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SYNOPTICAL LIST OF THE EXTINCT RODENTIA OF NORTH 
AMERICA. 
By J. A. ALLEN. 
The following list is intended to include all of the extinet Rodentia of North 
America described prior to 1877. The Sciuromorphs, Hystricomorphs, and Leporid, 
having been nearly all noticed at some length in the preceding pages of the present 
series of monographs, it is deemed sufficient in the present connection to cite the 
earlier pages of the present work, wherein they are more fully noticed. In respect 
to the others, references are here given to the papers and works wherein they were 
originally described or subsequently noticed, together with short notices of their lead- 
ing characteristics so far as they are at present known. With our present imperfect 
knowledge of the extinct forms here enumerated, it is impracticable to attempt any- 
thing more than a compilation of the species as described by authers. 
GLIRES SIMPLICIDENTATI. 
SCIUROMORPHA. 
SCIURID/. 
SCIURUS CALYCINUS Cope. See anted, p. 931. 
SCIURUS PANOLIUS Cope. See anted, p. 982. 
SCIURUS RELICTUS Cope. See anted, p. 932. 
TAMIAS LAVIDENS Cope. See anted, p. 932. 
ARCTOMYS VETUS Marsh. See anted, p. 933. 
PARAMYS ROBUSTUS Marsh. See anted, p. 934. 
PARAMYS LEPTODUS Cope. See anted, p. 934. 
PARAMYS DELICATUS Leidy. See anted, p. 934. 
PARAMYS DELICATIOR Leidy. See anted, p. 934. 
PARAMYS DELICATISSIMUS Leidy. See anted, p. 935. we 
