3S2 Mr. 0. Thomas on 



It is of much interest to find tliis representative of the 

 more northern C. mexicanus group existing side by side with 

 the southern type to which C. Rothschihli belongs. 



As a species C. henatus is readily recognizable by the 

 peculiar characters of its skull, and especially of its nasal 

 rciiion. 



LIT. — Two South- Amer/' can Forms lo/ Rhogeessa. 

 By Oldfield Thomas. 



In his monograph of North-American Vespertilionidee* 

 Mr. Gerrit S. Miller has given an account of the species of 

 Bhogeessa occurring in North and Central America and in 

 Margarita Island, but he had not seen any from the mainland 

 of South America. 



In the British Museum there are examples of two forms 

 from the latter continent closely allied to each other and to 

 the Central- American R. tumida, but sufficiently distinct to 

 require names. 



The first may be called 



Rhogeessa io, sp. n. 



Size rather less than in R. tumida and skull more delicately 

 built. General colour rather more yellowish than in R. tu- 

 mida, the optical mixture across the shoulders of the usual 

 light basest and dark tips of the hairs resulting in a hue 

 approaching Ridgvvay's " raw umber," while in R. tumida it 

 is deader and nearer " broccoli-brown.^' The dark brown 

 ends to the hairs are the same in both. Under surface again 

 slightly more yellowish and less brown than in R. tumida. 

 These comparisons are made on specimens which have never 

 been in spirit, and are therefore trustworthy for the purpose. 

 Ears rather smaller, and narrower in proportion than in 

 R. tumida, the length from the inner basal lobe to the tip 

 10 millim. as against 11 millim. in the allied form. Wing- 

 membranes uniformly brown, without posterior white edging. 



Skull markedly smaller and more delicate throughout, 



* N. Am. Faun. no. 13, p. 122 (1897). 



t A topotype of R. parvula, 11. All., from the Tres Marias Islands, has 

 tlie bases of the hairs light as usual, although Mr. Miller speaks of the 

 species as being distinguished by the hairs being "darker at base." 

 But Dr. Harrison Allen's words do not necessarily bear the interpretation 

 Mr. INliller has put upon them, as he speaks of the colour as a '" Uylit 

 greyish brown at basal third." 



