I ?6 Riker and Chapman, Birds at Santarem, Brazil. [April 



Lacerda, in fresh and unworn plumage. Above grayish brown, the 

 feathers of the head with distinct, those of the back with obscure, 

 darker centres; rump sandy brownish, the feathers without darker 

 centres; wings fuscous-brown, the primaries and outer secondaries with 

 their greater coverts edged with whitish, the inner secondaries and ter- 

 tiaries terminated with whitish and edged with the color of the rump ; 

 lesser coverts with brownish white borders which are whiter terminally; 

 tail somewhat darker than the wings, all but the outer pair of feathers 

 margined externally with grayish brown, the outer feathers externally 

 margined from near their bases with whitish and terminated by a white 

 band which measures on their shafts 1.25 inches and decreases in width on 

 the succeeding feathers until it appears merely as a slight apical tip on 

 the pair next the median feathers on which it is entirely wanting; there 

 are faint blackish moustachial streaks, and a blackish line from the corner 

 of the mouth passes through the eye, includes the upper half of the auri- 

 culars, and is bordered above by a buffy white loral line which widens 

 posteriorly into a broader, slightly whiter postocular stripe; the under- 

 pays are buffy whitish, slightly grayer on the breast, the buffy suffusion 

 growing heavier posteriorly and appearing as fulvous on the crissum ; 

 under wing coverts pale, clear, creamy buff: flanks buffy brown, heavily 

 streaked with blackish; bill black, the maxilla lighter basally ; feet black, 

 the soles yellowish. 



In southeastern Brazil and south to the Argentine Republic, Mimus 

 arenaceus is evidently replaced by modulator of Gould, with which it 

 may intergrade. So far, as my material goes, however, the two birds are 

 distinct. 



From true saturninus, arenaceus maybe distinguished (1) by its larger 

 size, (2) by the browner coloration of the upper surface, the feathers here 

 having less distinct blackish centres, (3) by the presence of a buffy suf- 

 fusion occupying to a greater or less extent all the white areas, and (4) 

 by the yellow instead of plumbeous color of the soles of the feet. 



Although Mr. Allen, in his 'List of Birds collected at Santarem by 

 Charles Linden,' records saturninus as "common," Mr. Riker met with 

 only a single specimen and it was not taken by Mr. Smith. Mr. Lavard, 

 in his list of birds observed at Para, f does not mention it, nor does Dr. 

 Sclater give it in his list of the birds collected by Wallace on the Lower 

 Amazon. % It is apparently not common in collections and I append 

 therefore, a description of Mr. Riker's specimen. 



Mimus saturninus (Licht.). 

 Coll. C. B. Riker, ?, August 11, 18S4, Santarem (Diamantina,) 



tlbis, 1873, p. 374. tP. Z. S., 1867, p. 566. 



