Bailey — Ten New Mammals from New Mexico. 131 



side instead of one, and lower surface of tail pale chestnut at a certain 

 age when nearly full grown, but never light yellowish as in the same 

 stage <>t' lateralis. 



Skull. — Slightly larger than in lateralis, with wider bullae and heavier 

 molars but generally lighter incisors. 



Measurements. — Type: Total length, 292; tail vertebrae, 102; hind foot, 

 44. Average of 7 adult male topotypes, 2X2 ; 99; 42. Weighl of type, 10 

 ounces, skull. — Type: Greatest length, 45.4; basal length, 40:5; nasals, 

 16; zygomatic width, 28.5; mastoid width, 23; alveolar length of upper 

 molar series, 8.5. 



Rema-rks. — This really well-marked form has been long confused with 

 lateralis, owing to the lack of specimens in comparable pelage. The 

 present series in the Biological Survey Collection represent a large num- 

 ber of localities and covers practically every phase of pelage in both 

 forms. 



The type is taken from an Arizona locality, but the range of the sub- 

 species extends throughout the Mogollon .Mountains of New .Mexico. 



Citellus variegatus juglans subsp. now 



WALNUT ROCK SQUIRREL. 



Type from ( rlenwood, New Mexico, at 5000 feet altitude on the Rio San 

 Francisco, at the southwest base of the Mogollon Mountains. No. 148,289, 

 c? ad., I'. S. National Museum, Biological Survey Collection. Collected 

 by Vernon Bailey, November 2, 1906. Original number 8587. 



General characters. — In size and general external appearance closely 

 resembling C. variegatus from southern Mexico, but not so dark and 

 with a broader skull and smaller teeth. 



Color. — Upperparts dark brownish gray with considerable blackish over 

 head and ears, back coarsely variegated with irregular black tipped white 

 crescent- or wavy crossbars. Lowerparts varying from soiled whitish to 

 rusty ochraceous; feet plain ochraceous. 



Skull. — Low and wide as in variegatus but with smaller molars, 

 broader jugals, and almost quadrate instead of falcate anterior base of 

 zygoma. Braincase wider and relatively lower than in grammurus. 



Measurements. — Type: Total length, 500; tail vertebrae, 230; hind foot, 

 65. Female from near type locality, 488; 215; 00. Skull of type: 

 Greatest length, 61.4; basal length, 55; nasals, 22; zygomatic breadth, 

 38; mastoid breadth, 27.5; alveolar length of upper molar series, 12. 

 Weight of type, 1 h. lbs. 



Remarks. — From Citellus variegatus couchi and rupestris this form 

 differs in lighter dentition and in lack of the black cap. From C. gram- 

 murus it differs in low, wide skull and dark coloration. 



Citellus tridecemlineatus hollisteri subsp. nov. 



Typi from the Sacramento Mountains, New Mexico (alt. 8000 feet), 

 on the pari of the Mescalero Indian Reservation known locally as Elk 

 Valley. No. 119,025, 9 a 'J., U. S. National Museum, Biological Survey 



