226 Bulletin American Museum of Natural History. [Vol. XXXIV, 
Mesosciurus griseogena griseogena (Gray). 
Macroxus griseogena Gray, Ann. and Mag. Nat. Hist. (3), XX, p. 429, Dec. 1867 
(here a composite species). 
Slciurus] griseogena THomas, Ann. and Mag. Nat. Hist. (7), VII, p. 193 (in text), 
Feb. 1901 (type locality fixed as ‘“‘Venezuela’’). 
Sciurus griseogena RoBinson and Lyon, Proc. U.S. Nat. Mus., XXIV, No. 1246, 
pp. 144-146, Oct. 3, 1901 (San Julidn, Venez.; description and notes on habits) — 
Oscoop, Field Mus. Nat. Hist., Zodl. Ser., X, No. 4, p. 26, Oct. 20, 1910 (mountains 
near Maracay, Aragua, Venezuela).— Autumn, Bull. Amer. Mus. Nat. Hist., XXX, 
p. 255, Dec. 2, 1911 (Las Quiguas, San Esteban, Guarico, and Paramo de Rosas, 
northwestern Venezuela). | 
Sciurus griseogenys Auston, Proc. Zool. Soc. London, 1878, p. 667, part (the 
Venezuelan references only). 
Sciurus estuans var. rufoniger ALLEN, Mon. N. Amer. Rodentia, H.757, 1877, 
part (the reference to the Venezuela record of Gray’s Macroxus griseogena only. 
Not S. rufoniger of Pucheran 1845, nor of Gray 1842). 
Sciurus hoffmanni AuuEN, Bull. U. 8. Geol. Surv. (Hayden), IV, No. 4, p. 885, 
Dec. 11, 1878, part (the references to Gray’s Macrozxus griseogena only). 
Sciurus estuans var. hoffmannit Tuomas, Proc. Zoél. Soc. London, 1880, p. 401 
(in text), part (S. griseogenys, = Macroxus griseogena Gray, considered to be “a 
very well marked variety” of S. estuans but name griseogenys stated to be antedated 
by hoffmanni Peters). 
Sciurus estuans Atston, Biol. Cent.-Amer., Mammals, p. 182, June, 1880, part 
(the Venezuelan references only). 
Sciurus griseogena klagesi Tuomas, Ann. and Mag. Nat. Hist. (8), XIV, p. 240, 
Sept. 1914 (Galifaré, near Caracas, Venezuela). 
Type locality — “ Venezuela,” by designation of Thomas, 1901 (J. c.). 
Geographic distribution. Northwestern Venezuela. 
Description.— Pelage short and close. Postauricular patches usually 
absent. General tone of upperparts yellowish olivaceous varying (in speci- 
mens from the same locality, sex, and season) to reddish olivaceous, the hairs | 
plumbeous narrowly annulated at the tip with pale yellow and black vary- 
ing (in different specimens) to ochraceous and black ; flanks and outer sur- 
face of shoulders and fore limbs (especially the latter) brighter colored than 
back; ventral surface (in different specimens) pale orange yellow to deep 
reddish orange; chin, nose, and cheeks grayish buff; basal fourth to third 
of tail, both above and below, like the back ; middle half of tail above (more 
or less in different specimens) deep red, varying from orange red to dark 
chestnut red, with little or no black visible; tip of tail deep black without 
red; median line of tail below grizzled rufous and black, the edges red: 
feet usually with a yellowish or ochraceous wash, due to the tipping of the 
hairs with these tints, but sometimes nearly plain dark olivaceous. 
Total length (10 specimens, 6 males, 4 females, from San Julian, collected 
