1912] Kellogg: Pleistocene Rodents of California 165 



In the skull the width between the premaxillae and the an- 

 terior width of palate are less than in Citellus b. fisheri. The 

 bullae are relatively long and narrow. In the lower jaw, the 

 tooth row is long and the teeth heavy in proportion to the size 

 of the ramus ; the coronoid process, angle, and condyle are small. 



15 



Fig. 12. Citellus b. captus, n. subsp. Inferior view of skull, no. 11264. 

 Fig. 13. Citellus b. captus, n. subsp. Superior view of skull, no. 11264. 

 Fig. 14. Citellus b. captus, n. subsp. Eight lower mandible, no. 12404. 

 Fig. 15. Thomomys b. pallescens. Right side of skull, no. 11269. 

 Fig. 16. Sylvilagus auduboni. Left upper tooth row, no. 1870. 

 Fi<>s. 12 to 16 natural size. 



On the whole, this form seems to be a relatively small one, 

 although comparisons with Citellus b. fisheri show only slight 

 differences in measurements of some of the parts. Taken as a 

 whole the known differences seem sufficient ground for at least 

 subspecifie differentiation. The comparative measurements are 



