SACCOMS W2E— PEROGNATHIDINiE— P. MONTICOLA. 



511 



this is undoubtedly the effect of alcoholic discoloration, the parts being, no 

 doubt, white in life. The tail is bicolor, to correspond with the body colors. 



While there is no question whatever of the distinctness of the subject 

 of the present article from any others described in this paper, there are some 

 points to be considered respecting its reference to P. monticola of Baird. The 

 type of this species, now before me, has been mounted and exposed to the 

 light for about twenty years ; it is faded and otherwise in poor state, the end 

 of the tail and much of the fur being lost. The color is now a uniform dull 

 grayish-brown, much like the natural color of P. penicillatus, instead of 

 "mixed cinnamon and dusky", as originally described; and the tail is uni- 

 formly dingy white, instead of being "colored to correspond"; the hairs 

 below are all white instead of "plumbeous at base"; and no lateral stripe is 

 now appreciable, though an 'indistinct" one was mentioned. But the main 

 peculiarity of the species as to coloration, namely, the descent of the dark 

 color down the fore leg to the wrist is still evident ; and, in short, I find no 

 color-differences not explicable upon consideration of the comparative state 

 of the two specimens. We may therefore turn to the matter of size and pro- 

 portions. Professor Baird says, "tail rather shorter than head and body," 

 giving the length of the former as 2.67+, and of the latter as 3.00 ; whereas 

 my animal is but 2.50 long, and has a tail of 3.20. But the decided discrep- 

 ancies in these statements and measurements are readily reconciled upon the 

 simple consideration that the tail is defective and the body overstuffed in the 

 type of monticola. This brings about an agreement further borne out by the 

 other measurements. In the following table, the first line of measurements 

 is copied from Baird ; the other is taken from the Fort Crook sjiecimen, 

 upon which this article is based, before skinning out of alcohol. 



Table II. — Measurements of two specimens of Perognathus monticola. 



The principal discrepancy being explicable as above, there is nothing 

 whatever in the foregoing table incompatible with specific identity. More- 



