RODE NT IA—GEOJYIYINAE GEOMYS JVIEXIC ANUS. 
387 
Measurements . 
Inches. 
Lines. 
Nose to root of tail (very uncertain)_ 
10 
6 
Tail from root to end of vertebrae____ 
3 
Arm, forefoot to end of claws...___ 
1 
3 
longest claw, (3d)_ 
8* 
5* 
* 
6 
its digits_...._I.._ 
Hand, without claw_ . 
1 
Second claw_ _ 
its finger above.__ ... 
3 
GEOMYS MEXICANUS. 
Tucan. 
Ascomys mexicanus, (Lichtt.) Brants, Muizen, 1827, 27. 
Licht. Abh. K. Akad% Wiss. 1827, 113. 
Wagner, Suppl. Schreb. Ill, 1843, 384.—Is. in Schreber IY; pi. ccvi, A (interpolated). 
Charles worth, Pr. Zool. Soc. Lond. IX, 1841, 60. 
Sacccphot'us mexicanus, Fischer, Syn. 1829, 305. 
Eydoux and Gervais, Guerin Mag. de Zool. VI, 1836, 23 ; pi. xxi, f. 5, 6. 
Eydoux and Gervais, Voyage de la Favorite, V, 1839, 23 ; pi. viii, f. 5, 6. (Skull.) 
Geomys mexicanus, Leconte, Pr. A. N. Sc. Ph. VI, Sept., 1852, 160. 
Pseudostoma ( Geomys) mexicanus, Aud. and Bach. N. Am. Quad. Ill, 1854, 309. 
Tucan, Hernandez. 
Sp. Ch.—‘ ‘ Fur very fine, shining, very dark cinereous, above tipped with black, beneath entirely cinereous ; nose and 
whiskers brownish ; breast and fore legs slightly tinted with brown. Ears short. Upper incisors with a very deep groove 
on the middle of the anterior surface. Feet thinly clothed with brownish hair. Tail covered with hair, which is very dense 
and long at the base, gradually becoming shorter and more scanty, leaving the tip almost naked.” 
The preceding diagnosis is by Dr. Leconte, from a specimen in the collection of the Philadel¬ 
phia Academy. 1 The length is given at 11 inches ; tail 5 ; fore foot to end of middle claw 1.7 
inch ; hind foot to end of middle claw 1.7 inch. 
This completes the record of American animals of the genus Geomys , with the exception, per¬ 
haps of the SaccopJiorus quachil, of J. E. Gray, Pr. Zool. Soc. XI, 1841, 79, from Coban, 
Central America. As no description accompanies the name, we can only learn that the genus 
extends this far to the south. 
1 As this article is passing through the press, I find (too late for use) a specimen of this species in the collection of the 
National Institute, brought from Mexico by Baron Gerolt. It is much larger than any skin of the genus I have ever seen. 
