RODENT! A GEOMYINAE GEOMYS MEXICANUS. 



387 



Measurements. 



GEOMYS MEXICANUS. 



Tucan. 



Ascomys mexicanus, (LiCH-rr.) BRANTS, Muizen, 1827, 27. 



LIGHT. Abh. K. Akad. Wiss. 1827, 113. 



WAGNER; Suppl. Schreb. Ill, 1843, 384. IB. in Schreber IV; pi. ccvi, A (interpolated). 



CHARLESWORTH, Pr. Zool. Soc. Lond. IX, 1841, 60. 

 Saccophorus rneximnus, FISCHER, Syn. 1829, 305. 



ETDOUX 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, (5. (Skull.) 

 G&mys 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 Saccophorus quacliil, 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. 



