208 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
1839. Vesperus Iveyserling and Blasius, Wiegmann’s Archiv. fur Natur- 
geschichte, 5ter Jahrg., I, p. 313 (subgenus of Vesperugo, part). 
1841. Noctulci Bonaparte, leonogr. Fauna Ital., fasc. XXI, in account of 
Yespertilio alcythce ( serotinus ). 
1856. Cateorns Kolenati, Allgem. deutsch. naturbist. Zeitung, Dresden, 
neue Folge, II, p. 131 ( serotinus ). 
1856. Meteorus Kolenati, Allgem. deutscb. naturbist. Zeitung, Dresden, 
neue Folge, II, p. 131 (part). 
1858. Amblyotus Kolenati, Sitz. ber. kais. Akad. Wissenscb., Wien, Math. 
Naturwissensch, Classe, XXIX, p. 252 (atratus=nilssoni ) . 
1863. “ Aristippe Kolenati, Beitriige zur Kenntniss der Phthiriomyiarien, 
Petersburg, 1863” (part; included both discolor =murinus and nilssoni). 
1864. Scotophilus H. Allen, Monogr. Bats N. Amer., p. 27, June, 1864 
(part). 
1866. Pacliyomns Gray, Ann. and Mag. Nat. Hist., 3d ser., XVII, p. 1 90. 
February, 1866 ( pachyomus ). 
1870. N yctiptenus Fitzinger, Sitz. ber. kais. Akad. Wissensch., Wien, Math. 
Naturwissensch., Classe, LXII, p. 424 ( smithii ). 
1878. Vesperus Dobson, Catal. Chiropt. Brit. Mus., p. 184 (subgenus of 
Vesperugo) part. 
1892. Adelonycteris II. Allen, Proc. Acad. Nat. Sci. Philadelphia, 1891, 
p. 466, January 19, 1892 (part: substitute for Vesperus, preoccupied). 
1894. Adelonycteris H. Allen, Mongr. Bats N. Amer. (1893), p. Ill, March 
14, 1894. 
1897. Vespertilio Miller, Ann. and Mag. Nat. Hist., 6th ser., XX, p. 384, 
October, 1897 (part). 
1897. Vespertilio Miller, North American Fauna, No. 13, p. 95, October 16, 
1897 (part). 
1900. Eptesicus Mehely, Monogr. Chiropt. Hungarise, p. 219 (part: in- 
cluded both murinus and l)orealis=nilssoni ) . 
1900. Eptesicus Mehely, Monogr. Chiropt, Hungarlse, p. 206. 
Type-species. — Eptesicus melanops=V espertilio fuscus Beauvios. 
Geographic distribution. — Africa, Madagascar, Australia, Asia 
(except Malay region) ; America from southern Canada southward 
(except Lesser Antilles). 
Number of forms. — About 45 species of V espertilio are now known. 
C haracters.— Dental formula : 
- 2 3. 1. 4567.2-2 1-1 1-1 3-3 
1 2 3. 1. - 2 - 4 5 6 7 * 3 - 3’ c: 1 - V pm 2-2’ m 3 - 3~ 32- 
Teeth strictly normal throughout and showing no special pecul- 
iarities. Both upper incisors well developed, the inner larger than 
the outer and usually with distinct secondary cusp, the outer sep- 
arated from canine by a space equal to its greatest diameter. Lower 
incisors subequal, trifid, the crown of the third wider than that of 
either the first or second. They are closely crowded and distinctly 
imbricated, forming a strongly convex row between canines. 
Canines simple, with distinct cingulum, but no secondary cusps, 
Premolars with no special peculiarities. Molars normal; m 1 and 
