284 PKOCEEDINGS OF THE ACADEMY OF [1894. 



Evotomys pygmseus sp. nov. Type Xo. 247, ad. 9, (Wl, of S. N. Rhoads, 

 montli of Xisqually Eiver, Pierce Co., Wasliington. Col. by S. N. R. 



Description. — Size smallest of any described species of the genus. 

 Color above a rusty gray, lighter than c/cqjperi, dai'kei^t along the 

 top of head and back ; sides and belly muddy ash-gray. Margins 

 of ears and upper third of tail sooty. Feet light gray. Skull short 

 and wide, with relatively wide and flaring zygoma and brain case 

 and broad interorbital region. The audital bulUie are very much in- 

 flated, spheroidal, separated medially by less than 1 mm. , their greatest 

 transverse diameter being only 1 mm. less than the longitudinal. 

 The dentition is intermediate between that of E. orcideiitalis and JE. 

 californium, with the anterior lower molar of califomicus and the 

 posterior upper molar of occidentalls. In the latter case, however, 

 the two anterior lateral triangles are completely closed in jyygmmiis, 

 the second not connecting with the third as figured by Dr. Merriam^ 

 for occidentalis. The nasals do not i*each the posterior points of the 

 premaxillai'ies by li mm. 



MeasnremenU. — Total length, 120 mm; tail vertebrse, 34; hind 

 foot, 16. Skull — Total length, 21 ; l)asilar length, 18'4; zygomatic 

 width, 12; length of nasals, 6; incisors to post-palatal notch, 9; 

 interorbital constriction, 4-1 ; length of mandible, 12. 



The single specimen on which I have based the above diagnosis is 

 the only one of the genus secured by me in the Pacific coast district of 

 the northwest. It was captured under a log in the dense spruce 

 forest which covers the blufi' overlooking Puget Sound, at the 

 mouth of the Nisqually River. It is fully adult, with well-worn 

 teeth. This species may be known externally from its nearest geo- 

 graphic congeners by its small size. In color it is much lighter than 

 occidentalis, and (from the description) even paler than californicus. 



Evotomys gapperi saturatus sulwp. nov. Type No. 483, ad. 9. foil, of S. N. 

 Rhoads, Nelson, British C'oluinbia, Aug. 17, 1892. Col. by S. N. R. 



Description. — Size and proportions of E. gapperi, but much 

 darker, the " red" of back being dark chestnut, the sides and belly 

 dark grayish- plumbeous without ochraceous tints of gapperi. The 

 upper half of tail sooty black, strongly defined against gray of 

 lower half. Compared with that of gapperi, the skull is relatively 

 narrower, the nasals longer, the nasal premaxillary processes reach- 



' N. Amer. Fau., No. 4, Plate II, Figs. 1 and 2. 



