772 



MONOGKAPHS OP NORTH AMEKHCAN KODENTIA. 



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

 Wagner), are as follows : — 



Soluraa varinbilia — 

 Sciarua langadurfll . . . 



Do , 



SciuruB Ifcniventrja . . 

 Sciurus pyrrhonotna . . 

 Sciurus tricolor 



Do 



Sciuraa atramiueus . . 



Looallty. 



Eastern Peru 



Ooyubn, Uatto Oroaao, Bnuil.. 



Dniall 



Klo ?1egro, Brull 



Moutb of Rio Uwlcira, Brniil.. 



Nortlieru Peru 



do 



Omntopo, Peru 



h 



10.00 



iae4 



0.83 

 11. 7S 

 II. 85 

 13.^4 



i£n 



10.00 



10. w 



S 

 S 



1 



10.16 

 11.00 



II. S5 

 11.90 

 19.00 

 13.00 

 13.10 

 13. SO 



1.90 

 1.00 

 1.03 

 1.00 

 1.00 



i.oe 



Qioted froni' 



Tachaili. 



Wagnor. 



Bnndt. 



Wigoer. 



.. d& 



...da 



TaekBdI. 



Cydonx. 



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, 'he 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 eten iar 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 surfa^'e of the 

 body, 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 jHtle soiled oi yellowish-wliite, in 

 others bright rust, with numerous intermediate stages in others. Tht 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 generoUy lighter than the post* rior 

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

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

 posteriorly. 



According to Tschudi, only /S. 'Kitramineus" occurs west of the Andes 

 Ihis species having been obtained by the naturalists of the ^^Bonite" at 

 Omatope, in Northwestern Peru, near Pnyta. 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 



