MAY, 1903. A 'LIST OF MAMMALS ELLIOT. 191 



that it was difficult to trap them during the rainy season. They 

 were especially common in the onion beds of vegetable gardens. 



B. THOMOMYS. 

 Thomomys leucodon. 



Thomomys leucodon. Merr. , Proc. Biol. Soc., Wash., 1897, 

 p. 215. Elliot, Syn. N. Am. Mamm., 1901, p. 223. 



Six specimens (topotypes), Grant's Pass, Rogue River Valley, 

 Oregon. 



Thomomys bottae. 



Thomomys bottae. (Edy. and Gerv.), Mag. Zool., 1836, p. 23, 

 pi. xxi., fig. 4 (teeth). Elliot, Syn. N. Am. Mamm., 1901, p. 223. 



Twelve examples: i, Nacasio; 6, Petaluma; i, Mendocino; 4, 

 Requa, California. 



Thomomys laticeps. 



. Thomomys laticeps. Baird, Proc. Acad. Nat. Scien., Phila. , 1855, 

 p. 335. Elliot, Syn. N. Am. Mamm., 1901, p. 224. 



Thirty-one specimens: 16, Eureka (Table Bluff, Humboldt Bay, 

 topotypes); 6, Requa; 9, Crescent City, California. 



Mr. Heller states that this species was abundant on the hillsides 

 about the Bay, but not found about Scotia, or in the redwood timber. 

 Many of the specimens from Humboldt Bay and occasionally one from 

 Crescent City have the lower incisors pure white as in T. leucodon 

 which lessens the specific value of that character considerably. 



Thomomys helleri. 



Thomomys helleri. Elliot, Pub. Field Columb. Mus., in, 1903, 

 p. 165, Zoology. 



Eleven specimens from Goldbeach, Oregon. 



FAM. ZAPODID^. 



ZAPUS. 

 Zapus trinotatus. 



Zapus trinotatus. Rhoads, Proc. Acad. Nat. Scien., Phil., 1894, 

 p. 421. Elliot, Syn. N. Am. Mamm., 1901, p. 261. 



Twenty-five specimens: 6, Crescent City; 4, Requa; n, Eureka, 

 California; 4, Goldbeach, Oregon. 



In this series great differences are observable in size and colora- 

 tion among the specimens, caused by age and change of pelage from 

 the summer to autumn when the dull-hued flanks are assumed. This 



