﻿104 



NORTH AMERICAN FAUNA. 



[Note. — The following species is not represented in any of the extensive collections 

 of "i);it.s recently made in Mexico. As I have never seen the animal and hence can 

 foiin nn opinic u as to" the \vcioht of its cliaracters, I ha\ (' not attempted to include 

 it in the synojisis of tlie North Ann-rican forms of VtsperllVio. Dohson's description, 

 based on an examination of the type, may he introduced here, however, as an aid 

 to the reeuguition of the species.] 



YKSPERTILIO ALBIGULARIS (Peters). 

 lt^72. Vvsperns {Mars'ipoUemus) aJhlgularla Peters, Monatsher. K. Akad. Wiss., Berlin, 

 p. 260. 



1878. J'es2)erHgo aJhUjularis Dohson, Catal. Chiroptera Brit. Mus.. y>. 207. 



"Ears veiy broad and broadly rounded off above; the lower half of 

 the outer margin of the ear conch broadly folded backwards, as in T^. 

 noctula, separated in front from the angle of the mouth by a wart, hut 

 terminating heJou: and internal to it under the Io7verja/r hy a small inter- 

 nal prolongation; tragus broad above, attaining its greatest width above 

 the middle of the inner margin, which is slightly concave, narrowest 

 opposite the base of the inner margin, a prominent triangular lobe at 

 the base of the outer margin. Nostrils rather wide a])art. opening sub- 

 laterally : nmzzle broad and obtuse : crown of the head scarcely elevated 

 above the face line. 



"'Wings from the base of the toes: postcalcaneal lobe long and nar- 

 row; last caudal vertebra free. 



"Fur dark brown above, the extreme tips hoary, as in T^. noctivagann, 

 paler beneath, the chin and throat, as fiir back as a line connecting tbe 

 posterior margins of the e^Y§^. pure ivhlte. 



"Upper inner incisors long and broad and slightly bifid at their 

 extremities: outer incisors very short, shortly exceeding the cingulum of 

 the inner ones in vertical extent: the single upper premolar close to the 

 canine: lower incisors in the direction of the jaws: first lower premolar 

 half the size of the second, which exceeds the molars in vertical extent. 



"Length (of the type specimen, an adult i ), head and body 2''.35 

 [5l7 mm], tail [38 mmj, head O'M [17.8 mm], ear 0" M x 0".13 

 [16.5 mm x 5.8 mml. forearm 1" .(So [11. 9 mm], thumb 0".35 [8.9- mm], 

 third finger 2''.75 [60.8 mm], fifth finger 2^' [50.8 mm], tibia 0".6 [15.2 mm], 

 foot 0''.35 [8.9 mm]. 



'-Hah. — 31exico. Type in the collection of the Berlin Museum. 



'•This species may be at once distinguished from all other species of 

 Yeapertilionido: by the very peculiar manner in which the outer margin 

 of the ear-conch terminates under the jaw. which has caused tlu^ 

 deseriber, Dr. Peters, to make it the type of a new subgenus, Marsip-i 

 la:m us. In the prolongation of the ear conch, in the form of the ti agus, 

 and in dentition it resembles the African species of Chalinolohus." 



General remar'ks. — This species is very different from any of thos 

 recently collected in Mexico, and is probably well worthy of subgeueric 

 or even generic separation from Vespertiiio. Its characters are so 

 remarkable and 3Iexico has recently been so thoroughly explored that 

 doubt is thrown on the accuracy of Peters: information concerning the 

 type locality. 



