328 Univi rsity of California Publications in Zoology [Vol. 10 



under extreme arid conditions, and not only this but at an alti- 

 tude of much lower temperature than in its usual zone, Upper 

 Sonoran. 



While at Cabezon half-grown young w'ere taken on May 16, 

 the young had but just appeared in Tahquitz Valley, July 21. 

 The difference in zone accounts for this difference in breeding 

 season. 



We have compared our San Jacinto series with C. b. beecheyi, 

 from Monterey and the vicinity of San Francisco, and with 

 topotypes of C. b. fisheri from northeastern Kern County, finding 

 the San Jacinto animal to be much nearer the latter. The 

 features as compared with fa t cheyi of west-central California, arc 

 generally paler coloration, whiter and more extended shoulder 

 stripes, and whiter, less huffy under surface. The latter appears 

 to us to be the most constant and therefore reliable feature for 

 the distinguishment of fisheri of southern California i'rom 

 In 1 1 In yi. 



Sciuropterus alpinus californicus Rhoads 

 San Bernardino Flying Squirrel 



Found at but one locality. Idyll wild, in Strawberry Valley, 

 6000 feet altitude. While camped here. July 4 to 15, we heard 

 almost every night the chuckling of Sciuropterus in the black 

 oaks and yellow pines around our beds. Number steel traps 

 and "Out-o-sigh1 " rat traps were placed on stumps and branches 

 around about, baited with dried prunes and fresh apricots; 

 but these were not touched, except by jays in the daytime. On 

 the night of July 12, four rat traps were baited with bread- 

 butter-and-sugar and placed in crotches of black oaks about 

 seven feet above the ground at the hack of "cottage number one." 

 Since various diurnal mammals regularly visited the garbage 

 cans at the rear of this and other houses in Idyllwild it might 

 be expected that nocturnal ones would also; and sure enough, 

 the following morning our first and only flying squirrel rewarded 

 our scheming. 



The specimen (no. 2088) is an old female, at the date of 

 capture long past breeding. Comparison with examples of cali- 

 fomicus from the San Bernardino Mountains (see Grinnell, 



