Clirotoptcru3, Sciurus, Ncacomjs, t&c. 313 



Orinocan species P. Warreyn, tliough very closely allied, may 

 be distinguished by its shorter, imrimmed palatal foraruina 

 and broadly spatulate pterygoid processes. 



Marmosa cinerea mcaragucBj subsp. n. 



Similar to the Costa Eican M. c. Alsfoni, Allen *, in size 

 and general characters. Fur shorter and closer, hairs of back 

 about 8-9 mm. in length, instead of 11-14, and those of tail- 

 base only about 7 mm. in length as compared with 12-14. 

 General colour above greyish brown (nearest to sepia of 

 Ridgway). Under surface cream-buff, the hairs of the chest, 

 middle line of belly, and of inguinal region buffy to their 

 bases. Hands and feet pale greyish white. Tail very long, 

 decidedly longer than in Alstoni, dull blackish for about three 

 fifths of its length, then white, the junction of the two colours 

 gradual, without marbling ; in Ahtoni only about one third 

 of the tail is blackish. 



Skull as in the Costa Rica form. 

 Dimensions of the type (measured in the flesli) : — 

 Head and body 167 mm.; tail 281 ; hind foot, s. u. 28'5, 

 c. u. 30 ; ear 29. 



Skull : basal length 42*7 ; greatest breadth 25 ; combined 

 length of three anterior niolariform teeth 7*7. 

 Hah. Bluefields, Nicaragua : sea-level. 

 Type. Adult male. Original number 5. Collected 9th 

 January, 1905, by Mr. G. Palmer. 



Compared with half a dozen Costa Rican specimens — 

 practically topotypes — of Dr. Allen^s J/. Alston), tliis Marmosa 

 is readily distinguishable by its shorter fur, especially on the 

 furry tail-base, its longer tail, and the much greater extension 

 of the black down the latter organ. 



Marmosa cinerea Jemerarce^ subsp. n. 



Size a little smaller than in the other members of the 

 cinerea group. Fur of medium length ; hairs of back about 

 10 mm. long. General colour above as usual, near " broccoli- 

 brown.'^ Under surface broadly washed with " cream-buff,^' 

 not sharply defined laterally, the hairs ou the chin and down 

 the centre of the abdomen buffy to their bases. Dark orbital 

 rings narrow and ill-detined. Muzzle and cheeks pale buffy. 



* Caluromys Alstoni, Allen, Bull. Am. Mus. xiii. p. 189 (1900). Iain 

 still of the opinion that cinerea and its allies should be placed iu Marmosa 

 rather than iu Caluromys. For the time beiuj^- also I prefer to treat both 

 the Central American forms as subspecies of the Brazilian cinerea, 

 Ann. & Maj. X. Hist. Ser. 7. Vol.wi, 21 



