130 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
TABLE XXX V.—Measurements of eleven specimens of OCHETODON MEXICANUS, 
Nose to— 
5 = 3 3 
8 Locality. Collector. e s | 8s Remarks. 
8 eel ee St ee BE} Il 
3 ES S B) re} a 5 #| is! 
4 BR | °o a a & iss} R 
7748 | Grand Coteau, La ...,-....| Saint Charles College.| 0.35 | 0.68 | 0.89 | 2,40 | 3.20 | 0.32 | 0.77 | 0.50 | Alcoholic. 
0,42 | 0.78 | 0.96 | 2.75 | 3.75 | 0.38 | 0.82 | 0.45 |.__.do. 
0.45 | 0.80 | 1.00 | 3.00 | 3.75 | 0.35 | 0.80 | 0.50 | Dry. 
0.42 | 0.76 | 0.95 | 2.75 | 3.60 | 0.33 | 0.81 | 0.45 |....do. 
0. 43 | 0.80 | 0.95 | 2.75 | 3.10 | 0.30 | 0.72 | 0.47 |....do. 
0.42 | 0.65 | 0.95 | 2.60 | 3.60 | 0.32-) v.75 | 0.57 | Alcoholic. 
0.40 | 0.78 | 0.94 | 2.30 | 3.35 | 0.33 | 0.74 | 0.46 |....do. 
0. 42 | 0.76 | 0.90 | 2.30 | 3.25 | 0.32 | 0.77 | 0.47 |....do. 
0,40 | 0.73 | 0.98 | 2.75 | 3.60 | 0.33 | 0.78 | 0.50 |..-.do. 
0.44 | 0.80 | 1.00 | 2.50 | 3.40 | 0.33 | 0.77 | 0.52 |...-do. 
0.43 | 0.72 | 0.92 | 2.50 | 3.35 | 0.32 | 0.75 | 0.53 |..-.do. 
* No. 4862 is a perfect albino, pure white overywhere, and doubtless had pink eyes. 
?OCHETODON MONTANUS. (ap. proband.) 
Reithrodon montanus, BatRD, Proc. Acad. Nat. Sci. Phila. vii, 1855, 335; M. N. A. 1857, 449, pl. liv, fig. 
No. 1306 (teeth), (Rocky Mountains, latitude 39°). 
Cuars.—Very small: head, ¢ of an inch; head and body, 2%; tail, 2; 
hind foot, 4; ear, 4. ‘Above brown and pale yellowish gray, much lighter 
than mouse color. Outside of ears and flanks, pale yellowish brown, without 
any rufous. Beneath, dull whitish.”—(Baird, 7. c.) 
The type and only known specimen of this species (No. 70s, Mus. Smiths.), 
now before us, is one of the very smallest North American Rodents we ever 
saw, although, as Professor Baird says, it appears to be perfectly adult, from 
the worn teeth and other signs. It is somewhat less than ordinary adult 
humilis ; it has, however, the same relative proportions of parts as in that 
species. In color, it is noticeably different from any other Ochetodon, being 
of the very palest kind of mouse-color above, the sides and under parts yel- 
lowish-gray, with barely a trace of the fulvous always noticeable in the other 
species. This coloration is exactly what we should expect after immersion 
in alcohol for some time, which we suspect to be the case, though we have no 
authority for stating that the specimen has been skinned out of spirits. The 
single specimen is too imperfect to permit of final characterization, or to 
enable us to come to any positive conclusion; but if the size and coloration it 
presents are really permanent, we should judge it entitled to recognition as a 
valid species. At present, however, we regard it with suspicion, and are 
unwilling to indorse its validity. 
