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Show 1876.] MR. G. E. DOBSON OTV T H E MOLOSSI. 7-31 17. NYCTINOMUS GRACILIS. Dysopes gracilis, Natt., Wagner, Wiegm. Archiv, 1843, p. 368 ; Suppl. Schreb. Saugeth. v. p. 708 (1855). Nyctinomus gracilis, Peters, Monatsb. Akad. Berl. 1865, p. 573. 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 ; tragus very small, quadrate, outer margin concave. Muzzle and remaining parts of the body as in N. macrotis. N o 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 <5 specimen) : head and body 2''*5 ; tail 1"*5, tail free from membrane 0"*7 ; head 0 "*9 ; ear 0"*75, tragus 0"1 x0"*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"*1 ; fourth finger-metacarp. 1"*0, 1st ph. 0""5, 2nd ph. 0"*15 ; tibia 0"5 ; foot and claws 0"*35. Hab. Brazil (Mato Grosso) ; Guatemala. Although much smaller and with comparatively shorter ears, this species resembles N. macrotis 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. Geoffroy, Ann. des Sci. Nat. i. p. 337 (1824) ; Gervais, Expedit. de Castlenau, Zoologie, p. 60, pl. xii. figs. 2 and 2 a (teeth), 1855; Peters, Monatsb. Akad. Berl. 1865, p. 573. Nycticejus cynocephala, Le Conte, Cuv. Anim. Kingd. (McMur-trieed.) (1831), p. 431. Dysopes nasutus, Temminck, Monogr. M a m m . i. p. 234(1835). Nyctinomus multispinosus (Peale), Burmeister (vide Peters, /. c. 1865, p. 573). Molossus cynocephalus etfuliginosus, Cooper, Ann. New-York Lye. iv. 1837, pp. 65, 67. Rhinopoma carolinense, Gundlach, nee Geoffrov, Wiegm. Archiv, 1840, p. 358. Dysopes naso, Wagner, Supp. Schreb. Saugeth. i. p. 475 (1844); v. p. 707 (1855). Nyctinomus mexicanus, Saussure, Rev. et Mag. Zool. 1860, p. 283. Molossus aztecus, Saussure, I. c. p. 285*. Nyctinomus musculus, Gundlach, Monatsb. Akad. Berl. 1861, p. 149. Nyctinomus nasutus, Tomes, P.Z.S. 1861, p. 6 8 ; Allen, M o 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 m e that Molossus aztecus, Saussure, included by him in his subgenus Molossops ( = Myopterus), is really a synonym of N. brasiliensis, as he has since ascertained by direct examination of the type. |