MAMMALS Of Till; MEXICAN BOUNDARY. 299 



AMMOSPERMOPHILUS LEUCURUS ( Merriam \. < 

 ANTELOPE GROUND-SQUIRREL. 



Tarnias leucurus Merriam, North American Fauna, No. 2, October 30, L889, pp. 



19-2] (original description I. 

 Spermophilus leucurus, Merriam, Proc. Biol. Sue. Washington, VII, p. l'7. April 



13, 1892. -Elliot, Field Col. Mus., Zool. Ser., II. March, 1901, p. 86. 



(''Spermophilus (Ammospermophilus) leWcurus," li^ r . is, p. 85.) — Miller arid 



Rehn, Proc. Bost. Soc. Nat. Hist., XXX. No. I, December 27, L901 (Syst. 



Results Study X. Am. .Maui, to close of 1900). 

 [(Melius (Ammospermophilus)] leucurus, Trouessart, Cat. Maui, tam viv. quam 



fossilium, Supl. Fasc. II, Rodentia, 1904, \<. 335.— Elliot, Field ('"I. Mus., 



Zool. Ser., IV, |>. 14l> i Maui. Mid. Am). 



Type-locality. — San Gorgonio Pass, southern California. (Typo, 

 skin and skull, No. f^ff, collection of Dr. ( '. Hart Merriam.) 



Geographical range. Sonoran Zone, on the east side of the Coast 

 Range Mountains, on the Mexican Lino, unci thence northeast along 

 the Colorado River, passing into the subspecies cinnamomeus in the 

 Painted Desert of northeastern Arizona, and interpret in Now Mexico 

 and Texas. Not found on the Mexican Border between the Rio 

 Grande of Texas and the Coast Range Mountains of California, its 

 range l} 7 ing to the northward. 



Description. -About the size of the eastern chipmunk ( Tarnias stri- 

 atic). Tail short and distichous. Length, 225 nun.: tsiil vertebrae, 

 75; hind foot, 39; head, do; skull. 4<» by 22.5. Mammae, 5 pairs. 

 Color above finely mixed yellowish, vinaceous, and dark brown, much 

 grizzled, grayest on the anterior half of the body, and most vinaceous 

 on the posterior half and on the outer surface of the limbs. There is 

 a broad, white, longitudinal stripe on each side extending from the 

 shoulder to the rump. Orbital ring and under surfaces white Feel 

 yellowish white. Tail grizzled, vinaceous, and black above, white 

 below, the lateral hairs once broadly ringed with black. Skull 

 with the audital bullae very large and prominent, the basi-occipital 

 being correspondingly reduced in breadth. It is very similar to 



"The follow ing subspecies occur near our limits: 



AMMOSPERMOPHILUS LEUCURUS CINNAMOMEUS iMerriam 



Tarnias leucurus cinnamomeus Merriam, North American Fauna, No. •'!, Septem- 

 ber II, 1890, p. 52. (Type-locality, Echo Cliffs, Painted Desert, Coconino 

 County, Arizona. I 



Spermophilus leucurus cinnamomeus, Bryant, Zee, III, October, 1892, p. 208. 



AMMOSPERMOPHILUS LEUCURUS PENINSULA; i Allen i. 



Tarnias leucurus peninsula Allen, Bull. Am. Mas. Nat. lli-t., V, p. 197, Aug. is, 

 L893, (Type-locality, San Telmo, Lower California, Mexico). 



[Spermophilus] leucurus peninsular, Troi essart, Cat. Mam., l't. L', 1S!»7, p. 4.S4. 



[< itellus A ucurus"] peninsula , I'.i.i [ot, Field < >ol. Mus., Zool. Ser., 1 Y, L904, p. 14.'!. 

 (Mam. Mid. Am.). 



