THAMNOMANES. . 25 



the wing only slightly exceeds the length of the tail. Tail graduate 

 and rounded, the six middle feathers longest and subequal. Feet 

 stronger and stouter than in Dysithamnus. The male and female 

 differ in colour of plumage. 



363. Thamnomanes glaucus. 



NOETHEEN CiNEEEOUS PuSH-BIED. 



Thamnomanes glaucUs Cab. Arch, f iir Naturg. 1847, p. 230 (Cayenne) ; 

 id. in Schomb. Eeis. Guian. iii. p. 688, 1848 ; Salvin, Ibis, 1885, 

 p. 424 (Bartica Grove, Camacusa) ; Solater, Cat. B. Brit. Mus. xv. 

 p. 227, 1890 (Mirakka, Camacusa, Bartica .Grove); Brabourne & 

 Chubb, B. S. Amer. i. p. 196, noi 1959, 1912. 



Adult male. General colour above and below dark slate-colour, 

 •with concealed white bases to the feathers on the upper back ; 

 the flight-quills dark brown, with pale edges on the inner webs ; 

 the outermost pair of tail-feathers slightly edged with white ; 

 under wing-coverts grey ; under tail-coverts fringed with pale 

 grey at the tips. 



Total length 130 mm., exposed culmen 16, wing 73, tail 57, 

 tarsus 17. 



The male bird described was collected at Bartica in 1911. 



Adult female. General colour above cinnamon-brown inclining 

 to rufous-brown on the wings and tail, with concealed white bases 

 to the feathers of the upper back' ; inner webs of flight-quills dark 

 brown, edged with pale rufous on, the inner webs ; throat dusky- 

 white ; breast dusky-brown ; abdomen, flanks, under tail-coverts, 

 aud under wing-coverts bright- rufous; 



Total length 138 mm., culmen 18, wing 65, tail 61, tarsus 16. 



The female described was also collected at Bartica in 1911. 



Breeding-season. Unknown in British Guiana. 



Nest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Ituribisi River, Supenaam River, 

 Bartica, Kamakabra River, Makauria River, Berbice River, 

 Anarica River {McComiell collection) ; Bartica and Kamakusa 

 ( Whitely). 



Extralimital Range. Surinam {Fenard), Cayenne {Cahanis), 

 Venezuela, Ecuador, and Peru. 



Habits. Unrecorded in British Guiana. 



