6 



ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 



lono- 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. 



Length of the head and body 



the tail 

 Expanse of the wings . 

 Length of the ear 



In. Lines. 

 1 8 



1 



81 



8 3 



Length of the tragus 



the antibrachium 







Kl 



the thumb (claw included) 

 the tibia 



In. 



Lines. 







*h 



1 



H 







H 







ef 



Habitat, Chiloe. (January.) 



" 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 appear a congenial 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^. 



Dysopes nasutus. 



Molossus nasutus Spix, Simiarum et Vespertilionum. Braziliensium species novse. Nyctinomus Brazi- 

 liensis. — Geoffroy^ Annales des Sciences Naturelles, torn. i. p. 337. pi. 22. 



Of this species I find three specimens in Mr. Darwin's collection — " It is re- 

 markable," says Mr. Darwin, " for its wide geographical range. I obtained 

 specimens at Maldonado, on the northern bank of the Plata, where it was ex- 

 ceedingly 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 (naranjado) colour." 



Upon comparing the dimensions of several specimens of this species with 

 those given by Temminck in his " Monographic sur le Genre Molosse," I find 

 that they vary very considerably ; I shall therefore be adding some little to the 

 history 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 



