74 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
tawniest specimen we have ever seen from Washington Territory, and in this 
respect exactly like some Massachusetts examples of leucopus. Color, then, 
affording ng data, and the matter of the cheek-pouches being already settled, 
we are driven back upon measurements alone to substantiate ‘‘boyli”; and 
we conclude our argument with the following table, comment upon which is 
unnecessary :— 
TaBLe XVI.—Measurements of five specimens of five “species” (so-called) of HESPEROMYS. 
Number. Supposed species. Trunk. | Tail. Sole. Ear. 
2778 || Dypicallof leucopus n= maeteme ma ale === loll melee mela 3.45 3.50 0.83 0. 61 
SOOM Uy DELO le D OV Utena mete aaiae ate erecta lente n= i 3.25*} 3.80 0. 85 0. 60 
13i3e| ey picaliohemy odes sase sesso ane eee ere eearre 3.50 3. 90 0. 85 0. 61 
1964) |e hy picalion “ anstenus tense ee = lee eee relent 3. 00 3.40 0. 82 0. 64 
10292 sl eaivipelonesonn cli size aaa eee eta tee mere emai ?t| 3.60 (U5ISY/ || SaneS5ac 
il 
* Printed in M. N. A. “5.25” by typographical error.—A second specimen of “ boylii” (No. 578) shows 
longer tail, feet, and ears:—trunk, 3.08 ; tail, 4.08; sole, 0.95; ear, 0.75; while a third (No. 810) has the 
tail considerably shorter than the trunk (trunk, 4.00; tail, 3.65). Professor Baird remarks of this No. 
810, that possibly it is “gambeli”, and prints it also under “gambeli”, with the remark, “possibly H. 
boylii”. It is, in fact, just as much like one as like the other. 
+ Probably about 3.50, but impossible to determine now, owing to the stretched and rat-eaten state 
of the specimen. 
A series of alcoholic specimens from Cape Saint Lucas, the first exam- 
ined, we believe, from this locality, offers some interesting features. Although 
it is not easy to judge of color in their present condition, they appear 
to be light-colored, with the dorsal stripe of the tail very narrow, and 
in this and other respects most of the series are undoubtedly referable to 
‘“oambeli”. A part of the series, however, shows an extraordinary length of 
the tail—in-this respect surpassing the most marked examples of ‘boyli” or 
“myoides”. In one specimen, the tail is nearly an inch and a half longer 
than the head, and in this one, as well as the rest of those with the tail 
decidedly longer than the body, this member is almost as naked as in a Jus, 
and unicolor, of a dull-grayish hue. In all these, the dark color of the leg 
extends on the base of the metatarsus—a feature shown distinctly even in a 
suckling specimen. Although in their present state these specimens do not 
show any appreciable difference in the body-colors from the “gambeli” com- 
posing most of the series, we have little hesitation in referring them to the 
Hi. aztecus. The length of tail of this species, it will be seen beyond, has 
not been known; for all three of De Saussure’s types had lost the tip of the 
tail. Our type of aztecus, received from De Saussure, agrees precisely with 
