NO. 2057. THE GRASSHOPPER MICE—HOLLISTER. 467 



sides, and entire underparts white, the haire of chin and tliroat white 

 to bases; rest of underparts with narrow undercolor of gray. Tail 

 sharply bicolor; grayish-brown above, whitish below, with whitish 

 tip. Adult in summer (149793, Stanley, California, July 1): Upper- 

 parts grayish-cmnamon, with little luster and with considerable 

 admixture of gray from the underfur; upper face dark ashy. Juve- 

 nile (129968, Santiago Springs, California, July 30): Lighter colored 

 than young of ramona; darker, more ashy, than young of longicaudus 

 or jmlcJier. Upperparts, including legs above to ankles, ecru-drab, 

 finely streaked and darkened by the blackish hair tips ; below whitish, 

 the hairs barely darkened to a pale grayish-white at bases. Post- 

 juvenile pelage (128409, Santiago Springs, California, August 14): 

 General color above light drab, less ashy than in the juvenile, and 

 without the pinkish cast of old adults; upper face not darker than 

 back. This pelage is apparently worn until late in the second summer. 



Slcull. — Anterior palatine foramina about reaching plane of fronts 

 of first molare. Posterior edge of palate never distinctly concave, 

 but normally truncate, and frequently convex, but with no distinct 

 spine projecting into interpterygoid space. 



Measurements. — Averages and extremes of four adults: Total 

 length, 144 (141-148) millimeters; tail vertebras, 52.3 (51-54); 

 huid foot, 20.8 (20.0-22.0); ear from notch in dry skin, 14.6 

 (14.0-15.1). Skull: Condylobasal length, 23.5 (23.2-24.0); zygo- 

 matic breadth, 12.9 (12.5-13.3); interorbital breadth, 4.7 (4.5-4.9); 

 breadth of braincase, 11.6 (11.3-11.8); length of nasals, 9.2 (8.9-9.5); 

 length of mandible, 13.4 (13.1-13.7); maxillary tooth row, 3.7 

 (3.5-3.8). For detailed measurements of specimens see page 482. 



TyiJe-S'pecimen. — No. ^mi, United States National Museum, Bio- 

 logical Survey collection. Skin and skull of female young adult (teeth 

 slightly worn) ; moulting the post-juvenile pelage and renewing into 

 first fall pelage of adult, probably second summer. Collected July 

 19, 1891, by Dr. A. K. Fisher. Orig. No. 792. 



Remarlcs. — The adults of this form differ conspicuously in color 

 from adults of all the neighboring subspecies of torridus. The San 

 Joaquin grasshopper mouse is a decidedly grayish-drab colored race, 

 becoming slightly more cinnamon or ochraceous in faded summer 

 coat, before the moult. The differences in seasonal pelage are much 

 less than in any other of the northern races, and are not so readily 

 definable. 



Specimens examined. — Total number, 20, from localities as follows : 



California: Alcalde, 1; AUla, 2; Bakersfield, 1 (type); Carriso 

 Plains, 1; Coalinga, 1; Delano, 1; Famoso, 1; Huron, 2; Little 

 Panoche Creek, 1 ; McKittrick, 1 (Univ. of Calif.) ; Santiago Springs, 

 2; Stanley, 2; Weldon, 4 (Univ. of Calif.). 



