MAMMALS 301 



0. /. articeps Rhoads. Like 0. I. missouriensis, but still paler, 

 buff in color: Wyoming and South Dakota; southward to southwestern 

 Texas. 



0. I. brevicaudus Merriam. Size small; length 141 mm.; color 

 darker than O. I. articeps: southern Idaho, northern Utah and Nevada. 



0. l.fuscogrisens Merr. Color darker; size small : eastern and central 

 Washington and Oregon. 



0. I. melanophrys Merr. Color dark, being pinkish-cinnamon: 

 southern Utah and Colorado and northern New Mexico and Arizona. 



0. I. ruidoscB Stone & Rehn. Color dark: southern New Mexico 

 and southeastern Arizona. 



O. I. longipes Merr. Size large; length 190 mm.; tail 48 mm.; 

 hind foot 25 mm.; color dull: central and southern Texas. 



0. /. breviauritus Hollister. Like 0. I. longipes, but darker and 

 with a shorter tail and hind foot : eastern Nebraska and central Kansas 

 and Oklahoma. 



0. torridus (Cou€s) . Body fulvous brown above and white beneath; 

 length 150 mm.; tail 50 mm.; hind foot 20 mm.: southwestern United 

 States; Mexico. 



Subspecies of 0. torridus 



0. t. torridus (Coues). Southwestern Texas, southern New Mexico, 

 southeastern Arizona and northern Mexico. 



0. /. perpallidus Mearns. Size larger: western Arizona. 



0. t. pulcher Elliot. Size small; length 136 mm.; color 

 very pale: deserts of southern California. 



0. t. longicaudus Merriam. Size large; color pale: 

 southwestern Utah; northwestern Arizona, Nevada and Inyo 

 and Mono counties, California. 



0. /. tularensis Merr. Color grayish drab above : upper 

 San Joaquin Valley, California. 



0. t. ramona Rhoads. Color very dark: southwestern p^^ 161 — 



California. incisor teeth 



2. Reithrodontomys GigHoli. American harvest mice, tomys mega- 

 Body small and slender; tail long, being a third or a half ^Melrns)^°^^ 

 the body length; ears prominent; anterior face of upper 

 incisor with a deep longitudinal groove (Fig. 161); sole of hind foot 

 with 6 plantar tubercles: 50 species, in tropical and subtropical America; 

 6 species in the United States; mainly nocturnal animals which live 

 in open, grassy places, often near water, and feed upon grains, fruits 

 and vegetables. Most species build a globular nest of grass often 



