82 



NORTH AMERICAN FAUNA. 



[NO. 39. 



New Mexico: Burro Mountains, 2; Capitan Mountains, 36; Chloride (10 miles 

 east), 1; Cliff, 1; Cloudcroft, 7; Cloudcroft (10 miles north), 1; Coppermines, 

 1; Copperton, 6; Corona, 6; Carasal (Bernalillo County), 3; Datil Mountains, 

 7; Fairview, 1; Folsom, 2; Fort Wingate, 2; Gallina Mountains, 1; Gila, 5; 

 Glen wood, 1; Guadalupe Mountains, 6; Halls Peak, 7; Head of Mimlres, 2; 

 Hoskins Ranch (Colfax County), 2; Jicarilla Mountains, 5; Kingston (about 

 4 miles west, 9,500 feet altitude), 2; Long Canyon (3 miles north of Catskill), 

 1; Luna, 3; Luna (6 miles southwest, 7,000 feet), 5; Magdalena Mountains 

 (Copper Canyon, 8,200 feet), 1; Magdalena Mountains (Water Canyon, 6,500 

 feet), 1; Manzano Mountains, 12; Mimbres River, 1; MogoUon Mountains, 7; 

 Mora (10 miles south), 4; Mount Capitan (east base), 1; Pecos, 2; Pleasanton, 3; 

 Quemado (10 miles southwest), 2; Raton Range (near Folsom), 3; Rio Ala- 

 mosa (15 miles north of OJo Caliente, 6,900 feet), 1; Ruidosa, 7; San Andres 

 Mountains, 6; San Mateo Mountains (Monica Canyon, 8,000 feet), 2; San 

 Pedro, 2; Sierra Grande, 4; Silver City, 12; Fort Stanton, 3; Fort Union, 1; 

 Zuni Mountains, 5; Zuni River, 1. 



THOMOMYS FULVUS PERVAGUS Merriam. 



ESPANOLA POCKKT GoPHER. 

 (PI. IV, fig. 5.) 



Thomomys aureus pervagus Merriam, Proc. Biol. Soc. Washington, XIV, 110, 1901. 



Type. — Collected at Espanola, New Mexico, by J. Alden Loring, 

 January 4, 1894. Type specimen in U. S. Nat. Mus.; Biological 

 Survey collection. 



Distribution. — Upper Rio Grande and San Luis Valleys in northern 

 New Mexico and southern Colorado (fig. 8). 



CJiaracters. — Size large, hind foot 31-33 mm.; color Ughter than in 

 fulvus; skull longer and heavier; mammae in 4 pairs. 



Color. — Summer pelage: Upperparts plain bright tawny; nose, 

 cheeks, and ear patch blackish; underparts paler tawny; feet whit- 

 ish; tail dusky above, usually to tip. Winter pelage: Shghtly duller 

 above and below. 



SJcull. — As in fulvus, but longer, narrower, and with less-spreaduig 

 zygomatic arches, and slightly larger audital bullae; differing from 

 aureus in less arched palate, emarginate nasals, and V-shaped 

 pterygoids. 



Measurements. — ^Type (d ad.): Total length, 244; tail vertebrae, 

 76; hind foot, 31. Average of 4 topotypes ( c? ad.): 239, 73, 32.3. 

 Average of 5 females: 224, 68, 31.4. Slcull (of type): Basal length, 

 42; nasals, 15.5; zygomatic breadth, 27; mastoid breadth, 21; alve- 

 olar length of upper molar series, 8. 



RemarJcs. — In characters pervagus stands so nearly between fulvus 

 and aureus as to suggest that it forms a connecting link between the 

 two groups, but in a large number of specimens, collected since the 

 species was described, the affinities are unifoTmXj with fulvus instead 

 of aureus. It is evidently a paler, more robust. Upper Sonoran val- 

 ley form of fulvus inhabiting the upper Rio Grande and San Luis 

 Valleys. 



