202 
PTEROMYS S A B R I N U S Pen n ant. 
Severn River Flying-Squirrel. 
PLATE C X L 1 1 1.— Fig. 1.— Natural Size. 
P. Magnitudine P. volucellum tertia parte excedens ; caudii corpore 
curtiore, patagio lumbari pone carpum in lobum rotundatum excurrente, 
colore flavescente-cano obscuriore inumbrato. 
CHARACTERS. 
One third larger than P. volucella : tail , shorter than the body ; flying 
membrane having a small rounded projection behind the wrist. Colour , dull 
yellow gray, irregularly marked with darker. 
SYNONYMES. 
Greater Flying-Squirrel. Forster, Philos. Trans., vol. lxii. p. 379. 
Severn River Flying-Squirrel. Pennant, Hist. Quad., vol. ii. p. 153. 
“ “ “ Arctic Zoology, vol. i. p. 122. 
Sciurus Hudsonics. Gmel., Syst., vol. i. p. 153. 
“ Sabrinus. Shaw, Zool., vol. ii., part 1, p. 157. 
Pteromys Sabrinus. Rich., Zool. Jour., No. 12, p. 519. 
“ “ “ F. B. A., p. 193. 
DESCRIPTION. 
Head, short and somewhat rounded ; nose, short and obtuse ; eyes, 
large ; flying membrane, extending from the wrist to the middle of the 
hind-leg, nearly straight, having only a slight rounded projection close to 
the wrist ; tail, depressed, slightly convex on its upper surface, but quite 
flat, or even somewhat concave, beneath ; it is broadest about an inch from 
the body, and then tapers gradually but very slightly towards the extre- 
mity, which is rounded ; the flattened form of the tail, and its distichous 
arrangement, is given to it in consequence of the fur on its sides being 
much longer than that on its upper surface ; the extremities are small ; the 
fore-legs connected with the flying membrane down to the wrist ; the feet 
are hairy both above and below. There are four short toes on the fore- 
feet, and the claws are small, compressed, curved, and sharp pointed ; 
