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22 



MOXO(il{Al'US OV NOKTII AMEUICAN KODENTIA. 



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copus, yot. the siiifjularly difrcrcnt //. californicus (parasiticus of Cooper) also 

 occurs tlicre; and tliat some of the samples of "gaml)cli" seem to tend a 

 little toward ca/iforniciin. Here appears to be the gateway, both iii Hesperomijs 

 and in A^eofoma;, ihai leads out from an ordinary type into a localized ditTeren- 

 tiation. We must confcs.8 that wc suspect that certain intermediate Ncotoma 

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

 ture from N. Jloridanas inU) fuscipcs and from H. kucopus into californicus. 



The skull of A'", fuscipcs 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. 



NEOTOMA FERRUGINEA, Tomes. 



A^eotemo /trniffiiiffl, ToMi-s, Pioc. ZiiOl. .Sw. ItHil, 2.^1. (I'mm Guiitetimla. D«sciibe<l nH bright rufous, 

 inixcd with black liuirs on Ibu back, below [iiiro wbitp, tbe line of deninrkutioii distinct. 

 Length (i" (>'", bead 1" 9'", fore foot 8'", bind foot 1" 8'", tail 0".)— CoUKS, Pnw. Acad. 

 Nut. Sci. Phila. 1874, 17.5. 



Diagnosis.— (No. 9507, Mus. Smiths., ex Tehuantepec.)— iV. aureo-fcrru- 

 ginea, dorso obsciiriore, infra nivca, auriculis suhnudis, plantis ferii nudis, caudd 

 nigricante unicolore, truncum cum capite suhcequante, metatarsis supra ex alhklo 

 fuscescenlibuK. Long. tol. l.bi) po//.; criudce G.50; pedis 1.40; auricula 0.90. 



Upper parts of a rich rusly-red, almo.st golden-rust, color along the sides ; 

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

 of demarcation on the sides very sharp: (he 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 (he feet of most of the s|)ecimens white, clouded with 

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

 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, wiiile just 

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

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



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