APR. 1903. NEW SPECIES AND SUBSPECIES OF MAMMALS ELLIOT. 165 



Color. Above and on thighs reddish brown, deepest on thighs 

 and rump, and darkest on dorsal region, which part is mixed 

 with black; sides of head and body light reddish brown, the 

 plumbeous under fur showing through at intervals; top of head 

 like dorsal region, under parts white or grayish white, caused by 

 the plumbeous under fur showing; a dark ochraceous spot on 

 sides of chest, and a paler one on middle of chest between the 

 arms; tail dusky brown above, white beneath; hands and feet 

 white; ears dark brown. 



Measurements. Total length, 170; tail vertebrae, 89; hind 

 foot, 17.5; ear, 16. Skull: occipito-nasal length, 27; Hensel, 20; 

 zygomatic breadth, 10; least interorbital breadth, 3; palatal arch 

 to alveolus of incisor, 8.5; length of nasals, 13.5. 



This harvest mouse differs from all others in Middle America 

 in the relative length of the tail, which is less than half the total 

 length. In its reddish hue it is easily recognizable from R. longi- 

 caudus as well as being larger in all its measurements. Mr. 

 Heller found the species only about San Quentin. He says it 

 was common near the coast in damp meadows, but disappears a 

 few miles inland. This species -is apparently separated from R. 

 longicaudus by R. I. pallidus, which was taken by Mr. Heller near 

 the Salado River at Trinidad and Las Eucinas. 



FAM. GEOMYID.E. 



GENUS THOMOMYS. 

 Thomomys helleri. Sp. nov. 



Type locality. Goldbeach, mouth of Rogue River, Curry 

 County, Oregon. 



Gen. char. Size medium, nearest possibly to T. douglasi, but 

 color different and tail and hind foot longer. Skull short, with 

 brain case broad, zygomata widely spread; molars small; ros- 

 trum broad. 



Color. Top of head and upper parts reddish brown, base of 

 fur black; spot behind ears, line beneath eyes, nose, lips and 

 margins of pouches black; cheeks buff; sides buff, black of under 

 fur showing through; throat and under parts plumbeous washed 

 with buff; feet yellowish white; tail above" dark K gray, beneath 

 white. 



Measurements. Total length, 209; tail vertebrae, 67; hind 

 foot, 28; ear, 8. Skull: occipito-nasal length, 36; Hensel, 28; 



