432 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.47. 



are characters that make the closer relationship seem very probable. 

 Though distinctly belonging with Peromyscus, Podomys is the nearest 

 approach within that genus to Onycliomys. 



List of Species and Subspecies with Type-Localities. 



Onychovnjs lexicogaster . 



0. I. leucogaster (Wied) Fort Clark, North Dakota, p. 434, 



0. 1, missouriensis (Audubon and Bachman) Fort Union, Montana, p. 438. 



0. 1, arcticeps Rhoads Clapliam, New Mexico, p. 439. 



0. I. brevicaudus Merriam Blackfoot, Idaho, p. 441. 



0. I. fiiscogriseus Anthony Ironside, Oregon, p. 443. 



0. I. melanophnjs Merriam Kanab, Utah, p. 444. 



0. I. fuliginosus Merriam Black Tank, Arizona, p. 447. 



0. I. ruidosx Stone and Rehn Ruidoso, New Mexico, p. 448. 



0. I. capitulatiis Hollister Grand Canyon, Arizona, p. 450. 



0. 1, albescens Merriam Samalayuca, Chihuahua, p. 450. 



0. I. longipes Merriam Concho County, Texas, p. 451. 



0. 1, breviauritus Hollister Fort Reno, Oklahoma, p. 453. 



Onychomys torridus. 



0. t. torridus (Coues) Camp Grant, Arizona, p. 456. 



0. t. perpallidus Mearns Yuma County, Arizona, p. 459 . 



0. t. pulcher Elliot Morongo Pass, California, p. 461. 



0. t. longicaudus Merriam St. George, Utah, p. 463. 



0. t. darus Hollister Keeler, California, p. 465. 



0. t. tularensis Merriam Bakersfield, California, p. 466. 



0. t. ramona Rhoads San Bernardino Valley, Califor- 

 nia, p. 468. 



0. t. macrotis Elliot San Pedro Martir Mountains, 



Lower California, p. 469. 



0. t. yakiensis Merriam Camoa, Sonora, p. 470. 



0. t. canus Merriam San Juan Capistrano, Zacatecas, 



p. 471. 

 0. t. surrufus nobis Miquihuana, Tamaulipas, p. 472. 



Brief Synopsis oy the Characters of Species and Subspecies. 

 Size averaging larger; tail relatively short, usually less than half the length of head 

 and body; skull averaging larger, with comparatively narrow interorbital region; 

 teeth higher crowned, unworn cusps of m' higher than long; m^ larger, subcir- 



cular; m* usually less than half the length of tooth row O. leucogaster. 



Color of adults in fresh pelage light; distinctly buffy or cinnamon; not fuscous, 

 sooty, or brownish. 

 Hairs of underparts entirely white, without dark underfur. .0. 1, albescens, p. 450. 

 Hairs of underparts white, with gray underfur. 



Size small (hind foot 17-20 mm.; skull, condylobasal length, 23.8-26.0); color 



grayish-buff 0. I. brevicaudus, p. 441. 



Size large (hind foot 18.5-23; skull, condylobasal length, 24.8-27.7); color pink- 

 ish-cinnamon-buff. 



Color duller and paler; face lighter 0. I. arcticeps, p. 439. 



Color richer and darker; face darker 0. I. melanophrys, p. 444. 



Color of adults in fresh pelage dark; fuscous, sooty, or brownish; not distinctly 

 buffy or cinnamon. 

 Ear tufts white or whitish, conspicuously different from color of crown. 



Size smaller, with smaller skull (condylobasal length, 24.4-25.2; breadth brain- 

 case, 12.4-12.9) ; ears larger (14.5-15.8) 0. I. fuscogriseus, p. 443. 



