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Show 732 MR. G. E. DOBSON ON THE MOLOSSI. [Nov. 7, to the end of the nose ; inner margins not united, but arising close together from the muzzle about midway between a line drawn between the eyes and the extremity of the nose; inner and outer margins of the "ear-conch almost regularly convex, continuous ; the inner margin with five or six minute horny projections ; antitragus but slightly developed, separated posteriorly by a shallow and small notch ; tragus quadrate, larger than in N gracilis. Upper lip with numerous vertical wrinkles ; muzzle in front of the origin of the inner margins of the ears flat, terminated by the sharply cut margins of the nostrils. No gular sac. Wings from the distal third of the tibiae near the ankles. Fur moderately long and very dense, extending upon the wings above and beneath as far outwards as a line drawn from the middle of the humerus to the knee, the remainder naked. Lower incisors six, crowded ; the outer incisors very slender, overlapping the external margin of the middle incisors, the internal margins of which are also overlapped by the central incisors; first upper premolar small, with an acute cusp well elevated above the gum in the centre of the small space between the canine and second premolar. Length (of an adult 2 ) : head and body 2"*25; tail 1"*4, tail free from membrane 0"*8 ; head 0"*8 ; ear 0"*7, tragus 0"* 15 x 0"*12; forearm 1"7 ; thumb 0"*3 ; second finger-metacarp. i"*65, 1st ph. 0"*65, 2nd ph. 0"*8; third finger-metacarp. 0"*65, 1st ph. 0"*55, 2nd ph. 0"*45 ; fourth finger-metacarp. 0"*8 ; 1st ph. 0"*5, 2nd ph. 0"*25 ; tibia 0"*5 ; foot and claws 0"*33. Hab. The warmer regions of North and South America and their islands, extending from California to Chili; apparently everywhere distributed throughout the tropical and subtropical parts of America, where it is probably the most common species of the genus, as it has the widest range. 19. NYCTINOMUS NORFOLCENSIS. Molossus norfolcensis, Gray, Ann. Nat. Hist. iv. p. 7 (1839). Nyctinomus planiceps, Peters, Monatsb. Akad. Berl. 1866, p. 22. Molossus wilcoxii, Krefft, List of Australian Bats (1871). Ears triangular, shorter than the head, separate, their inner margins arising from distinct points of origin; inner margin of the conch almost straight, tip broadly rounded off, outer margin straight; antitragus scarcely distinguishable from the outer margin, a small almost imperceptible shallow notch indicating its commencement; tragus triangular, rounded off above. Muzzle flat, obtuse; the upper lip with shallow vertical wrinkles ; nostrils opening sublaterally. Gular sac small, aperture circular, directed downwards; quite rudimentary in female. Wings from the ankles ; the outer and inner toes equally enlarged. Fur reddish brown above, paler beneath; base of the hairs much lighter. Above, a broad band of very short fur covers the wings behind the proximal four fifths of the forearm, but does not extend to the carpus. Upper incisors long, widely separated at their bases, converging |