324 PROCEEDINGS OF THE ACADEMY OF [1897. 



length of nasals, 11.5; frontal constriction behind postorbital pro- 

 cesses, 8.4; interorbital constriction, 8.3 ; greatest length of mandi- 

 ble, 21.8. 



General remarks. — The San Bernardino or Sierra Madre flying 

 squirrel, true to its environment, has assumed the characteristic pale- 

 ness of the Southern California mountain mammalia as contrasted 

 with their near allies of the Cascade Range. In size and general 

 proportions it seems to be intermediate between fuliginosus and 

 oregonensis ; in color it probably comes closest to alpinus, but is 

 much grayer. Its skull is almost as small as in oregonensis, and the 

 characteristic relative narrowness of the posterior frontal constric- 

 tion distinguishing the alpinus group from sabrinus is very pro- 

 nounced. 



Mr. Herron makes the following interesting notes on this subspe- 

 cies : '' Those four flying squirrels are the only ones I have taken 

 in this country. They were all taken from. dead pine trees or stumps, 

 in holes made by the red-shafted flicker, from 10 to 30 feet from the 

 ground. * * * * Unlike the eastern species, I do not believe 

 they have their young in nests made of leaves placed in the branches 

 of trees, as I have never seen nests of this kind in the mountains, 

 but I think they have their young in these deserted woodpeckers' 

 nests. Their food, I think, is mostly acorns. They were all taken 

 at an altitude of about 5,200 feet, near Squirrel Inn. I would say 

 they range from four to six thousand feet altitude, as they have 

 never been seen in Bear Valley some 30 miles farther east on the 

 same range, and about 8,000 feet altitude." 



Specimens examined. — California, San Bernardino Mountains, 4. 



4. Sciuropterus alpinus oregonensis (Bachman). Bachman's Flying Squirrel. 1 ' 



1839. Pteromys oregonensis Bachman, Jour. Acad. Nat. Sci., Phila., VIII, 

 p. 101. 



1877. Sciuropterus volucella var. hudsonhis Allen, Monog N. Amer. Rod., p. 

 655. 



1881. Sciuropterus volucella b. oregonentis [sic] Trouessart, Cat. des Mam., 

 p. 67. 



Type locality. — " Pine woods of the Columbia [River] near the 

 sea." Probably near St. Helen, Columbia Co., Oregon. 19 



1S This name is more distinctive than " Oregon " or " Pacific Coast " Flying 

 Squirrel, as the mountains of both these regions are inhabited by fuliginosus, 

 and it is probable that the lowland coast form of northern California is a dis- 

 tinct race. 



19 In •' Townsend's Narrative," page 177, it is stated that he secured ''several 

 new species of birds and two or three undescribed quadrupeds" during his 

 residence with Nuttall on a brig moored "near the lower mouth of the Wal- 

 lammet." This was during the early part of November, 1834. 



