8A0GOHYIDJB— OIFODOMTIN^-DIPODOUYS. 



r)37 



posed and recognized. As they reat mnitdy upon site and pruirartiuns, thcao 

 pointa will bo Brat discussed. 



The following tables of measurements of a series of Dijfodomi/s, frvnh 

 and alcoholic, will serve to show whether or not two species, commonly sup- 

 posed to bo distinguished by size and pmportioni), intcrgrado in these resiiects. 

 The specimens are arranged without reference to locality, according to tho 

 chief point in question, namely, leng(h of tail. 



Tabls v.— JlMfi>r«n«ii>( cfmtnltm tptdwuni <\f DiroDOMTil. 





nm 



MM 

 4»T1 



MM 



TMO 

 rM4 



mm 



ions 

 rm 



LoMUIy. 



Caps Rl. Locu , 



Fort Wlli|>pl^ Aril., 

 ClmamM, N.Mvs.... 



C«|MM.I.m*i 



Fort Whipplo, Aril.. 



(Duknowii) 



CapaSt. Looai 



do 



(Uakiuwn) 



I>lau« Vallr; 



rbrtnanllBg, .Cal.. 



"Uallliiiiib"..., 



Mmtcray 



Kict T^loii, Cal . 

 "IfawkyHta.".. 



Artnp. 



Frai Up of BOM l»— 



CM 



1.00 



kOO 

 OiN 



tlM 



0.M 



aie 



LM 



i.w 



AW 



0.M 



I.4S 



LH 

 I.H 



l.« 

 1.40 



i.ae 



1.43 



k40 



I. as 

 i.e 



1. 00 

 LiO 

 I.4S 



I.SS 

 I.M 

 I.7S 

 I.4S 



I.SS 

 t.90 

 I.M 

 LSS 



1.10 

 I.B 

 1.40 



I.7S 

 1.80 

 1.70 



l.«l 



aso 

 4.n 



4.W 



aiao 

 cso 



4. IS 



xn 



xn 

 xn 



4.90 



X» 



&«s 



&00 



its 



4.90 



Tall to sad 



€lf- 



Laaglk of 



MO 

 S.00 

 S.00 

 9. IS 



xta 



SiSO 



9lTS 

 9.U 



xn 



S.7S 



^1s 



0.00 



xw 

 xn 

 roo 



7.00 



fciO 

 9.7S 



9i«S 



XK 



xn 

 xn 



0.90 



7.1V 



7.10 

 7.7S 

 7.79 

 iLtO 



9i70 t.H 



I.SS 

 I.9S 

 I.SS 

 1.40 



I.ae 



1.10 

 1.40 

 1.40 

 L4S 

 LIO 

 I.SS 

 I.W 

 1. 10 

 1.10 

 1.10 

 1.70 

 1.70 



Alaokoll*. 

 Pnab. 

 Alookolle. 

 ...it. 

 rrrl*. 

 Alcobolle. 



...ao. 



...do. 



...do. 

 ...dc 

 ...da. 



The foregoing table of mensureroents of only 17 speAimens, all adult, 

 suffices to prove an uninterrupted gradation in size of every part of the body 

 and its members. There is no break whatever in any of the absolute dimen- 

 sions. The specimens range, by minute fractions of the inch, from 3.2.5 to 

 5.00 inches in length of head and body, averaging about 4.00. The tail vertebree 

 range from 5.00 to 7.00 inches, averaging about 5.75 ; with the hairs, the tail 

 is from 5.75 to 8.00 inches, averaging a little less than 7.00. The hind foot 

 runs from 1.95 to 1.70, settling at an average of 1.58. It will be observed 

 that the lengths of tail and feet bear no constant ratio to each other, some 

 sjiecimcns with relatively smallest feet having relatinftly the longest tails. It 

 will further be evident that absolute lengths of tail and feet arc not indicative 



