RODENTIA—SACCOMYINAE—DIPODOMYS AGILIS. 415 
cannot be questioned. Although by no means certain that the true D. phillipit of Gray is the 
California one, it is yet highly probable. 
If there be but two North American species, they would be readily characterized, independently 
of color, as follows: 
Dipodomys ordii. Tail vertebrae, about 1} times the length of the head and body ; rarely 
exceeding 5 inches, never 54. Hind feet moderate, not exceeding 1.50 inches, or about one- 
third the length of the body. 
Dipodomys phillipii. Tail vertebree about 1} times the length of the head and body ; always 
exceeding 54 inches, usually from 6 to 7 inches. Hind feet larger, usually exceeding 1.60 
inches, or more than one-third the length of the body. 
There would then remain, as generic characters, the yellowish brown to dusky brown 
back, the white belly, white line across the thighs, the dark stripes on the upper and under 
surface of the tail, with the intervening white lateral one on either side. The dusky line under 
the hind foot is also common to both. 
List of specimens. 
| 
| Measurements. 
= } 4 
a S | a GT + 
-|5 Blzie/si2|.| | 
EI Ein Locality. Whence andhow ‘Nature of | | i sis g EZ) 3  ¥ Collected by— 
A i i 9) 4 = s)2 | 
A a & obtained. specimen. a g 3 3 i ba é S | = Ss 
a = z Salon laa leet ici esa bees tl | |S: = 
= o |3a FS] Sal | Sosa) 2 Sie aes 
=! a o o o CN head | 4 to) = | SS 
= ee ts Ss/Si/S)/S/S/eBI/S/S5/5 (2S 18 
‘S) Oo |m 2/4/42 /42/8/8 |H/H}/Hl|F\e 
2625 |......|....| San Francisco, Cal..... Lt. W. P. Trowbridge..| In ale. ....| .86)1.43)1.56 Ho \tetiU|t 60) cules anae! seis atu uicsde eeedne este 
489 | 1630 |....| San Diego or Monterey. |..+.+++..- dO. voocccsces Skin .....- ceases {L.00 6.17) ..00{1.50/1.39 188 150.0... ccccescecs 
1 San Diego, Cal... ....00 |e ceeecees do do eve Ways welled lwarnareten sha e's's A. Cassidy .... 
1063 |...... Rewahoanve'y Oss jnceec vee cece leccesccnes dO. caesccsuee linlGie dead ae nee |eenulen Da LO) owe AS) ve waieeias! de dialeaeee dO. cccscoee 
1348 |...00. O | Fort Yuma, Cal........ Major W. H. Emory...| Inale. ....| .55| .851.03)..../2. .36/1.10 A. Schott...... 
72624 |...... O'lecscee dO.. saceeee nieeesewecs GOs. vecvcccccs ec OAR eco seeeleeee lowes! AOL LAO]. ce les cclecee eeees GOs anders 
DWE eb O. | 8 ace. AOssianssakiaeevlenies Major G. H. Thomas... .. Oman ders .56| .90/1.07/2. 9,25] ‘cdl Le LOlp is dedeaine taldiaaite nee tnleupeeaieeete 
The following species of Dipodomys, indicated very briefly by Dr. Leconte, I know nothing of. 
DiropoMys HEERMANNI, Leconte, Pr. A. N. Sc. Phil. VI, April, 1853, 224. 
Tail as long as the head and body; hair at the tip scarcely longer ; antitragus very short, 
indistinct. Tail brown, becoming black towards the extremity, with a broad white vitta on 
each side; tip, pure black. Specimen not quite adult. Sierra Nevada, collected by Dr. Heer- 
mann. 
Drropomys wa@nerI, Leconte, In. 
Based on a specimen in the Philadelphia Academy, labelled ‘‘ James Reed, South Carolina.’’ 
As no species are known east of the eastern base of the Rocky Mountains, this is probably an 
error, if intended to indicate a locality. Supposed to belong to the division with tail much 
longer than the head and body. Agrees in color with D. agilis. ars larger, antitragus large, 
broad, and obtusely rounded at its summit. Outer portion of tail wanting. 
