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Show (j ZOOLOGY OF TIIE VOYAGE OF TilE BEAGLE. long, and of an uniform rich brown colour, and extends on to the base of the interfemoral membrane above and below; the remainder of this membrane is bare, and, together with that of the wings, of a black colour. In. Lines. In. Lines. 0 Length of the head and body tho tail 1 1 8 3! Length of tho tragus 3b tho antibrachium 1 5~ tho thumb (claw included) 0 2~ Expanse of tbo wings . Length of the car Habitat, Chiloe. (Janua?y.) 8 0 3 5t tho tibin. 0 6~ "This specimen was given me by Lieut. Sulivan, who obtained it amongst the islets on the Eastern side of Chiloe. It is not, I believe, common, nor do the humid and impervious forests of that island ap1)ear a congen ial habitation for members of this family. It must, however, be observed, that even in Tierra del Fuego, where the climate is still less hospitable, and where the number of insects is surprisingly small, I saw one of these animals on the wing." D. FAMILY-NOCTILIONID.lE. DvsoPES NASUTUS. l\1olos us nasutus Spi.'l, Simiarum ct Vcspcrtilionum. BrazilicnRium species uovre. Nyctinomus Drnzilicu is.-Geojfi·oy, Annales ucs Sciences N aturellcs, tom. i. p. 337. pl. 22. Or· this species I find three specimens in Mr. Darwin's collection-" 1 t is remarkable," says Mr. Darwin, "for its wide geographical range. I obtained specimens at Maldonado, on the northern bank of the Plata, where it was exceedingly numerous in the attics of old houses, and likewise at Valparaiso in Chile. Molina (vol. i. p. 301.) says another species is found in Chile, of the same size and figure, but of a more orange (nam1ljado) colour." Up.on comparing the dimensions of several specimens of this species with those given by Temminck in his " Monographic sur le Genre Mo1osse," 1 find t~at they vary very considerably ; I shall therefore be adding some little to the h~story of the species, by giving the dimensions of those now before me, together With. the sexes of the specimens measured, and their localities. In all these specimens there is a series of pointed tubercles along the upper margin of the ears, a character which M. Temminck has omitted to notice. They vary slightly |