1852.] ihe 159 
Ascomys eanadensis Lichtenstein, Abhandl. Berl. Akad. 1822, p. 20, tab.; 
Brantz, Muiz. 24; Wagner, Schreb. Satigeth. Suppl. 3, 383; Schinz, Syn. Mam. 
Salons 
P seudostoma bursarius Say, Long’s Exped. 1, 406, Godman, Nat. Hist. 2, 
90, fiz. 2; Harlan, Fauna, 153; Audubon and Bachman, Quadrupeds of America, 
1, 332, pl. 44. 
? Mus saccatus Mitchell, Med. Repos. 1821: 5, 89. 
Saccophorus bursarius Kuhl, Beitrage, 66; Fischer, Syn. Mam. 304 ; Eydoux, 
Voy. Favorite, 1, 23. 
One small specimen from the Bonaparte collection, locality not stated. Ac- 
cording to Lichtenstein and Bachman, it is found in Canada and in the upper and 
middle portion of the valley of the Mississippi. 
The fur is fine and dense, not very lustrous; it is deep plumbeous for two- 
thirds of its length; above it is tipped with rufous, beneath with ochreous yellow; 
the margin of the cheek pouches, the feet, and the posterior part of the fore legs 
are covered with whitish hair. The margin of the ears is short but very distinct; 
the tail is almost entirely naked. The superior incisors have two grooves, the 
outer one broad and deep, nearer the external than the internal margin ; the inner 
one fine and deep, contiguous to the margin. The anterior claws are compara- 
tively larger than in G. hispidus. 
This species agrees accurately with the description and figure of Lichtenstein. 
Mus bursarius (Shaw,) which is referred to this species, is altogether doubtful, 
and ought to be omitted; his description reads ** cauda subnuda,”’ while the figure 
represents it as decidedly hairy for its whole length; the references to it as well 
as to other notices too imperfect for determination will be found at the end of 
this essay. Godman’s figure is worthless, and both his account and Harlan’s are 
copied from Say. Mitchell’s account is extremely imperfect, and nothing but 
the locality (Lake Superior) induces me to refer it to this species. Wagner has 
misquoted Lichtenstein; the citations from Brantz and Kuhl I have copied, as I 
have not had access to their original memoirs. Eydoux? remarks relate only to 
the teeth, and are applicable to other species. 
3. G. pineti, mollipilosus, plumbeus, pilis inferioribus apice albidis, mento 
pedibusque albopilosis, cauda brevi nuda, auribus obsoletis, primoribus superiori- 
bus extra medium sulcatis. 
Length from nose to root of tail, . : 6 . Wik 
OG Tail, . : : A 5 : 2°5 
Anterior foot to end of third claw, : : 3 1:4 
Posterior foot to end of third claw, : 3 : 1°5 
Rafinesque, Am. Monthly Magazine, 1817, 2, 45. 
Saccophorus? pinett Fischer, Syn. Mam. 305. 
Pseudostoma floridana Aud. and Bachm. Quadrup. Am. 3, pl. 150, fig. 1. 
One specimen from Florida in the Academy, and two from Alabama, from V. 
G. Audubon, Esq.; also inhabits the Jower part of Georgia, but suddenly dis- 
appears at the Savannah river, not extending into South Carolina. The fur is 
fine, dense and shining, dark plumbeous, on the back tipped with blackish brown, 
fading gradually on the sides into brown, and on the belly into whitish gray ; 
the upper lip is white; the ears are scarcely perceptibly elevated; the tail is 
naked, with only a few distant, short, grayish hairs. ‘The upper incisors are 
deeply grooved just outside of the middle of the anterior face: the inner margin 
is not grooved. The smaller of the specimens sent me by the kindness of Mr. 
Audubon is more decidedly brown, so that the dark color is assumed only by 
the adult animal, or is dependent on season. 
Rafinesque’s description “ murine color, tail entirely naked, shorter than the 
body,” although short, is characteristic, and coupled with the locality, leaves no 
doubt whatever of the identity of the present species. There is a notice in 
Bewick’s History of Quadrupeds, (New York ed., 1804, p. 525,) of a species from 
Georgia, by Dr. S. L. Mitchill, which from the locality may be identical with 
the one here described, but the description is worthless, and is moreover unac- 
companied by any systematic name. 
