1886.] PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 411 



Having adopted these two species, it becomes desirable to ascertain 

 in how far thej are commensurate with the Dipodomys phillipsi [typi- 

 cms)* and Dipodomys ordi of Dr. Coues, the latest writer upon the genus. 



To this end I have remeasured the entire alcoholic series oi Dipodomys 

 in the collection of the National Museum. 



Specimens having ^ toes on the kind foot. 



Locality. 



Dr. Coues' 

 identifica- 

 tion. 



^-2 





OJ3 



S478 

 7345 



Washington Territory. 

 Crossing Little, Colo. . . 



2621 

 7344 

 4871 



10722 

 2025 

 7348 

 4870 



14064 



Coaliuila, Mexico 



Platte Valley, Nebraska 



CimaiTon, N. Mex 



No locality 



San Francisco, Cal 



Fort Tejon, Cal 



Fort Laramie, Wyo 



Fort Walla WaUa,"Wash. 



D. phillipsi 



mm. 



97 

 106 

 114 



99 

 105 

 105 

 101 



97 

 109 

 100 

 103 



103.4 



mm. 

 40 

 41 

 43 

 38 

 39 

 41 

 39 

 38 

 46 

 40.5 

 40 



40.5 



771 Wl. 



136 

 127 

 '170 

 133 

 151 

 130 



156 

 174 

 148 

 144 



mm. 



24 

 23 

 24 

 22 

 23 

 25 

 23 

 22 

 25 

 22 

 22 



TOW., 



35 

 36 

 41 

 35 

 37 

 38 

 35 

 35 

 42 

 35 

 35 



mm,. 

 6 



7 



8 



7 



8 



7 



9 



7.5 



7 



mm,. 

 12 

 15 

 17 

 13 

 13 

 11 

 14 

 15 

 17 

 13 

 13 



mm. 



12.5 



13 



12.5 



10 



11 



13 



10 



12 



13 



14 



12 



41 

 41 

 44 

 36 

 40 

 40 

 39 

 42 

 45 

 41 

 39 



tl4L 1 



23.2 



36.7 



7.4 



13.8 



40.7 



Percentages 



+138. 5 



Dipodomys phillipsi (4 hind toes). 



4922 

 4922 

 4970 

 4970 

 4970 

 4970 

 15109 

 12408 

 2627 

 2626 



Mohave village 



do 



Cape Saint Lucas 



do 



do 



do 



No locality 



Rocky Mountains 

 Fort Reading, Calfornia 

 do ....:'. 



Averages . 



Percentages 



D. phillipsi 

 D. phillipsi 

 D. phillipsi 

 D. phillipsi 



D. phillipsi 

 D. phillipsi 



d i 87 



109 

 80 



82 



37 

 37 

 36 

 38 

 36 

 38 

 37 

 42 

 33 

 37 



37.3 



131 

 145 

 148 

 *117 

 135 

 147 

 159 

 187 

 148 

 149 



tl50 



41. 2 tl84. 5 



23 



22 



23 



23 



22.5 



23 



23 



20 " 

 2L5 



t22.3 



7.5 



7 



8 



7.5 



7 



7 



7.5 



'7'" 



7 



34.3 t7.27 



127.4 



37.9 



12.5 



12. 5 



11.5 



13.5 



12 



13 



11.5 



15 



13 



15 



12.9 



10 



9.2 



9 



9.5 

 10 



9 

 11 



t9. 9 



{12.2 



38.2 



42.2 



* Broken. 



t Average for 9 specimens. 



+ Percentage for 9 specimens. 



It will be perceived upon examination of these tables that the four- 

 toed specimens have relatively longer tails, ears, and feet than the five- 

 toed series. In respect to each of these characters the former series 

 agrees with the series which Dr. Coues called D. phillipsi {typicus). I 

 quote from his monograph, page 539 : " The western animal averages 

 smaller and of more slender build, with larger ears and longer limbs, 

 and especially longer tail." These differences hold good for my four- 

 toed series. The portion of Dr. Coues' diagnosis of his D. phillipsi 

 ordi bearing on these characters is as follows: "Larger: rather over 

 than under 4 inches in length of head and body, with (comparatively) 

 stout shape, small ears, short limbs, and short tail." (p. 541.) 



* I add this subspecific uame in order to prevent confusion in the remarks I have 

 to make upon the two varieties recognized by Dr. Coues. 



