154 University of California Publications in Zoology. (Vou. 
Perognathus californicus dispar Osgood. Allen Pocket Mouse. 
This pocket mouse was the only species found on the Pacific 
side of the mountains. We trapped it on the lower Santa Ana, 
near the Narrows, and on the upper Santa Ana, opposite the 
mouth of Foresee creek, a mile or so above Seven Oaks, and at 
the mouth of South Fork. The latter station is at an elevation 
of over 6200 feet, and well within the Transition zone. Small 
young were taken there July 12 and 23, 1906, and adults on other 
dates. An adult male trapped near the mouth of Foresee creek 
July 13, 1905, held in its left cheek-pouch twelve and in its right 
sixteen, shelled wild rye seeds. These are long acicular grains, 
and were laid in the cheek-pouches all one way, like a bundle 
of bamboo tooth-picks. 
The thirteen specimens referred to this-species are large as 
compared with specimens of dispar from the Pacific slope of Los 
Angeles county, and of course very much larger than the related 
californicus from Santa Clara county. It looks as though there 
is a large mountain form on the Pacific slope of the San Ber- 
nardinos. I can see no distinetive color characters however. 
Ten full-grown examples from along the course of the Santa 
Ana river, 3000 to 6200 feet altitude, show the following measure- 
ments : 
Tail 
No. Sex Date Altitude Total length vertebre Hind foot 
977 io) June 12, 1905 3000 ft. 204 115 25 
1130 2 July 10, 1905 5100 ft. 219 129 28 
1163 2 July 14, 1905 4800 ft. 207 115 27 
1121 2 July 9, 1905 5100 ft. 193 103 26 
981 9 June 14, 1905 5000 ft. 202 110 26 
1695 2 July 8, 1906 6200 ft. 198 118 26 
1162 6 July 14, 1905 4800 ft. 230 134 28 
1156 6 July 138, 1905 4800 ft. 215 121 26 
1155 6 July 13, 1905 4800 ft. 220 128 26 
1728 6 July 21, 1906 6200 ft. 205 122 27 
Lepus texianus deserticola Mearns. Desert Jack Rabbit. 
Jack rabbits, solely of this species, were common in the sage 
flats about Doble and the north end of Baldwin lake, 6800 to 7200 
feet altitude, where examples were secured and preserved in 
August, 1905. They were also noted at Saragossa springs, north- 
west of Gold mountain, and on Cactus Flat, 6000 feet, further 
