306 



U. S. P. R. R. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT 



2. Similar to the preceding. The interval between the hoary patches dark 



brown, nearly black 



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 

 marked contrast 



4. Color entirely black 



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. COLOBOTIS, 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. 



1st. 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 



*T. Mottled yellowish gray and brown. Head pure gray, without any tinge 



of yellowish 



2d. Ears very short, apparently wanting, in the dried sldn. 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 wit/h 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 color 



10. Tail as in the preceding. Above, olivaceous brown, with lines of very 

 distinct light spots only, these arranged in regular series 



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 



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 



14. Tail very slender ; cylindrical ; length one-fourth the body. Above, with 

 numerous crowded obsolete, light, rounded spots or blotches 



douglasii. 



grammurus. 

 couchii. 



lateralis. 



harrisii. 



franklinii. 



tereticaudus. 



tridece m-lineatus . 

 mexicanus. 



spilosoma. 



parryi. 



richardsonii. 



townsendii. 



