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Show 1880.] MR. W. A. FORBES ON LEPTOSOMA DISCOLOR. 465 inches. Length, forearm 1-6 „ thumb 0*35 „ third finger, metacarp 1*5 )5 55 j, 1st ph 0*5 5, 55 55 2nd ph 08 55 ^ 55 5, 3rd ph 0*5 „ fourth finger, metacarp T45 5, 55 5, 1st ph 0*4 „ „ „ 2nd ph 0*55 „ fifth finger, metacarp 1*25 „ 55 5> 1st ph 0*35 „ „ „ 2nd ph 0*5 ,, tibia 0*55 foot 0*38 ARTIBEUS QUADRIVITTATUS, Ptrs. Popayan. CHIRODERMA SALVINI, Dobson. Popayan. An adult male specimen of this species, with faintly marked facial streaks, and a very narrow white line in the fur along the lower half of the spine. This shows that the white streaks are as variable in this species as I have already noticed in the case of Artibeus plani-rostris (Catal. Chirop. Br. Mus. p. 516). The important structural characters on which the species depends are, however, as well marked in the only specimen hitherto known (the type, in the collection of the British Museum), which was collected by Mr. Salvin in Costa Rica, and named by m e after the discoverer. " EXPLANATION OF PLATE XLVI. Fig. a. Megaderma gigas, natural size. b. Skull of Megaderma gigas. 3. On the Anatomy oi Leptosoma discolor. B y W . A. F O R B E S , B.A., F.L.S., Prosector to the Society. [Eeceived May 28, 1880.] It is to the liberality of my friend Prof. A. Newton that I am indebted for the opportunity of dissecting a female example of this bird, the most peculiar, perhaps, with the exception of Mesites, of all the anomalous forms that Madagascar produces. Till the past year or two our knowledge of the structure of Leptosoma was almost confined to its skin and certain parts of its skeleton. Mr. Sclater, in this Society's 'Proceedings' (1865, pp. 682-689; also in Nitzsch's 'Pterylography,' Ray Soc. ed. App. ii. p. 158) has already given us an account of the different views that have at various times been held by ornithologists as to the position of this |