280 



BULLETIN r,C), UNITED STATES NATIONAL MUSEUM. 



where new hair is coming in, or where the young in nursing removed 

 the walnut juice, the hair is pure while. At the first molt after the 

 walnut-eating season is past the pelage becomes pure white. Indi 

 viduals having the pelage discolored invariably have their palms 

 stained also, while those living away from walnut trees have white 

 bellies and clean hands. Those killed in August at the summit of 

 the Huachuca Mountains, at an altitude of 0,000 feet, and far above 

 the limit of walnut trees, always had white bellies, while those shot 

 at the same season in canyons wooded with walnut almost invariably 

 had the belly discolored. 



Habits and local distribution. — We found tins squirrel abundant 

 in the Huachuca Mountains, but failed to discover it in any of the 

 neighboring mountains. In the Huachucas it was found from near 

 the lower timber line to the actual summit (2,887 meters or 0,472 

 feet). As remarked by Mr. Nelson, a specimen from the east side 

 of the Santa Catalina Mountains, Arizona, between the type locali- 

 ties of arizonensis and huachuca, is intermediate between the two 

 forms. For this interesting specimen I am indebted to Mr. Herbert 

 Brown. As long ago as September 2G, 1884, I learned of the pres- 

 ence of this squirrel in the Huachuca Mountains, from Lieut. Harry 

 C. Benson, who found it within 2 miles of Fort Huachuca. In July 

 and August, 1803, it appeared to be feeding chiefly upon black 

 walnuts, and w T as usually found near streams. 



Measurements of 20 specimen* of Sciurus arizonensis huachuca. 



Museum 

 numbers. 



Skin. 



Skull. 



Sex and 

 age. 



Locality. 



Date. 



-a ~ 



S3 o9 



— > 



'5 



H 



58897 



58898 

 58899 

 58905 

 21387 

 58896 

 21415 

 58895 

 58847 

 58861 



58957 

 58966 

 58958 

 58964 

 58961 

 58965 

 68962 

 58963 

 58959 

 58960 



58897 

 58898 

 58899 

 58905 

 361G9 

 58896 

 36979 

 68895 

 5884.7 



68861 



68957 

 58966 

 58958 

 58964 

 58961 

 58905 

 58962 

 58963 

 58959 

 58960 



2418 

 241!) 

 2121) 

 2421 

 2422 

 2423 

 2121 

 2438 

 2582 

 2663 



.KNl 



887 



'.Hie, 

 917 

 918 

 '.il'.t 

 937 

 938 

 988 

 1067 



J ad. 

 cfad. 

 9 ad 

 5 iid. 



f ad. 



f ad. 



f ad. 

 9 ad. 

 ' im 

 — ad. 



9 ad. 

 ' ad. 

 <f ad. 



', ad. 



V ad. 



9 juv. 



j ad. 



' tm. 

 ? ad. 

 cf ad. 



Huachuca Mountains, Arizona... 



....do 



....do 



....do 



....do 



.do 

 .do 

 .do 



.do 



1893. 

 July 18 

 ....do... 

 ....do... 

 ....do... 

 July 19 

 ....do... 



mm. 

 512 

 532 

 530 

 638 

 508 

 540 



mm. 

 240 

 257 

 240 

 250 

 240 

 255 



mm. mm. 



70 23 



East side of Santa Catalina Moun- 

 tains, Arizona. 

 Huachuca Mountains, Arizona... 

 do 



.do. 

 .do . 

 .do 

 .do. 

 .do. 



.do . 

 .do . 

 .do. 



....do... 

 July 31 

 Oct. 16 

 Winter. 



July 25 

 July 29 

 Aii S . 3 

 Aug. 8 

 Auk. 10 

 Aug. 11 

 Aug. 14 

 ...do... 



Aug. 29 

 Oct. 4 



515 



525 2( 12 



75 



520 

 551 



540 



506 

 496 

 512 

 466 



266 



274 

 263 



254 

 238 



250 



202 



