if 



Oi:0MYUM':-(JI::()MY8 MEXICASUB 



(517 



bill ncitlicr in size luir color, it agrees witii U. nte.ricatiu.i; in both lliesn 

 Hpecics, the single groove is central, bisecting the snrfaci;. so that, viewed 

 from the front, tlierc appear to be four incisors. This separates it from G. 

 burxariu.i, with which it agrees in size, averaging about the same ns G. bur- 

 sarins, though no specimens before me arc ns large as the largest of the latter. 

 Length, full grown, about 8 inches, rather less than more. Tail, 2.J to 3 

 inches. A notable peculiarity of form, in comparison with G. bursarius, lies 

 in the relative ])roportions of the fore and hind feet, which are much as in 

 GG. mexicanus and hisp'idus ; the palm, claws included, being shorter, or no 

 longer, than the sole and cluws; (he latter measuring about IJ incites, the 

 former only about 1 \ inches. External ears obsolete. Hairiness of tail and 

 hind feet much as in average G. bursnrius or G. mexicanus — they are thiidy 

 clothed indeed, but more hairy than in G. luza or G. hispidus. » 



Coloration dull, pale chestnut, or almost fawn-color, shaded with the 

 plumbeous basal portions of the fur. This tawny or fulvous tone is highly 

 characteristic in comparifion with the deeper and warmer chocolate or mahog- 

 any or muddy-brown of G. bursarius and G. mexicanus. On the under parts, 

 though the plumbeous basal portion of the fur shows considerably, the general 

 tint is whitish — quite white in comparison with the muddy-gray of the same 

 parts of G. bursarius. Whiskers mostly colorless, or fine and numerous, the 

 longest about equaling the head. Claws pale horn-color; palms and soles 

 variously discolored. Incisors orange. 



Notwithstanding the difference in size and color, the affinities of this 

 si>ecie8 are decidedly with G. mexicanus rather than with G. bursarius. 



GEOMYS MEXICANUS, (Licht.) Rich. 

 The Tucan, or Uextcan Pocket Gopher. 



A»comyii mexicantu, LicnT., Ablioud. K. Acau. Wiaa. Borl. 1827, 113. — Bhants, Miiizen, 1S27, 27. — Waon., 



Siippl. Schrob. ill, 1S43, 3»1 ; W, pi. aOO A.— Chaklebw., P. Z. 8. ix, IS41, 60 (habits).— 



SCHINZ, Synop. ii, 1845, 13:1. 

 Saccophorus mrakoHiM, Fison., Synop. 1829, 305 Eyd. & Gkrv., " Gn(!rin'9 Mng. vi, ISHfi, 23, pi. 21, f. .I, 



0; Voy. Favorite, v, 1839, 23, pi. 8, f. 5, 6".— Ghay, List Mnuim. Br. Mue. 1843, 150.— Geuh. 



Cat. Bones Br. Mns. I8fia, 223. 

 Geamys mcxictinua, KiCH., Sixth Aun. Kcp. Brit. Assoc. Adv. Soi. for 1836, 1837, ICC— LkC, Proc. Acad, 



Nat. Spi. Phila. 1852, 160.— Baibd, M. N. A. 1857, 387.— CoUES, Proo. Phila. Acad. IWh, 133; 



Powell's Bop. Colorado B. 1H75, 2M (monograph). 

 Pseudoalmna {Geomyt) mexicatia, At:D. & Bach., Q. N. A. iii, 1854, 309. 

 (icomya (Saccophoriu)) mexicanua, Gieb., Sting. ISiV), 529. 

 Tucan of IIkrnandez. — Tufa or Tnjsa, Mexican.- Tiijaii opud GuRR., I e. 

 Mexlcatiwche Taichenmaus, German. 



Diagnosis. — Superior incisors bisected by a single median furrow (as in 





•m 



