1873.] DR. A. GUNTHER ON NEW FLYING S0.UIRRELS. 413 



and kidney-shaped and very muscular ; both were empty, that of 

 the male containing only a rough calcareous pebble about half an 

 inch wide. The male's windpipe is shaped like that of F. marila, 

 figured in Tarrell, but is shorter, broader, and more roundish in 

 its outline. 



I have preserved the specimen for future comparison. 



The trachea of the female is much narrower than that of the male, 

 and has narrower rings ; the bronchi at the crutch separate, and meet 

 again to leave a hole between. 



4. Descriptions of three new" Species of Flying Squirrels in 

 the Collection of the British Museum. By Dr. A. 

 Gunther, F.R.S., F.Z.S. 



[Eeceived February 26, 1873.] 

 (Plates XXXVII., XXXVIII.) 

 Pteromys tephromelas. (Plate XXXVII.) 



All the upper parts and the tail black ; under-fur ash-coloured ; 

 on parts where the long black hairs have been rubbed off, as between 

 the shoulders, behind the ears, on the forehead, and sometimes on 

 the tail, the grey of the under-fur is more conspicuous. Lower 

 parts of the body and parachute very sparsely covered with greyish- 

 brown hair, except along the median line of the chest and abdomen. 



Cheeks without bristles ; ears of moderate size ; incisors of an 

 adult female white. Length of the body from the nose to the vent 

 10 inches ; of the tail 1 1 inches ; of the carpal spur 2 inches. 



An adult female, from Pinang, has been presented by his Grace 

 the Duke of Argyll to the British Museum. A second younger 

 female has been obtained in a collection from Malacca together with 

 the species of Sciuropterus described hereafter. 



Pteromys ph^eomelas. 



All the upper parts and the tail brownish black, on the neck and 

 middle of the back deep black ; under-fur dark chestnut-brown. 

 The longer hairs on the hinder half of the back and on the sides with 

 greyish -white tips. Lower parts of the body and parachute sparsely 

 covered with woolly chestnut- brown hair, more densely along the 

 middle of the chest and abdomen and on the outer half of the 

 parachute. 



Cheeks without bristles ; ears of moderate size ; incisors of an 

 adult female yellow. Length of the body from the nose to the 

 vent 13 inches ; of the tail 1 \\ inches ; of the carpal spur 3| inches. 



There is only one specimen, an adult female, from Borneo in the 

 British Museum. It is allied to the preceding species, but con- 

 spicuously larger, and distinguished by its brown under-fur. 



Sciuropterus pulverulentus. (Plate XXXVIII.) 



Upper parts of the body and parachute brownish black, powdered 



