SCIUBID^— SOIURUS ^STUANS. 



757 



Sctunt jilrjjHliWa Nattkrer, MS.— WaONER, Wiegm. Arob. f. Natnrg. 1813, ii, 43, 1845, i, 148; Abbnnd. 



d. K.-D. Akad. d. Wisaensch. V, 1850, 279 (from near the moath of the Bio Madeira, Urazil). — 



GiEOEL, Siiaget. 1855, 653 (from Wagner). 

 Sc'mnu gufrlingm C*8TELNao, MS. (= Maeruim leucogmler Gray J see Gray, 1. c). 

 Macre nn leueogatter Gray, Ann. and Mog. Nat. Hist. 3d ser. xx, 1867, 430. ^ 



Macri.ru> flavivenUr Castelnah, MS. — Gray, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 432. 

 Macroxut kuhUi Gray, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 433 (= Scmrus leucotU Costoloaa, MS.) 

 ifjioxiu guerlingiu Shaw, Gen. Zoul. ii, 1801, 171, pi. 156. 

 ^riuilian Squirrel, Pennant, Quad. 1771, 286. 



i« O'raiid Oii«Wi»y«««, BuPFON, Hist. Nat. Suppl. vii, 1789,261, pi. Ixv. ', ' ' 



Xf /V(« <J«i«-«i?<7i«rf, BUFRON, Hist. Not. Sappl. vii, 1789, 63, pi. jElvl. _:..■',:■:... i. ■■' 



O'licWiMfuet, SliAW, Gen. ZoCI. ii, 1801, 171. 



CachiH gili, VulifO. r^ /- 



Var. EUFONIQEB. 



Sciurvi nifoii'ger PccnERAN, Rev. de Zool. 1845, 336 (Santa F6 de Bogotit). 

 Sciunu ckrymroa PucnERAN, Rev. de Zool. 1845, 337 (Santa i'6 de Bogota). 



to'iiriM wttuant var. hoffmanni Peters, Monatsb. Akod. Wissensch. Berlin, 1863(1864), 654 (Costa Bica). 

 Scittrut kgporrkodui Gray, Ann. and Hag. Kat. Hist. 3d ser. xx, 1867, 419. 



Matrmaa irroralm Gray, Ann. and Mag. Nat. Hist. 3d ser. xx, 1867, 431 (" Upper ITcayali, Brazil ''). 

 Mttcrozm grmogena Gray, Ann. and Mag. Nat. Hist. 3<1 ser. xx, 1867, 429 (Mexico, Honduras, Costa Bica, 

 Panama, Santa F6 de Bogot£) ; lb. 4th ser. xi, 1873, 469. 



Var. .ESTUANs. 



Vaeietal chars. — Length of head and body 7.00 to 8.00 inches ; of tail- 

 vcrtebroe a Jittle less (about 6.75 to 7.50); to end of hairs about 9.00 to 9.50. 

 Ears of medium size, rounded ; tail narrow, distichous till near the end, where 

 it is more cylindrical. Pelage soft, short. General color above dark olivaceous- 

 brown, minutely varied with fulvous or pale rufous ; below, including inside 

 of the limbs, generally reddish-yellow, varying from pale rufous to yellowish- 

 gray. Sometimes with the yellow restricted to the breast and the middle of 

 the anterior half of the lower surface ; or the whole lower surface is whitish, 

 washed with fulvous. Above, with the middle of the back, sometimes darker 

 tlian the rest of the dorsal surface. Tail yellowish-brown, ringed with black 

 (the subterminal black bar very broad), and washed with pale grayish-yellow. 

 Tlie general color of the tail is blackish, washed with pale whitish-yellow. 

 The outer surface of tlie feet is usually colored like the back. The ears are 

 generally reddish ; the eye is ringed with brownish-yellow. The sides of 

 the muzzle, the chin, and throat are yellowish-white. 



This variety presents no very striking variations in color, and seems to 

 vary but little with locality. I have noticed no tendency to melanism, and no 

 melanistic specimens appear to have been met with by previous authors. 

 The subjoined table of measurements of fifteen specimens, nearly all (thirteen) 

 taken from alcoholic examples, shows only a very moderate range of varia- 

 tion. The specimens arc nearly all from Southern Brazil, and are quite uni- 



