770 



MOXOORAF'na OF NORTH AMRRICAN RODENTIA. 



il i| 



'! '>' ii 



Itvii 





to S. langsdorffi. of three of the specimens there mentioned. He says fur- 

 thermore that he believed the large Squirrels of Brazil were referable to 

 several species,* which he in this paper attempts to characterize. The dif- 

 ferences he mentions, however, either in size or color, are by no means im- 

 portant, in view of the usual range of variation presented by the American 

 Sciiiri. He restricts, however, the S. langsdorffi to specimens strictly rei'er- 

 ahle to Brandt's original description, or those having the dorsal surface varied 

 with ochre-yellow and black, and the lower parts ochry-rust-yellow, with a 

 small spot of white on the throat; the fore limbs pale yellow, sprinkled witli 

 black; the hind limbs similarly colored, but more reddish; the (ail black at 

 the base, mixed with pale yellow, passing toward the end into orange-red. 

 The nine examples he refers to this species he says are all of the same color, 

 and all come, according to Natterer, from Cuyaba, in the province of Matto 

 Grosso, Brazil. According to his measurements, this species is the smallest 

 of the four he here recognizes. 



The seven specimens he refers to S. igniventris are hL from Marabita- 

 Tias,"on the Upper Rio Negro. Four of them are red, the remaining three 

 black. Two of the red specimens have the hairs of the back black, with 

 light points, which in one are reddish-yellow, in the other grayish-yellow; 

 so that in one the dorsal surface is rust-red sprinkled with black, in tlie other 

 rust-yellow sprinkled with black. The under side of the body is beaufilul 

 rust-red. The tail is black at the base, but mostly red at the surface, with 

 the hairs black basally, somewhat mixed with yellow. The size is given as 

 a little larger than that of S. langsdorffi. This species he says differs from 

 both ,S^. langsdorffi and S. pyrrhonotus through its color and its habitat, an<l 

 from (he former also in size. 



The nine specimens of aS^. pyrrhonotus were (except one) all collected 

 by Natterer near the mouth of the Rio Madeira. The color above is lively 

 rust-red, nclining anteriorly more to orange-re<l and posteriorly l>ecoming 

 fiery-red ; below, whitish-yellow or ochre-yellow, lightest anteriorly. The 

 tail is, as in tiie other species, black at the biise, passing into rust-red or rust- 

 yellow, with the hairs broadly black at the base. The eight 8|>ccimens col- 

 lected by Natterer are said to be all of the same color; the ninth, from Spix's 



* '' S<iit(U-ui buliH icti mill diu )(aiize Siiinnilnng von Natterer vcrijleirlien kujneii iiud bio iloilnrcb 

 mit iliiii 7MV Uol)t>rz» iignng gelaiigt, diMH niirbt ntir iiieine 'A vorbin genanDleo Kxeiuplan^ gar nicht dHiii 

 Sciarut lan<iiii!j)rffii angubureii, Bouderii daati unter den gronen bnailiMbea Eicbborncben mebrrro Arton 

 III iinterHcbuiileo Heyen, wie icb dies nan aiuemandei aetxeii will." — {AUtandl. der math.-ph^ik Claim 

 Bayrr. Aiad. der WimenHh. v, 274.) 



