(',72 MONOGRAPHS OP NORTE AMERICAN BODENTIA. 



D. Middle of the dorsal region dusky or black ; rest of dorsal surface varied with dusky and 

 yellowish-rufous; beneath dark reddish-brow u, varying to fiery-orange ; length about 

 0.50 inches; tail full and bushy, rather longer than head and body. Haft.— Southern 

 portion of Central America and the northern portion of South America.. S. gerkaiiim. 



10. .Size rather small ; length about f.llll to '.'.nil inches; above dark olivaceous-brown, minutely 



varied with yellowish or rufous; beneath fulvous or rufous; tail rather narrow, occa- 

 sionally decidedly cylindrical low aid the end. Hod.— -Brazil, Northern South America, 

 and Central America. Kims into two well-marked subspecies S. 2ESTUANS. 



a. Length about 8.00 inches; tail edged with pale yellowish; smaller and less rufous than 



the next. Hah.— Brazil and Guiana var. astuans. 



b. Length about 9.00 inches; tail edged with red, varying in tint from light, yellowish- 



red to dark cherry-red; general color above rather more rufous than in var. 

 a-stuaiis; also rather redder below. Hab. — Northern South America and Central 



America var. rufcmiijer. 



III. Tail vertebra) alone equal to the length of the head and body ; tail with the hairs one-seventh to 

 one- fourth longer ; size large; premolars 4 '• 



A. Tail full, bushy : 



11. Above dark pure-gray ; beneath white ; tail black, washed with white. Hab. — Pacific 



coast from the Columbia River southward to San Diego, Lower California; not east of 

 the Coast Ranges S. fossor. 



12. Above clear gray, except the middle of the dorsal region, where the color is mixed yellowish- 



brown and black ; beneath generally white, varying at some localities to yellowish- 

 fulvous or rufous. Ilab. — Mexico S. coli.i.ei. 



13. Above black, varied with ochre-yellow and rufous; beneath white, fulvons- or brownish- 



red ; tail black at base and centrally below, edged broadly with red or yellowish-red, 

 appearing mainly of this color at the surface ; pelage short and sparse, especially below. 

 Hab. — Western Brazil, and thence westward to the eastern base of the Andes, and from 

 Bo.ivia northward to New Grenada S. variabilis. 



B. Tail narrow ; pelage coarse and rigid : 



14. Color variable, running into both albinistic and melanistic phases ; generally more or less 



black above, varied with fulvous aud red beneath. Ha b.— Southern Mexico and Central 

 America S. hypopyrrhis. 



I. — Species inhabit iv g North America north of Mexico. 



SCIURUS HUDSONIUS Pallas. 



Chickaree. 



Var. HTJDSONIUS. 

 Eastern Chickaree. 



Sciurus vulgaris Forster, Phil. Trans lxii, 1772, 378. 



Sciurus vulgaris, e, hudsonicus Erxleben, Syst. Auim. 1777, 41(5. 



Sciurus hudsonius P.m. [.as, Nov. Spec. Glir. 1778, 376. — Gmelin, Syst. Nat. i, 1788, 147. — Schreber, 

 S.iugeth. iv, 1792, 777, pi. cexiv.— Shaw, Gen. Zeol. ii, 1801, 140.— Kuhl, Beitrage zur Zool. 

 1-20, 60.— Desmarest, Mammal, ii, 1822, 340.— Sabine, Franklin's Narr. 1823, 663.— Hap- 

 lan, Faun. Araer. 1825, 185.— Godman, Am. Nat. Hist, ii, 1826, 138.— Richardson, Fauna 

 Boreali-Amcr. i, 1829, 187, pi. xvii.— Fischer, Synop. Mam. 1829, 349.— Gapper, Zool. Jour, 

 v, 1830, 205.—" F. Cuvieii, Suppl. Buff. Hist. Nat. i, Mam. 1831, 303."— Bachman, Proc. Zool. 

 Soc.Lond. vi, 1838, 100; Charlesworth's Mag. N. H. iii, 1839, 383.— Thompson, Nat. Hist. 

 Vermont, 1842, 46; App. 1853,14 (albino).— DeKay, New York Zool. i, 1-42, 61, pi. xvii, tig. 2.— 

 Wagner, Suppl. Schreber's Sauget. iii, 1843, 178. — ScniNZ, Synop. Mam. ii, 1845, 12 — Au- 

 DUBON >i Ba« uman, Quad. N. Am. i, 1849, 125, pi. xiv. — WOODHOUSE, Sitgreaves's Expl. Col- 

 orado and Zufii Rivers, 1-.".::, ,">:i (Indian Territory). — Kennicott, Pat. Off. Rep., Agr., 1856, 

 (ia r >7), 67, pi. vii.— BaIRD, Mam. N. Am. 1857, 260, pi. xlvi, fig. 1.— Thomas, Trans. III. Slate 



