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Show 334 MR. O. THOMAS ON MAMMALS FROM CENTRAL PERU. [Apr. 18, 1. NYCTIPITHECUS TRIVIRGATUS. a, b. Ad. sks. <$ $ . Chanchamayo. 5/9/90. 2. YESPERUS EUSCUS, P. de Beauv. a. Ad. al. <3 . Chanchamayo. 3. SACCOPTERYX LEPTURA, Schr. a. S al. Chanchamayo. 4. SACCOPTERYX BILINEATA, Temm. a, b. 2 S al. Chanchamayo. As Dobson has remarked, these two species of Saccopteryx seem to be merely large and small races of a single form, exactly as in Molossus rufus and M. obscurus. The difference in size, however, is, in the one case as in the other, so great and so constant as to make it convenient to treat them all as distinct species so far as nomenclature is concerned. 5. MOLOSSUS OBSCURUS, Geoffr. a-e. 5 in al. Central Peru. 6. NYCTINOMUS KALINOWSKII, sp. n. (Plate XXIX. fig. 10.) Size very small, perhaps the smallest of the genus in the general bulk of the body. Lips slightly wrinkled. Ears not conjoined in front, but arising from the same point on the muzzle; their substance very thin and transparent; their inner margin evenly but faintly convex, without minute horny points ; tip rounded off, but fairly defined, not lost in the general convexity, as is often the case; outer margin slightly convex for its upper, concave for its middle, and convex again for its lower third, but the curves are very slight and open, and there is practically no antitragus at all, the notch marking this lobe behind being almost obsolete; as a general result the line of the conch runs almost evenly from the tip to the insertion behind the angle of the mouth, a character, I believe, unique in the genus. Keel of ear-conch very much reduced, and forming a mere narrow rim, barely a millimetre broad at its broadest point; its edge not thickened or bent round in any way. Tragus well developed, quadrangular, its upper nearly equal to its inner edge. N o trace of a gular sac, at least in the female. Wing-membrane from the ankle. Eur very short and close, extending on the upper surface of the wing-membrane only as far outwards as a line drawn from the middle of the humerus to the middle of the femur; a few minute scattered hairs behind the forearm. Colour pale fawn-grey, rather paler below than above ; wing-membranes black, edged posteriorly with white. Membrane of ears whitish. Teeth too much worn down in the type for proper description |