MAMMALIA — RODENTIA. 
45 
brown above, yellowish-white beneath ; has longer and narrower ears 
than the latter ; spur at the root of the hand much longer (11^ lines, in 
sabrinus only 9), and therefore the wings also are much broader ; on 
belly an ochre-coloured tinge, which is wanting in the Pt. sahrinus; 
body 6" 8'" ; tail 6" ; ear 7'" ; breadth between external margins of 
wings 8". 
The Pouched Squirrels have been enriched with three North American 
species, collected from the coasts of the Pacific. Two of these, collected 
by Townsend, are described by Bachmann (Phil, Joum. viii. 1, p, 68) : — 
1. Tamias Townsendii ; like the T. Lysteri, but larger; tail much 
longer ; no white stripes on the sides, but a red colour on the haunches ; 
head and back yellowish-brown, with five black stripes lengthways ; 
body 6" 9 "' ; tail, without hair, 4", with hair, 5" ; Common in the woods 
on the west coasts, where it lives in holes under the earth. 2. T. mini- 
mus ; a black stripe runs along the spine from the forehead to the tail ; 
on each side a whitish ash-coloured one, then a brown, next a pure white, 
and at last again a brown stripe accompanies it; under side white; from 
the nasal fossae, over the eye, is a white stripe, bordered superiorly with 
brown ; through the eye to the ear runs a red line, under it another ; 
tail slender, superiorly brown, bordered with bright red ; body 3" 9'" ; 
tail, without hair, 3" 2'", with hair, 4" : Very plentiful along the banks 
of the Rio Colorado. The third species, T. Hindei, has been described 
by Gray (Ann. x. p. 264) ; rufous brown, with three rather close black 
streaks on the middle of the back, the outer ones edged with a white 
streak, having an indistinct black edge to it on its outer side ; belly 
white; feet rusty brown ; hair of tail red at the base, with a broad black 
subterminal band and a whitish tip ; body 5^" ; tail 4^" : California. 
Blasius remarks, in the Verb, der deutsch. Naturf. zu Braunschw, 
p. 87, that Tamias striatus is found westward from the Ural, almost to 
the Dwina; and in the woods on the Witschegada and Sissola it abounds. 
On the other hand, Pteromys volans is rarely seen in all the North. 
To the American Marmots some additions have been made to their 
species by Bachmann, in the Journal of Philadelph. viii. 1, p. 6, and ii. 
p. 319. 1. Spermophilus Tovmsendii, allied to the Sp. Richardsonii 
and guttatus, Rich. ; above brownish-grey (hair black at the root, then 
silver-grey, then dark brown, with yellowish-white tip) ; hair of the under 
side black, tipped with grey ; tail above the same colour as the back, be- 
neath slightly tinged with brown ; body 3f" ; tail, without hair, V\ with 
hair, \y ; inhabits the prairies on the W alla-walla ; becomes very fat ; 
disappears in August, and appears again early in spring in a very lean 
condition. 2. Hp. annulatus ; superiorly reddish-brown, spotted with 
black ; beneath white ; tail with 17-20 black rings ; body 8" 2'" ; tail 
without hair 8", with hair 9" 4'" : Inhabits the western prairies, without 
exact limit. 
89 
