Eodentia. MAMMALIA. Eodentia. 
Ixxxvii 
of same. It is intenneciiate in size between S. vari- 
abilis and S. rufoniger ; its lengtli is )iine and a half 
inches ; of tail to end of hairs ten inches. It is from 
Panama and Central America generally. 
PERUVIAN SQUIRREL (S. variaiilis, Geoffrey ). — 
Gray described this as Macroxus fnmigatns, Ann. 
and Mag. Nat. Hist., 1867 ; 'I’schudi as S. tricolor, 
in Fauna Feruana. Other synonyms are recorded. 
It is a larger form ; body eleven inches long; tail to 
end of liairs thirteen and a quarter inches in length. 
The pelage is short, harsh, and sparse. The ears are 
long and narrow, the tail very full and bushy. 
Above, the color is black, varied with fulvous, or 
red ; beneath, it is abruptly paler, of a yellowish- 
white. Occasionally the whole animal is black. 
This species is distinguished by its large size and 
long narrow ears. 
Doubtful Species. 
Under the above head Mr. Allen considers some 
forms that have been named by foreign authors, and 
have not yet been clearly recognized. Sciurus 
nehouxi, Is. Geoff., was obtained in Peru by Dr. 
Neboux, for whom it is named. Geoffrey gives a 
colored figure of it in the Voyage of the Venus. It 
measured inches. Although this species 
seems quite different from any other described, Mr. 
Allen says, “ It may, however, be merely a gray 
phase of some other well-known species, possibly of 
S. hypopyrrlius.” 
Sciurus dimidiatm, Waterhouse, named by Gray, 
Macroxus, was described by Waterhouse as a South 
American species. Some doubt is expressed about 
its American origin. 
Semrus hottm. Lesson. — This is said to have come 
from California. 
Sciurus clarhei. Ham. Smith, called Spermophiliis 
clarkei by some authors. This was figured by Ham- 
ilton Smith from a specimen in Peale’s Old Museum, 
Philadelphia, which was said to have been brought 
home from the West by Lewis and Clark, the Mis- 
souri explorers. It does not agree with any known 
American Sciurus. Authors consider it a doubtful 
American form. 
Sciurus socialis,Wagner,\s & described by 
Wagner, in 1837, from two specimens brought from 
Mexico. They were at first named S. albipes, after- 
wards S. varius, then they were called by the present 
name. 
Tamias. — Illiger. 
'J'he characters of this genus are seen in the nar- 
rowed skull anteriorly, the long post-orbital pro- 
cesses, which are slender and directed downward and 
backward. 'I’he malar bone has a more oblique 
plane, and the zygomatic process of the maxillary is 
more expanded and depressed than in Sciurus, but 
rather less so than in Spermophilus. The anti- 
orbital foramen is oval, and situated in the base of 
the zygomatic process of the maxillary. 'I'he upper 
premolars are two or one ; when two are present the 
first is generally minute. Ears of medium size or 
small, well clothed, but never tufted. 'J’he cheek 
pouches are large. 'I'he pollex has a well-developed 
nail. 'I'he tail is shorter than the body, flattened 
and rather broad, shorter and much narrower than in 
Sciurus. 'I’he pelage is full generally, and soft, 'i’he 
dorsal surface has two and sometimes four longi- 
tudinal stripes bordered on each side. 'I’amias re- 
sembles strongly Spermophilus, the move noticeable 
differences being : In 'I’amias there is occasionally 
only a single upper premolar, and when two are 
present the first is generally minute, but little larger 
than those of S. hudsonius. In Spermophilus two 
are always present, and the first is functionally de- 
veloped, being from one fourth to one half the size 
of the second. In 'I’amias the whole dentition is 
weaker, and the teeth relatively smaller. 'I’he 
anti-orbital foramen is sometimes quite narrow, 
and the outer and lower border is not generally 
developed into a projecting bony rim, culminat- 
ing in a tubercle, as in Spermophilus. The tail is 
usually more flattened, and the general form is more 
Sciurine. 'I’he skull is more delicate, also. 
As above defined, according to Mr. Allen’s sy- 
nopsis, 'I’amias has four species. All are represented 
in North America; three of them are not found else- 
where ; the fourth, 'I. asiaticus, ranges over the 
western portion of North America and a large por- 
tion of Northern Europe and Asia. 
THE STRIPED SQUIRREL {Tamias striatus, Linn., 
Baird) is the Sciurus striatus of Linmeus. No other 
animat is more familiar to the country-side than this 
cheery little Chipmuck, Chipping, or Ground Squirrel, 
as it is variously termed. Hackey is another name, 
known more in the Middle States. Old stone walls 
seem to be the favorite resort of this little ci’eature, 
and every country boy finds such localities most cer- 
tain to yield ready game to his box-trap. 'I’he length 
of this species is five and three-quarter inches ; the 
tail to end of the hairs four and a quarter inches. 
'I’his creature is too well known for us to add more 
descriptive matter. Its coloration is very constant. 
Mr. Allen says: “ 'I’he variation in about a hundred 
skins of New England specimens consists merely in 
a more or less grayer cast of the upper surface in 
some than in others, in the sides being more strongly 
yellowish, and the rump of a darker or lighter shade 
of chestnut. 'J’he stripes vary somewhat in width 
and purity of color.” 'I’he Striped Squirrel inhabits 
from Minnesota to the Atlantic, and from Canada to 
Georgia. It is not found in the “alluvial districts of 
Carolina,” nor in Florida. 
NORTHERN CHIPMUCK ( T. lorealis, Gmelin, Allen) . 
— 'I’his is '1'. quadrivittatus of Aud. and Bach., and 
' 1 '. pallasi, Baird. 'I’he variety borealis has a length 
of five and a half inches; the tail to end of hairs is 
five inches. 'I’he color above is a pale yellowish- 
gray, with a faint wash of brownish fulvous on the 
sides ; the back has five black lines, which alternate 
with four lines of yellowish-gray, all being nearly 
equal in breadth, and somewhat sharply defined. It 
is grayish-white beneath. 'I’he sides of the head 
have two narrow lines of grayish-white, extending 
from the nose to the ear, a brownish-black stripe in- 
tervening ; a narrow blackish-brown stripe is above 
