Vol. XXIV, pp. 237-240 November 28, 1911 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



THREE NEW MAMMALS FROM CENTRAL AND SOUTH 



AMERICA. 



BY E. A. GOLDMAN. 



While engaged in the identification of a collection of mam- 

 mals for the Biological Survey the following unnamed species 

 have been detected among the undetermined material in the 

 l". S. National Museum. For the privilege of describing them, 

 and for other courtesies, I am indebted to Mr. Gerrit S. Miller, 

 Jr., Curator, and Mr. N. Hollister, Assistant Curator of the 

 Division of Mammals. 



Marmosa ruatanica sp. nov. 



Type from Ruatan Island, off the north coast of Honduras. No. 7785, 

 adult, I'. S. National Museum, collected by J. Akhurst. 



General characters. — Size large — about as in chapmani, of Trinidad; 

 general color similar, but duller; black orbital markings extending for- 

 ward to nose; molariform teeth smaller. 



Color. — Type (in worn pelage): General color above between cinnamon 

 and isabella color, becoming smoky-brown on top of head, and lighter 

 again on broad line down middle of face; blackish orbital markings 

 extending to nose; under parts cream color, tinged with pale yellow; 

 ears dark brownish ; feet soiled white; tail dusky on basal half, becoming 

 somewhat lighter terminally. 



Skull. — Similar in general to that of chapmani, the rostrum rather 

 broad ami heavy as in that species; supraorbital ridges less developed; 

 nasals similar in shape, but less prolonged posteriorly; molariform teeth 

 smaller. 



Measun merits. — Dry skin : Total length, 338; tail, 188; hind foot, 24.5. 

 Skull: Occipito-nasal length, 40.5; zygomatic breadth, 22.7; nasals, 

 17.7 x 4.9; interorbital breadth, 5.8; palatal length, 21; three anterior 

 molariform teeth, 6. 



Remarks. — In general characters this insular species agrees more closely 

 with chapmani of Trinidad, than with any mainland form available for 



46— Proc. Biol. Soc. Wash., Vol. XXIV, 1911. (237) 



