206 | Bulletin American Museum of Natural History. [Vol. XXXIV, 
Guerlinguetus alphonsei alphonset (Thomas). San Lourengo, near Per- 
nambuco, Brazil. Specimens examined, 11. 
Guerlinguetus alphonset paraensis (Goeldi). Para, Brazil. Specimens 
examined, 23. 
Guerlinguetus ingrami (Thomas). Tunnel, southern Minas Geraes, 
Brazil. Specimens examined, 50. 
Key to the Species and ‘Subspecies of Guerlinguetus. 
Size smaller; pelage short and thin. 
Tail washed with rufous. 
Upperparts grizzled ochraceous rufous and black; below rufous or orange 
PNG To Surat dai ny ences Ki sigan eaten Cas Ge» estuans (p. 256) 
Similar to estuans but smaller and paler.......... gilvigularis (p. 257) 
Similar to guvigularis bub paler os rs eS quelchit (p. 259) 
Upperparts more olivaceous, underparts orange buff. .macconnelli (p. 259) 
Tail washed with white. 
Upperparts olivaceous gray; below buff, whitish laterally .alphonsei (p. 261) 
Liperperte mOre oChraceOue. oh. cc ii wa ee ee ee paraensis (p. 261) 
Size larger; pelage long and full. : 
Tat washed wath pale Tubvoue 00. a a ek ee ingrami (p. 262) 
Guerlinguetus estuans estuans (Linné). 
Plate IX, Figs. 4-6; Plate XIII, Figs. 19, 20. 
Sciurus estuans Linni, Syst. Nat., ed. 12, I, 1766, p. 88 (Surinam).— Drsmarest, 
Nouv. Dict. d’Hist. Nat., nouv. éd., X, 1817, p. 109 (= Le grand Guerlinguet, Buffon, 
Hist. Nat., Suppl., VII, 1789, p. 262, pl. lIxv).— Auston, Proc. Zool. Soc. London, 
1878, p. 668, part.— THomas, Ann. and Mag. Nat. Hist. (8), VI, p. 185, Aug. 1910 
(Supinam River, Demerara). 
Sciurus estuans var. estuans ALLEN, Mon. N. Amer. Rodentia, p. 756, Aug. 
1877, part; Bull. U.S. Geol. Surv. Terr. (Hayden), IV, No. 4, p. 885, Dec. 11, 1878, 
part. 
Sciurus estuans var. guianensis Peters, Monatsb. K. P. Akad. Wissen. Berlin, 
1863 (1864), p. 655 (British Guiana). 
Macroxus estuans Gray, Ann. and Mag. Nat. Hist. (3), XX, p. 432, Dec. 1867, 
part. 
Myoxus guerlingugus Suaw, Gen. Zool., II, pt. 1, 1801, p. 171, pl. clvi, 1801 
(= le grand Guerlinguet of Buffon). 
Type locality — Surinam. 
Geographic distribution — The Guianas. 
Description.— Pelage short, soft. Tail vertebrae equal to or shehtly 
longer than head and body. Postauricular patches buffy yellow, restricted 
to a small area close to the posterior base of the ear; usually inconspicuous 
and sometimes absent. Upperparts grizzled ochraceous rufous and black , 
