162 [September, 



those above described in being darker colored, and brown above, rather than 

 rufous ; the head is darker, the breast is slightly tinged with brown, the chin and 

 inside of the cheek pouches more distinctly white, and the sides of the mouth 

 dark fuscous. As, however, I can find no specific characters of importance, I 

 am obliged to consider it as a variety. Its dimensions are as follows : 



Length from nose to root of tail, *J'5 



" Tail, , . 2-9 



Fore foot to end of third claw, !! 



Hind foot to end of third claw, 1-25 



7. G. Douglasii, "supra fuliginosus, subtus pallidior, capite nigricante ; 

 sacculis buccalibus, pedibus caudaque albidis ; dentibus primoribus omnibus eulco 

 subtili submarginali signatis." 



Inches. Lines,. 



Length from nose to root of tail, .... 6 6 



" Tail, 2 10 



Fore foot with longest claw, .... 1 



Hind foot with longest claw, .... 1 2 



Richardson Fauna Bor. Am. 200, pi. 18, C. 1 6, (Skull.) ; Aud. and Bachm 

 pi. 105. 

 Ascomys Douglasii Wagner, Schreber Saugeth. Suppl. 3, 392. 

 Geomys fuliginosus Schinz, Syn. Mam. 2, 136. 



Columbia River. Richardson in his generic description mentions that the ears 

 have an elevated margin ; the species is cited in the Zoology of Beechey's Voyage, 

 page 22, but as no further account is given of it, I have of course omitted that 

 reference. Schinz has created an unnecessary synonym by neglecting to observe 

 that plate 18B, of Fauna Boreali- Americana, represents in reality Geomys bulbi- 

 vorus, and is lettered by mistake Diplostoma Douglasii. 



8. G. t alp old es, "supra subtusque cano-niger, gula caudaque brevialbis, 

 pedibus posticis subtetradactylis ; dentibus primoribus superioribus sulco sub- 

 marginali." 



Inches. Lines. 

 Length from nose to root of tail, ... 7 4 



i.3ill 



Fore foot with middle claw, 

 Hind foot with longest claw, 



Richardson, Fauna Bor. Am. 204 ; Schinz, Syn. Mam. 137. 

 Cricetus ?talpoides Richardson, Zool. Journal, 2, 518. 

 Ascomys talpoides Wagner, Schreber Saugeth. 1. c. 390. 

 P seudostoma talpoides Aud. and Bach. Quadr. Am. 3, 43, pi. 110. 

 Hndson Bay ; Saskatchewan? " Ears slightly margined." 



9. G. u m b r i n u s , " supra umbrinus, subtus griseus, gula pedibusque albidis, 

 dentibus primoribus laevigatis." 



Inches. Lines. 

 Length from nose to root of tail, ... 7 



JLaii, ...,...JL " 



Fore foot to end of third claw, .... 10 



Hind foot to end of third claw, .... 1 



Richardson, Fauna Bor. Am. 202 ; Schinz, Syn. Mam. 137. 

 Ascomys umbrinus Wagner, 1. c. 389. 



' Cadadaguios, Louisiana." This species has been seen by no one but Rich- 

 ardson ; it seems by description very similar to the next, but by the generic de- 

 scription of Richardson it ought to have a distinct margin to the ears. 



10. G. b ulbi vorus, "supra inter castaneoet flavido-fuscum intermediug, infra 

 griseo-fuscus, labiis, maxilla inferiori sacculisque albidis, cauda pallide brunnea. 



1 10 



10 

 11 



lOj 



