328 TJnivi 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 were taken on May 16, 

 the young bad 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 ('. 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 wit h In < clu yi of west -central ( 'alifornia. are 

 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 r distinguishment of fisheri of southern California Prom 

 In i (In yi. 



Sciuropterus alpinus calif ornicus Rhoads 

 San Bernardino Flying Squirrel 



Found at but one locality. Idyllwild. in Strawberry \ alley. 

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

 almost every nighl the chuckling of Sciuropterus in the black 

 oaks and yellow pines around our beds. Number <> steel traps 

 and " Out-O-sight " 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 nighl 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 back of "cottage number one." 



Since various diurnal mai als regularly visited the garbage 



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

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

 the following morning our lirst 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- 

 fornicus from the San Bernardino .Mountains (see Grinnell, 



