COUES ON GEOMYS AND THOMOMYS G. H1SPIDUS. 239 
GEOMYS HISPIDUS, Lee. 
Saccophorus quachil, GRAY, P. Z. S. xi, 1843, 79, ex Coban, VeraPaz, descr. nulla! GERE., Cat. Bones Br. 
Mus. 1862, 223. 
Geomys hispidus, LEC., Proc. Acad. Nat. Sci. Phila, 1852, 158. BAIRD, M. N. A. 1857, 386, pi. 22, f. 4 a-d. 
Pseudostoma (Geomys) hispidum, AUD. & BACH., Q. N. A. iii, 1854, 306. 
DIAGNOSIS. Superior incisors with a single strong deep furrow, lying 
wholly in the inner half of the tooth. Tail and hind feet naked, or nearly so; 
fore feet sparsely hirsute. Fore feet, including claws, decidedly shorter than 
the hind feet. Pouches moderate, scarcely or not reaching beyond the head. 
Pelage stiff, hispid, and almost lusterless. Color uniform dull chocolate- 
brown, merely paler, grayer, or smoky brown below. Of large size ; upward 
of a foot long; tail short, about 3 inches; sole, 1, &c. 
HABITAT. Mexico and Central America. 
Description (from various dried specimens). The animal indicated in 
the foregoing paragraph, and about to be described in further detail, agrees 
perfectly with the accounts. given by LeConte and Baird from the same spec 
imen collected some years ago by Mr. Charles Pease, somewhere between 
Vera Cruz and Mexico City. The type remained unique until recently, when 
several well-prepared skins reached the Smithsonian. These are from Xalapa, 
Mexico (De Oca}, and Necostla, Mexico (Sumichrasf] ; Costa Rica (Zeledon 
and Canmof) ; and Guatemala City ( Van Patten). Most of these specimens 
are labeled "mexicanus," as might have been expected under the circum 
stances. They agree perfectly with each other, as well as with the above- 
quoted descriptions, and are unquestionably distinct from the true mexicanus. 
In the original notices, the character of the upper incisors was not fully 
indicated, owing to defect of the specimens. My specimens show that these 
teeth are unisulcate, as in mexicanus, but that the position of the groove is 
sufficiently different to constitute by itself a perfect specific character. In 
mexicanus, as has been already said, a single profound groove bisects the 
tooth; in hispidus, there is a similar single groove, but it lies on the inner half 
of the tooth. In some specimens, indeed, where the groove is widest, it may 
encroach slightly upon the median line; but it usually lies altogether to one 
side, the outer plane surface of the tooth being alone as wide as the groove 
plus the inner plane surface. This character is unique among the species 
