436 



EMBALLONTJRID^. 



Thumb rather short, with a small callosity ; terminal phalanx of 

 third finger very short. Wiugs from the distal third of the tibiae. 



Fur short, reddish brown above and beneath ; on the upper 

 surface extending upon the wing-membrane as far outwards as a 

 line drawn from the middle of the humerus to the knee-joint, on 

 the base of the interfemoral, and outwards behind the forearm in a 

 narrow band to the carpiis. 



Teeth slender, with very acute cusps. Lower incisors four, 

 crowded, bifid. Fu"st upper premolar small, but acutely pointed, in 

 the centre of the space between the canine and second premolar ; 

 second premolar large, with a long and very acute internal basal 

 cusp. 



Length (of the type specimen, an adult $ ), head and body 2"-8, 

 tail l"-9, tail free from membrane 1", head l"'l, ear 1", tragus 0"-15 

 xO"-l, forearm 2"-2, thumb 0"-3 ; third finger — metacarp. 2"-l, 

 1st ph. 0"-9, 2nd ph. 1" ; fourth finger — metacarp. 2", 1st ph. 

 0"-75, 2nd ph. 0"-l; fifth finger— metacarp. 1", 1st ph. 0"-7, 2nd 

 ph. 0"-3; tibia 0"-65, foot 0"-4. 



Hab. Cuba ; Brazil (Mato Grosso) ; Paraguay. 



a. $ ad., al. (type). Cuba. W. S. MacLeay [P.]. 



The next species, N. r/racilis, resembles B'. macrotis very closely 

 in general structure, and forms with it a separate section of the 

 genus, distinguished by the peculiar shape of the muzzle. 



17. Nyctinomus gracilis. 



Dysopea gracilis, Natt., Wagner, Wicym. Archiv, 1843, p. 368 ; 



Stijyyl. Schreb. Sciugeth. v. p. 708 (1855). 

 Nyctinomus gracilis, Peters, MB. Akad. Berl. 1805, p. 573 ; Dohson, 



P. Z. S. 1876, p. 731. 



Ears conjoined by the bases of their inner margins only ; general 

 form of the ear-conch quite similar to that of N. macrotis, but the 

 antitragus is higher than long, separated posteriorly by a very deep 

 notch, and terminating abruptly in front near the angle of the 

 mouth (Plate XXII. fig. 7): tragus very small, quadrate, outer 

 margin conc'ave. Muzzle and remaining parts of the body as in N. 

 macrotis. No gular sac. 



Fur short, dark brown above and beneath, extending upon the 

 wing-membranes along the sides of the body only. 



•Length (of an adult S specimen), head and body 2"-5, tail l"-5, 

 tail free from membrane 0"-7, head 0"-9, ear 0"-75, tragus 0"-l x 

 0"-08, forearm l"-8, thumb 0"-3 ; third finger — metacarp. l"-7, 

 1st ph. 0""75, 2nd ph. 0"'9 ; fourth finger — metacarp. 1"'65, 

 1st ph. 0"-65, 2nd ph. 0"-l ; fifth finger— metacarp. 1", 1st ph. 

 0"-5, 2nd ph. 0"-15 ; tibia 0"-5, foot 0"-35. 



Hah. Brazil (Mato Grosso) ; Ecuador ; Central America (Guate- 

 mala, Panama). 



Although much smaller, and with comparatively shorter ears, this 

 species resembles N. macrotis so closely in its general structure that, 



