306 U. Ss. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT 
2. Similar to the preceding. The interval between the hoary patches dark 
brown; nearly black. ......:..2.d2s,cocve dace osmaneaie duheh she ai ppleas seagate voaeeduenst 
3. Above, finely-grizzled gray and black. Anterior half of the body of a 
pure hoary gray cast ; posterior half with a strong wash of yellowish, in 
mar Kedi com trants-a-echie sects te oes eeeacsn deiguee tesaaemanchteh aos Aealas ieee kans ociecieo vacate 
A. (Color ‘entitely blacks<-.. 7. -0scssevss0. cvecccepunn debetas nate eRe axetieic te dvlearadyooccnace 
2d. Tail about half the length of the body. 
5. On each side of the back two black lines, separated by a white one of about 
equal diameter. Middle of back finely grizzled, without any line......... 
B.—Cotopotts, Brandt. 
Ears apparently wanting, or with the auricle very slightly developed. Tail 
either very short or half as long as the body, or a little longer ; narrow and 
slender. Soles usually more or less pilose throughout the year. Thumb 
armed with a distinct sharp claw, (not a nail,) though sometimes quite small. 
Ist. Ears rather short, but with a small, pointed, and perfectly distinct 
auricle. Tail half as long as the body. Soles pilose in summer. 
6. A distinct white stripe on each side, without any margin of black........... 
7. Mottled yellowish gray and brown. Head pure gray, without any tinge 
Ofi vel lowmiab ial save haddcadg=dnveictn ses snamnaaneveseas a> Seabaisnlveie asedawwetar ues semaaeees 
2d. Ears very short, apparently wanting, in the dried skin. Tail variable 
in size and length of hair. 
8. Tail very long, nearly equal to the body, exclusive of the head ; cylindrical. 
Color yellowish brown, finely pointed with black. No blotches or spots... 
9. Tail about two-thirds the length of head and body ; flattened ; well haired, 
though narrow. Above, with continuous lines of yellowish, alternating 
closely with lines of spots of the same COLOL..........csscsececececvcscsseessceees 
10. Tail as in the preceding. Above, olivaceous brown, with lines of very 
distinct light spots only, these arranged in regular series................0+ ca 
11. Tail somewhat as in preceding. Above, yellowish chestnut, with nume- 
rous more obsolete light blotches, not distinctly arranged in series, most 
conspicuous on the posterior portion of the back...........sececssceeeeneeneeeeee 
12. Tail rather full; nearly half as long as the body. Above, with crowded 
indistinct subquadrate light spots. Top of the head chestnut.............+. 
13. Tail narrower ; one-third the body. Body uniform yellowish brown, with- 
out any spots, blotches, or stripes Whatever..........csscesssssseseseeveseeseeeees 
14, Tail very slender ; cylindrical ; length one-fourth the body. Above, with 
numerous crowded obsolete, light, rounded spots or blotches.............04 
douglasii. 
grammurus. 
couchii. 
lateralis. 
harrisit. 
Sranklinii. 
tereticaudus. 
tridecem-lineatus. 
mexicanus. 
spilosoma. 
parryt. 
richardsonit. 
townsendit. 
