106 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



There is little doubt but that No. 5847, collected at San 

 Diego, is referable to Perodipus agilis simulans; the case is 

 different with No. 7181, the condition of which makes the pre- 

 cise determination of its status difficult or impossible. In the 

 writer's opinion, so far as its appreciable characters are con- 

 cerned, the specimen may be referred with equal propriety to 

 agilis or simulans. 



Perodipus panamintinus Merriam 



"D[ipodomys] Philippii" (part)?, Cooper, Zoology, in 

 Cronise, The Natural Wealth of California, 1868, p. 445 (The 

 reference is somewhat uncertain, but the probabilities point to 

 this allocation.) 



Specimen examined. — One: No. 5630, Univ. Calif. Mus. 

 Vert. Zool. ; obverse of label "249 Dipodomys 5 Chico spr." 

 Providence Mt. Cal. 1. 35° alt. 5000 ft. May 28'61 J. G. C." ; 

 reverse, nine measurements. 



Specimen prepared as usual; skull inside; fore feet folded 

 backward along sides, hind feet extended posteriorly. Tail not 

 skinned, extended posteriorly. 



In coloration and cranial characters this specimen is nearest 

 Perodipus panamintinus, though in color it is a trifle closer to 

 examples from Maturango Spring, Argus Mountains, than to 

 the typical form. It is not improbable that the specimen repre- 

 sents a local variant of P. panamintinus, but the answer to this 

 and other questions concerning the status of the kangaroo rats 

 must await a monographic revision of the group. 



Dipodomys merriami merriami Mearns 



"D{ipodomys'\ Philippii" (part). Cooper, Zoology, in Cron- 

 ise, The Natural Wealth of California, 1868, p. 445 (General 

 comments only), 



"Dipodomys Philippii Gray" (part). Cooper, Proc. Cal. 

 Acad. Sci., 4, 1870, p. 74 (Colorado Valley). 



" I have failed to locate "Chico Spring" on any of the maps examined. Cooper's 

 route from Fort Mojave to Los Angeles doubtless traversed the Pah Ute Hills and 

 Providence Mountains almost due west of Fort Mojave (see Whitney's Map of Cali- 

 tornia and Nevada, State Geological Survey of California, 2nd ed., 1874). It is 

 highly probable that "Chico Spring" is an obscure locality in the Pah Ute Hills of 

 this map rather than in the true Providence Range; for Cooper did not leave Fort 

 Mojave until May 28, 1861, and could hardly have reached the Providence Moun- 

 tains by the evening of the first day out. 



