THE FAMILIES AND GENERA OF BATS. 209 



m 2 with hypocone always indicated and in some species well de- 

 veloped, a distinct concavity between it and protocone ; m 3 variable 

 in form, usually with well developed metacone and three commis- 

 sures in the smaller species, but with metacone and third commis- 

 sure obsolete in the larger forms; lower molars with all the cusps 

 present and of normal form. Skull not essentially different from 

 that of Pipistrellus, the rostrum flattish or more usually rounded 

 off above, the nares and palatal emargination not specially enlarged, 

 the latter at least as deep as wide. Externally as in the related 

 genera. 



Species examined. — Eptesicus capensis (Smith) and related forms, 

 E. serotinus (Schreber), E. platyops (Thomas),^, megalurus (Tem- 

 minck), E. matroka (Thomas and Schwann), E. rendalli Thomas, 

 E. hillarii ( Geoff roy), E. dorianus (Dobson), E. minutus (Tem- 

 minck), E. matschiei Thomas, E. tenuiphi,nis (Peters), E. nilssoni 

 (Keyserling and Blasius), E. fuscus (Beauvois) and related forms. 



Remarks. — Notwithstanding the great difference in size between 

 such species as Eptesicus pachyornus and E. pumilus, the characters 

 of the genus are very constant. In the smaller forms the skull is 

 more slender and Myotis-like and the last upper molar is better de- 

 veloped, while in the larger species the skull is more angular. 



Genus VESPERTILIO Linnaeus. 



1758. Vespertilio Linn^us, Syst. Nat, I, 10th ed., p. 31 (murium). 



1839. Vesperugo Keyserling and Blasius, Wiegmann's Archiv. fiir Natur- 

 geschichte, 5ter Jahrg., I, p. 312 (part). 



1839. Vesperus Keyserling and Blasius, Wiegmann's Archiv. fiir Natur- 

 geschichte, 5ter Jahrg., I, p. 313. Subgenus of Vesperugo (part). 



1856. Meteorus Kolenati, Allgem. deutsch. natnrhist, Zeitung, Dresden, 

 neue Folge, II, p. 131 (part; included nilssoni, "discolor "=murinuB, 

 savii, leucippe, and aristippc). 



1863. "Aristippe Kolenati, Beitrage zur Kenntniss der Phthiriomyiarien, 

 Petersburg, 1863" (part: included both murinus and nilssoni). 



1872. Marsipolwmus Peters, Monatsber. k. preuss. Akad. Wissensch., Ber- 

 lin, p. 260 (subgenus of Vesperugo for albigularis=murinus) . 



1878. Vesperus Dobson, Catal. Chiropt. Brit. Mus., p. 183 (subgenus of 

 Vesperugo), part. 



1897. Vespertilio Miller, Ann. and Mag. Nat. Hist, 6th ser., XX, p. 384. 

 October, 1897 (part). 



1897. Vespertilio Miller, North American Fauua, No. 13, p. 95, October 

 16, 1897 (part). 



1900. Vespertilio Mehely, Monogra. Chiropt. Hungarian, p. 219 (part: in- 

 cluded both murinus and " horealis " =nilssoni) . 



Type-species. — Vespertilio murinus Linnaeus. 



Geographic distribution. — Northern portions of Europe and Asia. 



25733— No. 57—07 M 14 



