238 VESPEETILIONID^. 



Inc. -^, pm. ^^ ; wings from the base of the toes ; interfemoral mem- 

 brane hairy above. Sab. Nearctic Region. Subgen. Lasionyc- 



TBEIS. 



44. Vesperugo noctivagans. 



Vespertilio noctivagans, Leconie, Cuv. An. Kingdom, ed. M'Murtrie, 

 vol. i. App. p. 4.31, June 1831 ; Cooper, Annals lye. Neiv York, 

 1837, p. 59 ; Wagner, Suppl. Schreb. Sdugeth. v. p. 754 (1855). 



Vespertilio auduboni, Harlan, Amer. Month. Journ. Nov. 1831, 

 p. 220. 



Vespertilio pulverulentus, Temm. Monogr.Mamm. ii. p. 235 (1840). 



Scotophilus noctivagans, Allen, Bats of N. America, p. 39 (1864). 



Lasionycteris noctivagans, Peters, MB. Akad. Berl. 1865, p. 648. 



The extremity of the muzzle as fax back as the angle of the 

 mouth is nearly naked ; glandular prominences large, causing the 

 muzzle to appear very broad ; nostrils separated by a rather -wide 

 interval, which is slightly concave. Ears nearlj' as broad as long, 

 broadly rounded off above, with a straight outer margin reflected 

 backwards as in V. noctula, and terminating close to the angle of the 

 mouth ; the basal lobe of the inner margin has a small rounded pro- 

 jection at its commencement behind, which projects backwards and 

 appears to lie normally against the anterior and outer flat surface of 

 the tragus, the inner margin of which lies in the angle between thia 

 projection and the ear-conch. The tragus is broad, and roaches its 

 greatest width opposite the middle of the inner margin ; the inner 

 margin is straight, the outer has a small lobe at the base, succeeded 

 above by a concavity, above which the outer margin becomes very 

 convex (Plate XII. fig. 10, ear, slightly enlarged). 



Wings from the base of the toes ; feet rather small ; termination 

 of calcaneum indistinct, no postcalcaneal lobe ; tip of tail pro- 

 jecting. 



Fur, above, dark brown at the base, becoming very gradually 

 lighter towards the extremities of the hairs, the terminal one fourth 

 of which is silvery white, more conspicuous on the back ; the head 

 is brown throughout. Beneath, the fur of the neck is similar to that 

 of the head, and that of the abdomen to the back. The membranes 

 are almost black, the integument of the body and ears dark brown ; 

 the inner basal lobe of the ear is white, and this appears to be a 

 constant character in this species. 



On the upper surface the fur of the body extends upon the wing- 

 membrane as far as a line drawn from the middle of the humerus to 

 the ankle-joint ; the interfemoral membrane is covered for four fifths 

 its extent, a triangiilar terminal portion behind, containing the last 

 three vertebras of the tail, being alone naked ; beneath, the fur does 

 not extend so far upon the membranes; the wing-membrane is 

 covered thinly as far as a line joining the middle of the humerus and 

 the knee-joint, and the interfemoral has a few minute hairs only on 

 the part contained between the posterior limbs. 



The upper incisors are similar to those of V. pipistrellus ; the 

 inner ones with a second smaller cusp placed posteriorly and exter- 



