216 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
Upper incisor (i 2 ) larger, its shaft unicuspid, but the cingalum pro- 
duced into a conspicuous cusplike heel directed backward and out- 
ward and occupying much the same position as the outer tooth of 
Eptesicus ; m 3 with practically no trace of mesostyle or metacone, 
the short commissure extending back from paracone directed inward 
instead of outward ; lower teeth as in Eptesicus , except that the 
incisors are bicuspid and very slightly imbricated. 
Species examined. — Otonycteris hemprichii Peters and 0 . petersi 
Anderson and de Winton. 
Remarks. — Though readily distinguishable from its allies by the 
details of its characters, but especially by the greatly enlarged audital 
bullae, this genus appears to be closely related to Eptesicus , Scoteinus , 
Scotomanes , and others with the auditory apparatus not specially 
modified. Its likeness to Plecotus is evidently more superficial than 
real, as the nostrils are strictly of the Vespertilionine type. 
Genus NYCTICEIUS Rafinesque. 
1819. Nycticeius Rafinesque, Journ. de Physique, LXXXVIII, p. 417. 
June, 1819. 
1827. Nycticeus Lesson, Man. de Mammal., p. 98r 
1827. Nycticejus Temminck, Monogr. de Mammal., I, p. XVIII. 
1830. Nycticeyx Wagler, Natiirl. Syst. der Ampli, p. 13. 
1831. Nycticea Le Conte, MeMurtrie’s Cuvier, Anim. Kingd., p. 432. 
1878. Nycticejus Dobson, Catal. Chiropt. Brit. Mus., p. 266. 
1894. Nycticejus PI. Allen, Monogr. Bats N. Amer. (1893), p. 131, March 
14, 1894. 
1897. 'Nycticeius Miller, North Amer. Fauna, No. 13, p. 118, October 16, 
1897. 
Type-species. — Nycticeius liumeralis Rafinesque. 
Geographic distribution.- — Southeastern United States; Cuba. 
Number of forms. — Two species are known. 
Characters. — External and cranial characters as in Eptesicus. 
Dental formula : 
-2 - . 1. 4 5 6 7 .Ul 
1 2 3. 1.-2-4 5 6 7 ^3-3' 
1-1 
1 - 1 ’ 
jpm 
1-1 
2 - 2 ’ 
m 
3-3 
3-3 
= 30. 
Upper incisor simple, unicuspid, nearly half as high as canine, wdth 
which it is in contact or nearly so. Lower incisors as in Eptesicus , 
the outer larger than either of the others. Upper premolar without 
cusp on inner side. Canines, molars, and lower premolars as in 
Eptesicus; m 3 with crown area more than half that of m 1 or m 2 , 
its mesostyle, metacone, and three commissures well developed. 
Species examined. — Nycticeius humeralis (Rafinesque) and N. cu- 
banus (Gundlach) 
