264 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



black tipi)e(l with white on its sides ami tcnniiial third, yellowish on 

 jiiedian area of upper surface, and grayish on the corresponding part 

 of the under surface. 



Remarks. — This chickaree was not seen alive, though it is said to 

 occur at times on the Laguna and Cuyamaca Mountains, 15 to ;20 

 miles north of the Mexican line in southern California. Skins were 

 brought to Campo, near Monument No. 240, Avhich were said to have 

 been taken at Laguna Grande, about 50 miles farther south, in the 

 mountains of Lower California. Doctor J. A. Allen regards this as a 

 species; Mr. Nelson as a subspecies of Schinis douglasn. Its rela- 

 tionships can not be finally determined until specimens have been 

 obtained from intermediate localities. 



Subgenus HESPEROSCIURUS Nelson (1898). 

 WESTERN GRAY SftUIRRELS. 



Dentition.— I. Je}; P. f^f; M. gEi=--- 



Without ear-tufts; interpterygoid fossa shorter than in Parasci- 

 Mr?AS', longer than in Seiiiriis; premolars, f; the anterior upper pre- 

 molar smaller than in Schirus, larger than in Trimia.'<ciur(/s; molar 

 teeth unusually robust ; skull similar to that of Neosriin^i/s, but broad- 

 ened posteriorly and more depressed, Avith the zygomatic ^^rocess of 

 squamosal thrown out horizontally, and the zygomatic arch inclined 

 less obliquely ujnvard. 



SCIURUS GRISEUS ANTHONY! (Mearns). 

 ANTHONY GRAY SQUIRREL. 



SciiiniK fOKKor anthoDul Meakns, Proc. IT. S. Nat. Mus., XX, 1898, p. 501 

 (pp. 1, 2 of advance .sheet issued March 5, 1897; original description). — 

 Mn.LEK and Rehn, Proc. Bost. Soc. Nat. Hist., XXX. No. 1, I>ec. 27, 

 1901. p. 300 (S.vst. Results Study N. Am. Mam. to close of 1900). 



Sciurus fofisor, Allen, ]Monogr, N. Am. Rodentia, 1877, p. 731 (in small 

 part; only as to No. .363.3, from Fort Tejon, southern California). 



t^eiurus griseus, Nelson, Proc. Washington Acad. Sci., I, p. 83, May 9, 1S9S 

 (part). 



[tSciunis (iriseys] anthouiji, Elliot, Field Col. Mus., /ool. Ser., II, 190L ]). 

 57 (Synop. Mam. N. Am.). 



[/SfcmrH.s] (jrhcus, Elliot, Field Col. ]Mus., Zool. Ser., IV, Pt. 1, 1904. p. 1.30 

 (Mam. Mid. Am.). 



Type-locality. — Campbell's ranch, Laguna Mountains, San Diego 

 County, California. (Type, skin and skull. No. ()092S, U.S.N.M.) 



Geographical range. — Transition zone of mountains of the interior 

 of southern and Lower California. 



Description. — Largest of the tree squirrels (Scii/ri) on the Mexican 

 Border of the United States. Length, 570 mm. ; tail to end of verte- 

 brae, 290; tail to end of hairs, 370; width of outsj^read hairs of tail. 



