1916] Taylor: A New Spermophile from the San Joaquin Valley 17 
the same species. According to present records there is a gap between 
the ranges of the two from about the vicinity of Huron, Fresno 
County, northward to a point within 18 or 20 miles of Los Banos, 
Merced County; but it is not improbable that wide-spread collecting 
in the region of this seeming gap would demonstrate continuous 
distribution and geographic intergradation. 
Measurements.—Of the type: Total length, 260 mm.; tail verte- 
brae, 75; hind foot, 43; ear, 7; greatest length of skull, 43.1; mastoid 
width, 21.6; interorbital constriction, 10.5; length of nasals, 13.1. 
Males average slightly larger than females. External measurements 
of 15 males: Total length, 249 mm. (max. 267, min. 234); tail 
vertebrae, 73.1 (max. 78, min. 66) ; hind foot, 41.3 (max. 44, min. 40). 
Corresponding measurements of 16 females: Total length, 238 (max. 
256, min. 230) ; tail vertebrae, 72 (max. 78, min. 67); hind foot, 40 
(maxe 43°) min: 31/9) 
External measurements of 31 adults, combining both males and 
females: total length, 243.6 mm. (max. 267. min. 230) ; tail vertebrae, 
72.5 (max. 78, min. 66) ; hind foot, 40.6 (max. 44, min. 37). 
Crania of four males: Greatest length of skull, 42.2 mm. (max. 
43.1, min. 41.5); mastoid width, 21.4 (max. 21.6, min. 21.2); inter- 
orbital constriction, 10.2. (max. 10.5, min. 9.9); length of nasals, 
12.4 (max. 13.1, min. 12.2). Corresponding measurements of three 
females: Greatest length of skull, 40.1 (only one specimen measured) ; 
mastoid width, 21.1 (max. 21.7, min. 20.5, two specimens measured) ; 
interorbital constriction, 9.7 (max. 10.2, min. 9.2); length of nasals, 
12.0 (max. 12.5, min. 11.6, two specimens measured). 
Cranial measurements of seven adults, combining both males and 
females: Greatest length of skull, 41.8 (max. 43.1, min. 40.1); 
mastoid width, 21.38 (max. 21.7, min. 20.5) ; interorbital constriction, 
9.9 (max. 10.5, min. 9.2) ; length of nasals, 12.3 (max. 13.1, min. 11.6). 
NOTES ON THE DISTRIBUTION AND LIFE HISTORY OF 
AMMOSPERMOPHILUS NELSONI NELSONI 
Distribution.—This species was first made known by Dr. C. Hart 
Merriam in 1893 (pp. 129-131). That its distribution is general in 
the southern San Joaquin Valley is indicated by the accompanying 
map (see fig. 1). Actual records, as published by Merriam, pertain 
to the following localities: Tipton (type locality), Tulare County ; 
Alila (now known as Earlimart), Tulare County; Huron, Fresno 
