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 s 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. 98. 

 1827. Nycticejus Temminck, Monogr. de Mammal., I, p. XVIII. 



1830. Nycticeyx Wagler, Natiirl. Syst. der Amph, p. 13. 



1831. Nycticea Le Oonte, McMurtrie's Cuvier, Anim. Kingd., p. 432. 

 1878. Nycticejus Dobson, Catal. Chiropt. Brit. Mus., p. 266. 



1894. Nycticejus II. 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 humeralis Rafinesque. 

 Geographic distribution. — Southeastern United States; Cuba. 

 Number of forms. — Two species are known. 



Characters. — External and cranial characters as in Eptesicus. 

 . Dental formula : 



ZA". 1. ---4567 .1-1 1-1 1-1 3-3_„ n 



1 2 3. 1. -2-4 5 6~7 *3-3' \-V P " 1 2=2' m 3=3 



Upper incisor simple, unicuspid, nearly half as high as canine, with 

 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) 



