262 Bulletin American Museum of Natural History. [Vol. XXXIV, 
Description. 'Type and cotype (in British Museum) similar in general 
features to G. alphonset alphonsei, but more ochraceous, both above and 
below; but a series of 15 specimens from the immediate vicinity of the type 
locality presents a wide range of variation in the coloration of both the upper 
and lower surfaces of the body. The type is strong buff below while the 
cotype is mostly silvery white below. In other specimens the median area 
of the ventral surface varies from white tinged with pale buff to pale orange. 
In some specirnens the upperparts are as rufous as in typical estwans, in 
others grayish olivaceous, indistinguishable in tone from that of average 
specimens of alphonset. In the more intensely colored specimens the basal 
portion of the hairs of the tail are more strongly ochraceous than in the 
paler specimens, in correlation with the general coloration. But the tail 
appears to be always washed with white as in alphonsei, instead of with 
fulvous as in gilegularis, from which some specimens of the series are other- 
wise indistinguishable. 
Fourteen specimens (11 from Igarape Assi, practically the type locality, 
and 3 from Cameta, lower Rio Tocantins), measured by the collector: total 
length, 338 (325-353) mm.; head and body, 170.5 (163-180); tail vertebree, 
171 (158-177); hind foot, s. u., 42 (40-45). 
Skull (adult female), total length, 44.2; zygomatic breadth, 26; interor- 
bital breadth, 15.6; breadth of braincase, 20; length of nasals, 12; diastema, 
11; maxillary toothrow, 7. 
Specimens examined, 23.— Brazil: Para, 3, type and 2 cotypes (Br. 
‘Mus. 2, Am. Mus. 1); Igarape Assi, 13 (Br. Mus. 11, Field Mus. rae 
Cameta, lower Rio Tocantins, 6 (Br. Mus. 3, Field Mus. 1, Am. Mus. 2). 
Remarks.— G. alphonsei paraensis is closely related to typical alphonsei, 
differing from it slightly and inconstantly in color, and in decidedly smaller 
SIZe. 
In the brief and very inadequate original description of paraensis the 
only comparison made was with the squirrel of the Serra dos Orgaos of 
southern Brazil (near Rio de J aneiro), referred to as “ Sciurus estuans as 
but which was of course the very distinct S. engramt Thomas. 
Guerlinguetus ingrami Thomas. 
Plate IX, Figs. 9, 10; Plate Ps ies, 23. 04. 
Sciurus estuans Wiep (not of Linné), Beitr. Naturg. Brasilien, IT, 1826, p. 431 
(southeastern Brazil)— Burmuister, Thiere Brasiliens, I, 1854, p. 146.— HENSEL, 
Abhandl. Akad. Wissens. Berlin, 1872 (1873), p. 26 (not of Linné), Rio Grande do 
Sul, Brazil— Atten, Mon. N. Amer. Rodentia, 1877, p. 756 (part, only the speci- 
mens from southeastern Brazil); Bull. U. S. Geol. and Georgr. Surv. Territories 
