•)•> 



MOXOliUAI'IlS OK NORTH AMERICAN KODENT1A. 



copus, yel (lie singularly different //. californicus (parasiticus of Cooper) also 

 occurs (here; and that some of the samples of "gambeli" seem to tend a 

 little toward californicus. Here appears to We the gateway, both in Hesperomys 

 and in Neotomee, that leads out from an ordinary type into a localized differen- 

 tiation. We must confess that we suspect that certain intermediate JYeotomee 

 and Hesperomys will yet be found in this region to show us the steps of depar- 

 ture from N.Jloridanas into fuscipes and from H. leucopus into californicus. 



The skull of N. fuscipes shows nothing diagnostic ; a slight narrowness 

 of the post-palatal notch being shared by the other western and Mexican 

 forms. One example, No. 2040, measures 2.15 in length by 1.15 across the 

 zygomata. 



Table III. — Measurements of six specimens of Neotoma fuscipes. 



NEOTOMA FERRUGINEA, Tomes. 



Neotoma ferruginea, Tomes, rroe. Zcol. Soc. 1801, 281. (From Guatemala, Described as bright rufous, 

 mixed with black hairs on the back, below pure white, the line of deinarkation distinct. 

 Length (>" f>"', head 1" 9'", fore foot 8'", hind foot 1" 2'", tail 0".) — Coues, Proc. Acad. 

 Nat. Sci. Phila. 1874, 17. r ,. 



Diagnosis. — (No. 9507, Mus. Smiths., ex Tchuantepec.) — N. aureo-ferru- 

 ginca, dorso obsairiore, infra nivea, auriculis subnudis, plantis fere nudis, caudd 

 nigricante unicolore, truncum cum capite subcequante, metatarsi* supra ex alb/do 

 fuscesccnlibus. Long. tot. 7.50 poll.; caudce 6.50; pedis 1.40; auricula 0.90. 



Upper parts of a rich rusty-red, almost golden-rust, color along the sides ; 

 on the back obscured with considerable admixture of blackish hairs; the line 

 of demarcation on the sides very sharp: the color of the upper parts (or a 

 duskier hue) running down the outside of the legs to the wrists and ankles; 

 the superior surfaces of the feet of most of the specimens white, clouded with 

 dusky, sometimes the dusky strongly predominating, in other specimens, how- 

 ever, hardly or not appreciable. Extremity of muzzle colored; but, on the 

 sides of the lip, the white reaching up to the roots of the whiskers, while just 

 behind this the ferrugineous dips abruptly downward, so that the outline 

 of the white and ferrugineous is far from a straight line. Below snowy-white ; 



