144 BIRDS OF BUrriSH GUIANA. 



to the feathers on the middle of the crown, which forms a con- 

 cealed white patch ; back, rump, upper tail-coverts, tail, upper 

 wing-coverts, and innermost secondaries, pale umber-brown, some 

 of the lesser upper wing-coverts edged with buff, centre of coverts, 

 bastard- wing, primary-coverts, and inner webs of the primary 

 and secondary quills blackish, inner edge of flight-quills buffy- 

 white ; inner webs of tail-feathers dark brown ; sides of the face 

 paler than the crown and showing slightly paler shaft-streaks : 

 lores whitish at the base ; rictal bristles black ; chin and throat 

 white; remainder of the under surface fawn-colour, including the 

 axillarit'S and lesser under wing-coverts; greater series of under 

 wing-coverts and quills below brown, the inner edges of the 

 latter buff; lower aspect of tail also brown. 



Total length 98 mm., exposed culmen 11, width of bill 13, 

 wing G8, tail 33, tarsiis 14. 



The M:ale described was collected on the Bonasika River in 1912. 



Adult female. Similar to the adult male but the white coronal 

 })atcli more restricted. WingGl mm. The female described was 

 collected on the Makauria Kiver. 



Young. Sooty-brown al)ove, including the head, with pale tips 

 to the feathers ; under surface whitish with a tinge of fawn-colour. 

 This bird was collected on the Ituribisi River. 



Breeding-season. Unknown in British Guiana. 



Nest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Range in J3ritish Guiana. Ituribisi River, Supenaam River, 

 Bartica, Kamakabra River, Makauria River, Abary River 

 (^McConnell collection); Auxida (^W hit elg). 



Extralimital Range. North Brazil, Venezuela. 



Habits. Unrecorded in British Guiana. 



442. Placostomus insularis. 

 ToBAQO Yellow-crested Flat-bill. 



Platyrhynclius mystaceus (nee VieiU.) Salvin, Ibis, 1885, p. 292 



(Roraima, 3500 to 6000 ft.) ; Sclater, Cat. B. Brit. Mus. xiv. p. 67, 



1888 (Twek-quay). 

 Platyrhunchus insularis Allen, Bull. Amer. Mus. ii. p. 143, 1S89 



(Tobago) ; Brabounie & Chubb, B. S. Amer. i. p. 270, no. 2750, 



1912. 



Adult male. General colour of the upper surface dusky olive- 



