1876.] mr. g. e. dobson on the molossi. 731 



17. Nyctinomus gracilis. 



Dysopes gracilis, Natt., Wagner, Wiegm. Archiv, 1843, p. 368 ; 

 Suppl. Schreb. Saugeth. v. p. 708 (1855). 



Xyctinomus yracilis, Peters, Monatsb. Akad. Berl. 1865, p. 573. 



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

 form of the ear-conch quite similar to that of N. maerotis; 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 ; 

 tragus very small, quadrate, outer margin concave. Muzzle and 

 remaining parts of the body as in N. maerotis. 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 J specimen) : head and body 2 f,, 5 ; tail 1"*5, 

 tail free from membrane 0"*7 ; head 0" # 9 ; ear 0"*75, tragus 0""1 

 x 0""08 ; forearm 1"'8 ; thumb 0"'3; second finger — metacarp. 1"*7, 

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

 0""65, 2nd ph. 0"'l ; fourth finger — metacarp. l" # 0, 1st ph. 0"'5, 

 2nd ph. 0"*15 ; tibia 0"5 ; foot and claws 0""35. 



Ilab. Brazil (Mato Grosso) ; Guatemala. 



Although much smaller and with comparatively shorter ears, this 

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

 at first sight, it appears to be a small variety of that species. On 

 closer examination, however, it is easily distinguished by the very 

 different form of the antitragus, and by the short connexion of the 

 ears in front. 



18. Nyctinomus brasiliensis. 



Nyctinomus brasiliensis, Is. Geoflfrov, Ann. des Sci. Nat. i. p. 337 

 (1824) ; Gervais, Expedit. de Castlenau, Zoologie, p. 60, pi. xii. figs. 2 

 and 2 a (teeth), 1855; Peters, Monatsb. Akad. Berl. 1865, p. 573. 



Xycticejus cynucephala, Le Conte, Cuv. Anim. Kingd. (M c Mur- 

 trie ed.) (1831), p. 431. 



Dysopes nasutus, Temminck, Monogr. Mamm. i. p. 234(1835). 



Nyctinomus multispinosus (Peale), Burmeister (vide Peters, /. c. 

 1865, p. 573). 



JIo/ossus cynocephalus etfuliginosus, Cooper, Ann. New-York Lye. 

 iv. 1837, pp. 65, 67. 



Rhinopoma carolinense, Gundlach, nee Geoffrov, Wiegm. Archiv, 

 1810, p. 358. 



Dysopes naso, Wagner, Supp. Schreb. Saugeth. i. p. 475 (1844); 

 v. p. 707 (1855)- 



Xyctinomus mexicanus, Saussure, Rev. et Mag. Zool. 1860, p. 283. 



Molossus aztecus, Saussure, I. c. p. 285*. 



Xyctinomus musculus, Gundlach, Monatsb. Akad. Berl. 1861, 

 p. 14!). 



Nyctinomus nasutus, Tomes, P. Z. S. 1861, p. 68 ; Allen, Mo- 

 nograph of the Bats of North America, p. 7 (1864). 



Ears nearly as long as the head, laid forward they extend almost 



* Prof. Peters informs me that Molossus aztecus, Saussure. included by him 

 in his subgenus Molossops ( = Myopterus), is really a synonym oi' N. brasiliensis, 

 as he has since ascertained by direct examination o( the type. 



