the foot to the 

 tip of the tail ; the postcalcaneal lobule is large for a Ves- 

 pertilio ; the calcaneum ends in a projecting tooth or lobule. 



The form of the ear is somewhat intermediate between that 

 of V. nitidus and that of V. fzigricaiis : Internal basal lobe 

 slightly rounded ; middle three-fourths of anterior margin 

 strongly convex ; tip shortly rounded oft', forming a small, pro- 

 jecting lobe posteriorly, beneath which the outer, border is 

 sharply emarginated for about one-third of its entire length ; 

 bottom of emargination straight or slightly convex ; below this 



*The specific name ciliolabrum refers to the fringe of hairs along the 

 sides of the upper lip. 



