1880.] MR. W. A. FORBES ON LEPTOSOMA DISCOLOR. -465 



inches. 



Length, forearm I '6 



„ thumb 0"35 



„ third finger, metaearp 1'5 



„ „ » l&t ph 05 



„ 2nd ph 0-8 



„ „ „ 3rd ph 0-5 



„ fourth finger, metaearp r45 



,, „ „ 1st ph 0-4 



„ „ „ 2nd ph 0*55 



„ fifth finger, metaearp 1*25 



„ ,, „ 1st ph 0'35 



» „ „ 2ud ph 0-5 



,, tibia 0*55 



foot 0-38 



)> 



Artibeus QUADRiviTTATUS, Ptrs. Popayau. 



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 Artibeics jdani- 

 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 me after the discoverer. 



EXPLANATION OF PLATE XLVI. 



Fig. a. Megaderma gigas, natural size. 

 b. Skull of Megaderma gigas. 



3. On the Anatomy oi Lejitosoma discolor. 



By W. A. FoRBESj B.A., F.L.S., Prosector to the Society. 



[Received 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 ie7Jfo,soH2« was almost 

 confined to its skin and certain parts of its skeleton. 



Mr. Sclater, in this Society's ' Proceedings' (18G5, pp. 682-G89 ; 

 also in Nitzsch's ' Pterylography,' Kay Soc. ed. App. ii. p. 1 bb) 

 has already given us an account of the different views that liave at 

 various times been held by ornithologists as to the position of this 

 peculiar form ; and he was also the first to point out the existence 



