ocr., 1899.] MAMMALS, 93 
In Ash Creek Canyon Walter Fisher found their cuttings to consist 
chiefly of ferns and willows—the latter carried from a Jong distance. 
In Mud Creek Canyon the cuttings consisted chiefly, according to 
W. H. Osgood, of thimble-berry bushes, mountain ash, and brake 
ferns—the latter predominating, and in one place forming a pile as big 
asa bushel basket. The animals commonly live in colomes, but Osgood 
concluded that in Mud Creek Canyon only one individual, or at most. 
a pair, lived in one place, “though several may be distributed among 
the branches of a stream.” 
Mus musculus Linn. House Mouse. 
Abundant at Sisson, and running wild like the native species. R. 
T. Fisher reported them as constantly getting into his traps, partic- 
ularly in the weeds and sedges in wet places along the banks of Cold 
Creek, where he caught a dozen or more. 
Reithrodontomys klamathensis sp. nov. 
Type from Big Spring (‘Mayten’), Shasta Valley, Calif. No. 95444, g ad., U.S. 
Nat. Mus., Biological Survey Coll. Collected Sept. 18, 1898, by W. H. Osgood. 
Orig. No, 281. 
Characters.—Size medium; ears and hind feet large; tail long, only 
slightly shorter than in longicauda; color grayish or brownish gray, 
decidedly paler than longicauda. 
Color.—Summer pelage: Upperparts pale grayish brown, washed 
with butfy ou sides; underparts white, tail bicolor, dusky above, 
whitish below. 
Cranial characters.—Skull rather large; braincase and rostrum rel- 
atively broad; audital bullae small. The skull as a whole agrees better 
with that of megalotis than with that of longicauda, particularly in the 
length of palate and breadth of braincase; but the rostrum is broader 
and the audital bulle are smaller than in either. 
Measurements,—Type: Total length, 149; tail vertebrie, 71; hind foot, 
19. Average of 2 adults from type locality: Total length, 144; tail 
vertebrx, 66; hind foot, 18.5. 
Remarks.—Both in color and cranial characters Reithrodontomys 
klamathensis resembles the pale grayish R. megalotis of the desert 
region of the southern part of the Great Basin much more closely than 
it does the dark brownish R. longicauda of California west of the 
Sierra. 
This new harvest mouse is common in wet places in Shasta and Lit- 
tle Shasta valleys, where four specimens were obtained by W. H. 
Osgood and R. T. Fisher. They were caught in little runways in wet 
grass near tules. The species doubtless reached Shasta Valley by way 
of the open Klamath country. During our explorations in eastern 
Oregon in 1896, numerous specimens of the same species were caught 
by my assistants, E. A. Preble and Cleveland Allen, in the tule marshes 
bordering the streams connecting Malheur and Harney lakes. 
