NYCTINOMUS. 33 
5. NYCTINOMUS. 
Nyctinomus, Et. Geoffroy, Descr. de Egypte, ii. p. 114 (1812). 
Dinops, Savi, N. Giorn. de’ Lett. p. 230 (1825). 
The genus Nyctinomus is very closely allied to Molossus, but is distinguished by the 
truncated tragus and vertically grooved upper lip, as well as in the imperfect ossifica- 
tion of the intermaxillaries and the consequent separation of the upper incisors, which 
are placed close to the canines. It also differs markedly in geographical distribution ; 
for, instead of being confined to the Neotropical Region, its members are dispersed over 
the warmer portions of both hemispheres. Three or four species are American, two of 
which have been found within our limits, namely :— 
1. WV. gracilis. Incisors 4; ears united at base by a low band, antitragus not 
longer than high. Forearm 1"°80. Fur dark brown. 
2. N. brasiliensis. Incisors 2; ears not united, tragus quadrate. Forearm 1!"70. 
Fur dark fawn above, lighter below. 
1. Nyctinomus gracilis. 
Dysopes gracilis (Natterer), Wagner, Arch. f. Naturg. ix. 1, p. 368 (1843, descr. orig.)*. 
Nyctinomus gracilis, Peters, Monatsb. Ak. Berl. 1865, p. 573°; Dobson, P. Z. 8. 1876, p. 731°; 
Cat. Chir. Brit. Mus. p. 436, pl. xxii. fig. 7°. - 
Hab. Guaremata, Duefias (Salvin, Mus. Brit.*), Peten (Salvin, Mus. Berol.); Panama‘. 
—Ecuapor‘; Braziw. . 
This species is very nearly allied to the Brazilian NV. macrotis, Gray ; but Mr. Dobson. 
points out that it may be easily distinguished, irrespective of its smaller size, by the 
lowness of the band which connects its ears and by the very different form of the anti- 
tragus. First discovered in Brazil, its range extends to Guatemala, where Mr. Salvin 
obtained it at Duefas and at Peten. 
2. Nyctinomus brasiliensis. 
Nyctinomus brasiliensis, Is. Geoffroy, Ann. Sc. Nat. i. p. 337 (1824, descr. orig.)'; Peters, Monatsb. 
Ak. Berl. 1865, p. 5737; Frantzius, Arch. f. Naturg. xxxv. 1, p. 263°; Dobson, P. Z.S. 1876, 
p.781*; Cat. Chir. Brit. Mus. p. 437, pl. xxii. fig. 8°. 
Nyctinomus nasutus, H. Allen, Mon. Bats N. Am. p.7 (nec Spix)’. 
Molossus mexicanus, De Saussure, Rey. et Mag. de Zool. 1860, p. 283, pl. xv. fig. 2 (descr. orig.)’. 
Molossus aztecus, De Saussure, tom. cit. p. 285, pl. xv. fig. 3 (descr. orig.)°. 
? Dinops, sp., Dugés, La Nat. i. p. 187°. 
Hab. N. America(from California) °,—Mextco, Coffre de Perote, Amecameca ( Saussure?) 
BIOL. CENT.-AMER., Mamm. Vol. 1, Nov. 1879.  -F 
