43. MICROCERCULUS. 299 



Adult (Sarayacu, Ecuador; C. Buckley). Geueral colour above dark 

 rufoscent brown, with a few indications of dusky-brown margins on 

 the feathers of the hind neck and head, the latter a little more dusky 

 than the back ; lesser wing-coverts like the back ; median and 

 greater coverts dark brown, narrowly edged with brown like the 

 back; quills blackish brown, externally edged with rufous-brown, 

 the inner secondaries barred externally with black on the outer web ; 

 tail-feathers blackish brown ; lores and ear-coverts dull ashy ; cheeks 

 white, with narrow dusky margins to the feathers ; entire throat 

 and breast pure white ; sides of body earthy brown, with dusky 

 blackish cross bars, more distinct upon the abdomen, which is 

 coloured like the flanks ; sides of the lower breast barred very 

 plainly with dusky brown, the outer webs being wliite, the inner 

 brown ; thighs brown ; under tail-coverts reddish brown, narrowly 

 barred with dusky blackish ; under wing-coverts brown, the greater 

 series dull ashy ; the quills dull ashy brown below, paler along the 

 edge of the inner web. Total length 3-75 inches, culmen 0-75, 

 wing 2-3, tail 0-8, tarsus 0-9. (2Jus. Sahin and Godman.) 



Castelnau's Wren occurs in Upper Amazonia, whence it extends 

 into Ecuador. 



6. Microcerculus marginatus. 



Heterocnemis marginatus, Scluter, P. Z. 8. 1855, p. 145; id. Cat. 



Amer. li. p. 19. 

 Cyphorhinus marginatus, Gray, lland-l. B. i. p. 193, no. 2GG4. 

 Microcerculus marginatus, Sclatcr df Hah. Nomencl. Av. Keotr. p. 6; 



Tacz. P. Z. S. 1874, p. 500 ; Salv. <^- Godm. Biol. Centr.-Amer., 



Aves, i. p. 7G. 



Adult male. General colour above chocolate-brown, darker on 

 the head, which has remains of blackish margins to the feathers, 

 these being nearly obsolete on the remainder of the upper surface ; 

 wing-coverts and quills dark brown, edged with the same colour as 

 the back ; rump and lower back rather more reddish brown than the 

 mantle ; tail-feathers blackish ; lores and ear-coverts dark ashy ; 

 cheeks white, Mith dusky margins to the feathers ; throat and breast 

 white, the former with scarcely any dusky margins, but the latter 

 very distinctly barred with broad edgings to the feathers ; abdomen 

 ashy white, mottled with dusky cross-markings ; sides of breast 

 dark ashy ; sides of body and flanks brown, with scarcely any signs 

 of dusky cross-markings ; under wing-coverts dark ashy brown, 

 washed with clearer brown ; quills dusky below, lighter along the 

 edge of the inner web. Total length 4-4 inches, culmen 0-8, win* 

 2-4, tail 2-2, tarsus 0-9. 



Younij (Pebas, Hauxwell). Similar in colour to the adult, but 

 more distinctly barred on the upper surface, the edges to the feathers 

 being dusky blackish ; at the tips of some of the greater coverts 

 remains of small triangular spots of fulvous brown ; the under 

 surface more distinctly barred than in the adult, the dusky edgings 

 to the feathers being more numerous; the sides of tlic body rather 



