MICROCERCULUS. 369 



574. Miorocerculus bambla. 

 White-banded When. 



Formicarius hambla Bodd. Tabl. Enl. p. 44, 1783 (Cayenne). 



Microcercitlus lambla Sharpe, Cat. B. Brit. Mus. vi. ,p. 296, 1881 

 (Bai-tica Grove); Salvin, Ibis, 1885, p. 200 (Merum6 Mts., 

 Camascusa) ; Brabourne & Chubb, B. S. Amer. i. p. S39, no. 3469, 

 1912. 



Adult male. General colour above rufoiis-brown, including the 

 head, back, upper tail-coverts, and lesser upper wing-coverts, the 

 feathers marked with black which assumes the form ot' spots, 

 edgings, or bars ; greater upper wing-coverts black, with a sub- 

 terminal band of white ; bastard-wing, primary -coverts, and 

 flight-quills also black, with rather pale edgings to the inner 

 webs ; tail also blackish with traces of obsolete cross-bars ; sides 

 of face rufous-brown ; throat ash-grey becoming darker on the 

 breast and abdomen, and chestnut on the lower flanks, thighs, 

 and under tail-coverts, the whole of the under parts barred with 

 blackish which imparts a more or less waved appearance ; under 

 surface of quills and lower aspect of tail dusky brown. 



Total length 104 mm., exposed cuimen 15, wing 61, tail 25, 

 tarsus 22. 



The specimen described was collected on the Bonasika River in 

 1911. 



Adult female. Difi^ers from the adult male in being greyish 

 white on the throat and the feathers on the breast and abdomen 

 less distinctly marked. It is also rather smaller in measurements. 

 Wing 55 mm. 



The female described was collected on the Quibarroo Creek, 



Immature birds are similar to the adult on the upper surface, 

 with rather bolder markings and pale edgings to the median 

 upper wing-coverts. Under surface paler and more strongly 

 barred. ' 



The immature bird described was collected at Bartica in 1911. 



Another specimen, which I take to be a female, has the throat 

 white and the feathers on the breast and abdomen margined with 

 white. Wing 55 mm. 



This bird 'was collected on the Ituribisi River in February 

 1911. 



Breeding-season. Unknown in British Guiana. 

 VOL. II. 2 B 



