464 U. Ss. P. R. R. EXP. AND SURVEYS—ZOOLOGY,“ GENERAL REPORT. 
HESPEROMYS TEXANUS, Woodhouse. 
Hesperomys tecana, Woopuovse, Pr. A. N. Sc. Phila. VI, Feb. 1853, 242.—Is. Sitgreaves’ Rep. Exp. Zuiii, &c. 
1853, 48; pl. ii. Mammals. 
Arvicola (Hesperomys) tecana, Aup. & Bacu. N. Am. Quad. III, 1854, 319. 
Sp. Cu.—Size and proportitns about as in H. leucopus. Ears small; tail rather shorter than head and body. Color above, 
reddish brown; brighter than in H. leucopus, and more like H. awreolus, but darker. No conspicuous wash of dusky on the 
back. Feet, belly, and under surface of tail pure white. Outside of fore leg like the back? 
I find it very difficult.to characterize this species as distinct from H. leucopus, although it is 
very probable that the two are different. The proportions of the limbs are quite similar, 
although the posterior tubercle of the sole appears smaller and further back. The sole is 
densely hairy from the heel to this tubercle. The tail is rather shorter than the head and 
body. ‘The ears are rather smaller than usual. The general color above and on the sides is a 
reddish brown, brighter than in H. leucopus, or more like H. awreolus. The tint is quite 
uniform throughout, there being no indication of darker on the back, as in the other. The 
under parts and feet are pure snowy white, the tail decidedly bicolor. The young are of much 
the same general plumbeous above as in H. leucopus. 
From the list of references it will be seen that the species at present is only recorded as found 
in the lower parts of Texas and along the Rio Grande to El Paso. 
List of specimens. 
T 
a Measurements. 
= 
ae Jelslel¢| 
2|% : | el2/2leioi. 
E S é Locality. When col- | Whence and how| 2 | Naturcof| . | — he q l= 's|2| B/S | Collected by— 
Fl] pw | & lected. obtained. 3 |specimen.| 2/3 |S) S}si/s/e\= a |% 
B| = |= 3 S/S) F/e sleds ls)s ls 
s| 2/5 £ sjelelelelelslalale 
5/6 (3 So 2 (24/4 (4/5 fF lajai Ale 
2559} .ceescleses| Western Texas. cccss-|socsees +... Capt. L. Sitgreaves)..../Skin in al.| .50 Bal 1: .35) .78 -| Dr. Woodhouse. 
2654) ...008 «+++| Fort Bliss, N. Mexico.|....++ eeeees Dr. 8. W. Crawford vooelIn alcohol.| .50 -38) 82 
7145] 1127 |....] El Paso, Texas.....cslececcevevess \Col. J.D. Graham.|.... Skin ..... eee | 
1736}... O | Western Texas.....c.|ecceessecess(Capt. POpe s seeees eels wAO-stentel deee ctualeees [ce edl st 
1734}..600. © | Waco Tanks, N. Mex.| Oct. 3, 1855 |....d0.ssseeeeeee.| 143.0. s005 soul oo] vous eneees oe 
44>) 1582 fol Pecos to Rio Grande..|....1853....|Cpt. A. W.Whipple!....|..d0...... ive ..| Dr. Kennerly... 
1037) 2217 |....| Turkey Creek, Texas.| Nov., 1854 Major Emory..... wtve(Motinted .|cccc faces | eal owee|aeue|secelecice| seek LO) cOutes pain GOs. cacese 
1038} ..cccsleces|ove esAOscvcvcccieeeess weet Oueistece seeeOOtsupatevedee se. Inalcohol.| .43] . avec Ges ieeeen 
579) 1702 |....| Chaco Escondido, Mex| Mar., 1853 |Lt. D. N. Couch...|.... Skin...... sees os Secces 
1802 |....| Brownsville, Texas...|....+.++++..|Capt. Van Vliet.../.... Skull..... word / Usesee tecee 
os Ree wk Ae eh hs i te 
HESPEROMYS GAMBELI, Baird. 
Se. Cu.—Very similar to H. leucopus in size and proportions. Feet perhaps shorter. Ears larger. Tail generally less than 
head and body, sometimes a very little longer. Above, yellowish brown, much mixed with dusky, but without a distinct broad 
wash of darker on the back. The entire outside of the fore leg below the shoulder, white? , 
Body stout, with long fur. ars very large, thinly coated with short hairs; the antitragus 
distinct. Fore feet rather large, hind feet small. Tail shorter than the body, scarcely reaching 
beyond the ears when bent over; the hairs only slightly elongated at the tip. One specimen 
(369) with 24 caudal vertebree. 
