278 THOMOMYS. 



Geogr. Distr. Oregon. Range unknown. 



Genl. Char. Like T. douglasi. Skull with broader zygomata, 

 more bowed outwardly, the outer sides parallel; interparietal larger, 

 subtriangular, with straight portions emerging; pterygoid notch 

 V-shaped. 



Color. Exactly like that of T. douglasi. 



Measurements. Total length, 220; tail vertebrae, 70; hind foot, 30. 



686. Thomomys helleri Elliot. 



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

 p. 165. Zool. Ser. 

 Heller's Gopher. 



Type locality. Goldbeach, Oregon. 



Geogr. Distr. Oregon. Range undetermined. 



Genl. Char. Nearest to T. douglasi; color different; tail and hind 

 foot longer. Skull shorter; molars small; rostrum broad. 



Color. Head and upper parts reddish brown; spot behind ears, 

 line beneath eyes, nose, lips, and margin of pouches, black; cheeks, 

 sides, throat, and under parts buff; base of fur plumbeous; feet yel- 

 lowish white; tail above dark gray, beneath white. 



Measurements. Total length, 209; tail vertebras, 67; hind foot, 

 28; ear, 8. Skull: occipto-nasal length, 36; Hensel, 28; zygomatic 

 width, 19; interorbital constriction, 6; greatest width of braincase, 

 14; mastoid breadth, 13.5; length of nasals, 11; width of rostrum, 6; 

 palatal length, 5; length of mandible, 19; height at condyle, 7; at 

 coronoid process, 11 ; length of upper tooth row, 7. 



687. Thomomys limosus Merriam. 



Thomomys limosus Merr., Proc. Biol. Soc. Wash., xiv, 1901, p. 116. 

 Mud-loving Pocket Gopher. 



Type locality. White Salmon, Gorge of the Columbia, Klickatat 

 County, Washington. 



Geogr. Distr. Washington. Range unknown. 



Genl. Char. Similar to T. douglasi, but darker. Skull with z3-go- 

 mata bowed outward, nasals restricted behind anterior third, ex- 

 panded and emarginate posteriorly; interpterygoid space V-shaped; 

 angular process of mandible spreading. 



Measurements. Total length, 224; tail vertebrae, 68; hind foot, 29. 



688. Thomomys talpoides (Richardson). 



Cricetus talpoides Rich., Zool. Journ., iii, 1828, p. 518. 

 Geomys borealis Rich., Rep. Brit. Ass. for 1836, vi, 1837, p. 156. 

 Thomomys talpoides Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 

 II, 1901, p. 227. Zool. Ser. 



