May, 1899. MAMMALS FROM OKLAHOMA TERRITORY ELLIOT. 281 



suffused with rust or orange color. Forehead with a small spot 

 at side of nose pale pink, in some specimens orange. Breast, 

 near the feet on front legs, and center of abdomen pale chest- 

 nut; rest of under part plumbeous, with a silvery sheen in most 

 lights. Front feet broad and powerful, hind feet slender, flesh 

 color. Nose prominent, extending beyond the mouth, flesh 

 color, as is also the short tail. 



Cranial characters. With S. m. texanus, the difference in size 

 is so considerable that a comparison of their skulls is quite need- 

 less. Compared with that of .S 1 . a. machnnus, that of the Oklahoma 

 animal is smaller in all its general measurements, and there are 

 also other considerable differences. The nasals while shorter 

 are equally as broad as in the northern form, and the maxillae are 

 much more swollen outward anteriorly in conformity with the 

 outward curve of the upper tooth row. The least inter-orbital 

 width is greater than that of 6". a. machrinus, and the brain case 

 is narrower in the widest part for its relative length. From the 

 hamular process of the pterygoids to the extreme point ip the 

 palatal notch the distance is greater in the new sub-species, and 

 the palate from the notch to the- alveolus of incisor inside, is 

 shorter, but equally as broad in the widest part. The molars are 

 as large, if not larger, than those of ^. a. machrinus, but the pre- 

 molars are smaller. The angle of the mandible in the last 

 named form, and the coronoid process at base, are wider. 



Measurements. Total length, 167 mm. Tail, 33. Hind foot, 

 22. Width of hand, 18. 



Skull. Occipito-nasal, length, 34 mm. Greatest mastoid 

 breadth, 17.5. Least inter-orbital breadth, 13. Hamular process 

 of pterygoid to palatal notch, 6. Palatal length from notch to 

 alveolus of incisors, inside, 14.5. Greatest breadth inside molars, 

 6.; greatest outside molars, n. Greatest breadth of maxillae, n. 



This mole while resembling in color and the prevalence of 

 rusty or orange hues the 5. m. texanus is altogether too large to 

 be identified with that sub-species. In size it is much nearer S. 

 a. machrinus, but in color does not agree with it, having the gen- 

 eral hue much too light for even the palest example of the north- 

 ern sub-species that I have seen. Several specimens were 

 obtained by Mr. Surber, all agreeing in size and color. 



3. Reithrodontomys chrysotis, sp. nov. 



Type locality. Dougherty, Oklahoma Territory. Adult $ . 

 Collected April 12, 1899, by Thaddeus Surber. 



