3 Bulletin American Museum of Natural History. [Vol. V, 



NOTE ON Sciurus arizonensis COUES. A large series of 

 skulls of this species, recently presented to the American 

 Museum of Natural History by Dr. Edgar A. Mearns, by whom 

 they were collected at various localities in Arizona, shows that 

 this species belongs to the Parasciurus group, the upper premolars 

 being \ instead off, as formerly supposed. When treating of this 

 species in 1877,* no skulls were available for examination, and 

 from its general resemblance in coloration to Sciurus carolinensis 

 it was referred, erroneously as it now appears, to the same section 

 of the genus. Parasciurus thus proves to have a nearly transconti- 

 nental range, instead of being an exclusively * Eastern ' genus, 

 as recently assumed by the present writer. 2 It also has a wide 

 range in Mexico, occurring in the Sierra Madre region southward 

 into the States of Zacatecas and Vera Cruz, where it is repre- 

 sented respectively by S. nayaritensis Allen and S. niger melano- 

 iiotus Thomas. 



12. Cariacus virginianus (subsp.?). Several imperfect flat 

 skins, including two with skulls and feet, and two separate skulls 

 of does. The skins include one that is pure white (albino). 

 Bavispee River, October, 1890. 



A full-grown male has antlers of the usual style of C. virginianus, 

 but another specimen shows that old bucks sometimes develop 

 antlers of large size, with very numerous tines, the left antler in 

 this specimen having eight points and the right one six points; 

 they are, however, unsymmetrical in the two antlers and represent 

 an abnormal development. This head strongly suggests the 

 remarkable growth of points seen in some specimens of C. v. 

 leucurus. The length of the left antler measured along the con- 

 vexity of the beam is sixteen and one-half inches ; the length of 

 the principal tine is six inches. 



In coloration these specimens closely resemble C. v. leucurus, 

 but are rather lighter, with a whiter tail. They apparently repre- 

 sent a much larger form than Baird and some other authors 

 have recognized under the name Cariacus mexicanus. 



13. Mephitis estor Merriam.Two specimens, San Diego, 

 northern Chihuahua, Oct. 28. 



1 Monographs of N. Am. Rodentia, pp. 738-741. 



2 This Bulletin, IV, p. 218. 



