RODENTIA—SACCOMYINAE—DIPODOMYS PHILLIPII. 413 
The general distribution of color is much as in D. ordii and other species of the genus ; upper 
parts yellowish brown, with a little dusky intermixed ; lighter on the sides. Sides of snout, 
spot above the eye behind the ear, a stripe crossing the groin from the belly to the base of the 
tail, fore legs, tarsi and feet, with the under parts generally, pure white. Tail white, with a 
smoke-brown stripe on the upper side from near the white base to the tip of the tail, and another 
on the lower side nearly to the tip, where it becomes obsolete. On the terminal third of the tail, 
however, the dark marking is confined more and more to the tips of the hairs, and at its 
extremity the general impression is that of a white tuft. 
A specimen from Los Angeles, No. 41, is in more mature condition. In this the head is 
narrower than in D. ordii, and with somewhat the same ground color, has this more relieved 
by dusky tips to the hairs on the head and back. It agrees in locality with the D. agilis of 
Gambel. 
I am very far from satisfied that this species, as described above, is really distinct from what 
I call D. agilis, as the characters seem to me too intangible to distinguish them. There are 
various shades of gradation in the colors of the terminal portion of the tails. Generally the 
dusky inferior stripe runs out about an inch from the end of the vertebre, leaving the end of 
the tail white, with only a tinge of plumbeous on the upper surface and tip, the basal and 
larger portion being white. Sometimes, however, the prevailing impression is plumbeous 
instead of white. 
Two specimens—one from California, precise locality unknown, the other from Fort Reading— 
have the entire tip of the tail, all round, for about half an inch before the end of the vertebra, 
well defined white, without any plumbeous. Just before the white tip the tail appears to be 
plumbeous all round. In the Fort Reading specimen the tail is unusually long ; in the other 
it is only moderately so. The colors of these specimens are quite dark, more like the D. agilis, 
as described. 
List of specimens. 
= es rt ] 
3 Measurements. 
: | 
5 roe 
2|% a 3 Blalele 
§ S A - 2 Ey rPlsilo|s 
Ea a Locality. When col- | Whence and how ob- | ‘Nature of gleielialSisleis Collected by— 
e to | bo lected. tained. = specimen.| >/ 3/3/32 slslale 
a |¢ i g/o|%s 
> |a|s a sisieis/|®/ieiaia 
oi|#/§ a Bh bas &)3/] mh) & 
SIEIE bo alaial|/al/sl/slela 
= =] Ky y=] i) ° 3 C) co | Co) o 
Oo |/O/n fo) 214 )a| eS le |e haa 
?2628")....] +s».| Southern California ....|..6...eeeeee Te G. Bell, siscnsecasecse -eee Skin, in ale.|....|ee00|.0-/eee+|0.106.97 +501 GD ifadapiinctlocniarce 
41°) 943) Q Los Angeles, Cal....... July 21,1847) Wm. Hutton........... cece SKiN-cceeee coveleccclecee|Ze20/0eldlecee| e00 1.54! seovcecccecccce 
1679*|....|....| Los Angeles,or Monterey).....+eeeeee Lt. W. P. Trowbridge..|.... .... do...... WT sies'e 1.60.4,12 6.50/7.12 eee |LcOd|\vesieicccel) osnse 
472°) ....|+++.| Posa creek, Cal ........ 1853. eevee Lt. R. 8. Williamson...|.... Mounted ..|....)....|.+.|4.67/7.25,8.25),.../1.55|/Dr, Heermann,. 
S70") wwulasia si wavel=nee Os vinssenvcececs 1853. ecccccleceevcss GOs, eereseecseesiecee veers dO... oes. coeelocce| voerl[4 I2G.L |vccelecce| Lean] essecs dO. seccee 
2626'|..../..0.| Fort Reading, Cal ....../seessseeeees Dr. J. F. Hammond....|.... Inale...... +80 1.25/1.40'3,25)6.10).... 045,160) vevecescvccevee 
PERT essa} asicailovesevntdQroweccnesis anse|ccccecisecnee|snecccce dO. sevevevevees see! wines lOr peels -89)1,33/1.53'3.35}5,83}....| .49)1.60) ....ssseccecece 
9954} .ccsleves Fort Walla Walla, O.T.) 1854....... Dr. Geo. Suckley .....- 51 Skin....... eee|evcelcee| sees lds f[OcO2].000/LoO0] ones cocce cscs 
| 
+ Hairs at tip of tail pure white. 
® Hairs at tip of tail white at base, with dusky tips. 
® Terminal brush pulled off. 
« Very similar to 472 and 473, 
