20 CHIROPTERA. 
1. Vesperugo serotinus. 
Vespertilio serotinus, Schreber, Saugth. i. p. 167, t. liii. (1775, ex Buffon) °. 
Vespertilio fuscus, Beauvois, Cat. Peale’s Mus. p. 14° (1796, descr. orig.; fide H. Allen, Mon. Bats 
N. Am. p. 31°). 
Vespertilio ursinus, Temminck, Mon. de Mamm. ii. p. 235 (1835-41, descr. orig.)*. 
Scotophilus ursinus, Tomes, P. Z. 8. 1861, p. 278°. 
Vesperus fuscus, Frantzius, Arch. f. Naturg. xxxv. i. p. 264°. 
Vesperugo serotinus, Dobson, Cat. Chir. Brit. Mus. p. 191". 
5 
Hab. Paumarctic, Ortentan, Eruiopian, and Nearcric Reetons?.—MeExico (Salle)®; 
Guatemata, Duefias (Salvin, Mus. Brit.67; Mus. Berol.); Costa Rica (Hoffman & 
Frantzius, Mus. Berol.6; Rogers, Mus. Brit.).—Wust Ivyv1ss ‘. 
Until lately the “Brown Bat” of North America has been regarded as a distinct 
species under the names of V. fuscus or V. ursinus, and has been considered to differ 
constantly from the well-known Serotine of the Old World in size, in colour, and in the 
amount of emargination of the outer margin of the ear-conch. But Mr. Dobson found 
that individuals collected by Mr. Salvin in Guatemala were absolutely undistinguishable 
from European examples. He was therefore led to make a careful examination of spe- 
cimens of V. fuscus from various parts of America, and came to the conclusion that the 
Transatlantic form could at most be regarded as a variety only of V. serotinus. The 
known range of this widely distributed Bat is therefore greatly extended, and now 
includes all the zoographical regions with the sole exception of the Australasian 7. 
In North America the Serotine is found throughout the temperate and warmer 
regions. Its southward range extends throughout Central America, at least as far as 
Costa Rica, where Dr. v. Frantzius says it is not rare®, and whence Messrs. Godman 
and Salvin have received specimens now in the British Museum. It has not yet been 
recorded from Panama, nor from any part of the South-American continent, although 
it is common in some of the West-Indian islands’. 
2. Vesperugo propinquus. 
Vesperus propinquus, Peters, Monatsb. Ak. Berl. 1872, p. 262 (descr. orig.). 
Vesperugo propinquus, Dobson, Cat. Chir. Brit. Mus. p. 203°. 
Hab. Guatemata, Yzabal (Sivers, Mus. Berol. 3). 
This species is very nearly allied to the Northern Bat of Europe, V. borealis (Nilsson), 
from which it is distinguished by Professor Peters by the different form of the ear-conch 
and by the dentition, the outer upper incisors being smaller than the inner in cross 
section at the base, and the lower incisors placed in a regular series parallel to the line 
