1852.] 159 



Ascomys canadensis Lichtenstein, Abhandl. Berl. Akad. 1822, p. 20, tab.; 

 Braatz, Muiz. 24 ; "Wagner, Schreb. Saiigeth. Suppl. 3, 383 ; Schinz, Syn. Mam. 

 2, 132. 



Pseudostoma bursarius Say, Long's Exped. 1, 406, Godman, Nat. Hist. 2, 

 90, fig. 2 ; Harlan, Fauna, 153 ; Audubon and Bachman, Quadrupeds of Ame- 

 rica, 1, 332, pi. 44. 



? Mas sacca^ws 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 yel- 

 low ; 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 mar- 

 gin ; the inner one fine and deep, contiguous to the margin. The anterior claws 

 are comparatively 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 ot 

 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 bur 

 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. p i n e t i , moUipilosus, plumbeus, pilis inferioribus apice albidis, mento 

 pedibusque albopilosis, cauda brevi nuda, auribus obseletis, primoribus, superi- 

 oribus extra medium sulcatis. 



Length from nose to root of tail, - - - - - 11' 



" Tail, - 2-5 



Anterior foot to end of third claw, _ _ - - 1.4 



Posterior foot to end of third claw, - - - - i-s 



Rafinesque, Am. Monthly Magazine, 1817, 2, 45. 

 Saccophorus? pineti Fischer, Syn. Mam. 305. 



Pseudostoma floridana Aud. and Bachm. Quadrup. Am. 3 pi. 150, fig. 1. 

 One specimen from Florida in the Academy, and two from Alabama, from V. 

 G. Audubon, Esq. ; also inhabits the lower part of Georgia, but suddenly dis- 

 appears at the Savannah river, not extending into South Carolina. The far 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 characteristicj and coupled with the locality, leaves no 

 doubt whatever of the identify of the present species. There is a notice m 

 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. 



