132 Proceedings of the Biological Society of Washington. 



Collection. Collected by Vernon Bailey, September ]], 1902. Original 

 number 7963. 



General characters. — Smaller and darker colored than C. pallidum, 

 larger and darker than parvus. In general appearance much like alien i, 

 but with darker brown back and crown, and with light stripes of back 

 more continuous. 



Skull. — Short and wide as in parvus but decidedly larger and heavier. 

 In size about as in alleni but with zygomatic arches much heavier and 

 more spreading. 



Measurements. — Type: Total length, 232; tail vertebrae, 70; hind foot, 

 32. Skull of type: Greatest length, 37; basal length, 31; nasals, 12.2; 

 zygomatic breadth, 21.7; mastoid breadth, 17.3; alveolar length of upper 

 molar series, (1.4. 



Zapus luteus australis subsp. nov. 



Type from Socorro, New Mexico. No. 160,731, 9 young adult, 17. S. 

 National Museum, Biological Survey Collection, collected by E. A. 

 Goldman, August 23, 1909. Original number 20,402. 



General characters. — Small and slender, with very narrow skull. 

 Colors pale. 



Color. — Upperparts pale buti'y yellowish sparingly lined with black 

 hairs; back slightly darker lint with poorly defined dorsal area; lower- 

 parts pure white; heels dusky; feet white. 



Skull. — Small, slender and very narrow, the braincase especially nar- 

 row and rostrum slender; dentition light. 



Measurements of type, measured in held by collector: Total length, 

 205; tail vertebrae, 124; hind foot, 29.5. Skull of type: Total length, 

 21.4; basal length, 17.5; nasals, 8; zygomatic breadth, 10.7; mastoid 

 breadth, 9.5; alveolar length of upper molar series, 3.2. 



Sigmodon minimus goldmani subsp. nov. 



Type from 7 miles north of Palomas, New Mexico (alt. 4200 feet). 

 No. 167,625, 9 young adult, U. S. National Museum, Biological Survey 

 Collection. Collected October 23, L909, by E. A. Goldman. Original 

 number 20,695. 



General characters. — Closely related to S. minimus and of about the 

 same size, but darker and richer colored. 



Color. — Upperparts coarsely grizzled with white, burl' and black; ears 

 and tail almost entirely black; feet very dark and belly dark rich ful- 

 vous. 



Skull. — Very similar to that of S. minimus, but with longer and nar- 

 rower audital bullae. 



Measurements. — Type, measured in the field by collector : Total length, 

 256; tail vertebrae, 107; hind foot, 31. Young adult c? topotype, 238; 

 98; 31. Skulloi type: Total length,:;:!; basal length, 29.5; nasals, 11.3; 

 zygomatic breadth, 19.2; mastoid breadth, 15; alveolar length of upper 

 molar series, 0.2. 



