7G0 



MONOGBAPna OF NORTH AMERICAN KODENTJA. 





m 



l!« 



! ■' [ 



•M -i 



1 1'\ 



hi' 



although in size and coloration it agrees perfectly with the descriptions of 

 S. pmillus.* 



Tiio next synonym of the Brazilian Squirrel (var. (Bstuans) is the 8. gil- 

 vii;ularis (Nattcrer, MS.), a species first described by Wagner in 1843, based 

 on specimens from the mouth of the Rio Madeira, having the chin and throat 

 ochre-ycUow. Tiiis form he regarded ns the northern representative of the 

 S. asluans of Southern Brazil. In 18G3, Peters gave the varietal name 

 giiianensis to specimens from British Guiana, also immature, though much 

 larger than the S. pusillus of Gcoffroy. Two of the numerous nominal species 

 <loscribe(l by Dr. Gray, namely, 8. Jlaviventer and S. kuhl'd from "Brazil", 

 arc also undoubtedly referable to var. asluans, as is also his M. leucogaster 

 from Eastern Bolivia. 



The first name applicable to the northern form of Sciurus asluans seems 

 to be the rufoniger of Pucheran, given in 1845 to specimens from Santa Fc do 

 Bogoti'i. In the same article, the name chrysurus was given to other speci- 

 mens from the same locality. The first name was applied to examples having 

 the middle of tlie body dark, the sides reddish, the chin and throat gray, and 

 the tail ringed with red and black; the second to specimens with the dorsal 

 surface uniformly colored, the throat yellow, and the tail washed with golden. 

 To the extreme phase of this species, as developed in Costa Rica, Peters, in 

 1864, applied the varietal name hojfmanni (Sciurus lesluans var. hoffmanni), 

 in which the size is rather larger and the colors stronger, especially the rufous, 

 than in the New Granada specimens. Gray's Sciurus hyporrhodus, described 

 in 1867, was based also on specimens from Santa Fd de Bogotd, apparently in 

 full winter pelage, which are unquestionably referable to the form previously 

 named by Pucheran. His description applies in every detail to numerous 

 specimens before me from Costa Rica. Gray's Macroxus irroratm, from the 

 Upper Ucayali, Eastern Peru, also belongs here, showing that this rufous 

 form of Sciurus asluans ranges quite far southward along the eastern base 

 of the Andes. I also refer to this form the same author's M. griseogena from 

 Mexico, Honduras, Costa Rica, Panama, and Santa Fd de Bogotd. 



Geoobapiiical distbiuution. — Sciurus asluans, including its two varie- 



* Bufruii's (IcBcriptiiin of Le Petit Guerlinguct would lead one to sappose it to liavo been baaed ou an 

 odiilt individual. Ho nays .... " los testiculcs de ce petit gaorlingnet <StoioDt beaacoap plna grog 'que 

 ceiLt dii grand gncrliugnut, & proportion du corps, qnoiqiie ce» partes prdsent dans le grand gnerlinguet 

 de 111 nifliuo groaseiir qne dons nos 6cureniU."— (/Tijl. Kat. Siippl. torn, vii, p. 204.) It seems curtain tbat a 

 spccios uf Sipiirrcl so runiarkublo as this could not su long remain unknown in a region whoso zoology 

 is now so well known as tbat of Cayenne and Eastern Uiazil. 



i!ir^ii 



i: iS^.ti 



