772 



.MONOCKAIMIS of NOKTII AMKIMCAN RODENTIA. 



The measurements of these species, as given by authors (mainly by 

 Wagner), arc as follows: — 



Namo. 



Sciurus variabilis . .. 

 Sriunis laogedorffi . 



Do 



Solurufi iguivontris . . 

 Sciurus pyrrlioDotus. 

 Sciurua tricolor 



Do 



Sciurus stramiueus . . 



Locality. 



Eastern Peru 



Cuyuba, Matto Groaso, Brazil., 



Brazil 



Rio Negro, Brazil 



Mouth of Rio Madeira, Brazil. 



Northern Peru 



.....do 



Omatope, IV ru 



Quoted from- 



Tsrliinti. 

 W.l^IIIT. 



Brandt. 



U'l^Inr. 



.. do. 

 ..do. 

 TBchndi. 

 Eydoux. 



My single specimen (a mounted example) from Manaos, Brazil, exceeds 

 the largest of these measurements by nearly an inch (English scale), but 

 agrees in coloration with Wagner's S. pyrrhonotus. As, however, the meas- 

 urements given in the table are in the larger German inches, the difference 

 is more apparent than real. The whole range of variation in size and color 

 is not greater than usually occurs among the Sciuri, and is even for less 

 than is often met with. There is the same style of coloration in all; the 

 same short, thin, stiff pelage and long, pointed ears. The coloration of the 

 lower parts in all is sharply separated from that of the upper surface of the 

 bod} r , reference to which is made by almost every author in describing these 

 several supposed species. The lower surface varies only in the amount of 

 rufous, being, in some specimens, only pale soiled or yellowish-white, in 

 others bright rust, with numerous intermediate stages in others. The dorsa 

 surface varies in respect to the greater or less prevalence of black or red, and 

 in the tint of the red, which is sometimes yellowish-red, sometimes dark rust- 

 red. The anterior half of the body is generally lighter than the posterior 

 half, the color generally increasing in intensity posteriorly. All have the tail 

 more or less red at Ihe base, passing into yellowish-red or deeper red 

 posteriorly. 



According to Tschudi, only S. " stramineus" occurs west of the Andes, 

 this species having been obtained by the naturalists of the "Bonite" at 

 ( hnatope, in Northwestern Peru, near Payta. S. variabilis he gives as ranging 

 chiefly in the upper forest region, east of the main Andean chain, and as not 

 often occurring below 2,000 feet. Between 9° and 12° south latitude, it is 



