226 FIELD COLUMBIAN MUSEUM ZOOLOGY, VOL. i. 



Color. Upper parts dark cinnamon, grizzled with tawny ochra- 

 ceous; slightly paler on the flanks. Under parts whitish, slightly 

 darkened by the plumbeous of the under fore, legs and feet white. 

 Tail above same color as the back, beneath white. Ears short, 

 covered thickly with hair, and colored like the upper parts. 



Cranial Characters. Brain case longer and narrower than that 

 of P. orophilus, the frontals narrower and the orbital construction 

 greater. Nasals shorter and narrower posteriorly. The basi- 

 occipital is very much narrower at its junction with the basi- 

 sphenoid than is seen in the skull of the species compared, 

 and the pattern of the teeth is somewhat different. I hope to 

 give an illustration of this skull in the paper that will be pub- 

 lished on the collection. 



Measurements. Type. Total length, 125 mm. ; tail, 27; hind 

 leg, 15; ear, 10. The largest specimen measures 150 mm; tail, 

 31; hind leg, 15; ear, 9; and the average of five examples is, 

 total length, 100.60; tail, 27.6; hind foot, 14.7; ear, 10. 



Microtus (Lagurus) pumilus. 



Type. Happy Lake, Olympic Mountains, Challam Co. , Wash- 

 ington; about 5,000 feet. Collected August 18, 1898. 



Characters. Apparently the nearest described species to the 

 present one is M. curtains Cope. That, however, is much larger 

 and lighter in color. The tail of the present species is longer 

 than that of M. curtatus. Ears small, hidden in fur. 



Color. Entire upper parts and sides, a grizzled blackish brown 

 and dark russet, in certain lights the latter color predominating; 

 beneath whitish, with the plumbeous under-fur showing con- 

 spicuously; feet and legs, white; tail, above blackish brown, be- 

 neath white. 



Cranial Characters. Skull, similar to that of M. curtains, but 

 smaller, with relatively less wide frontals and less anterbital con- 

 struction. Palate narrows considerably anteriorly. Auditory 

 bullae very large. 



Measurements. Total length, 92 mm.; tail, 21 ; hind leg, 13 ; 

 ear, 5. Measurements of M. curtatus compared are as follows : 

 Total length, 105 mm.; tail, 17 ; hind leg, 22; ear, 9.5. 



Peromyscus akeleyi. 



Type. Johnson's Ranch, Elwah River, Olympic Mountains, 

 Washington. Collected July 31, 1898. > 



