144 BIRDS OF BKITISH GUIANA. 



to the feathers on the middle of the crown, wldch 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 

 axillaries 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 68, tail 33, tarsus 14. 



The male described was collected on the Bonasika River in 1912. 



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

 patch more restricted. Wing 61 mm. The female described was 

 collected on the Makauria River, 



Young. Sooty-brown above, 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. 



West. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



Mange in British Guiana. Ituribisi River, Siipenaam River, 

 Bartica, Kamakabra River, Makauria River, Abary River 

 (^McConneU collection); K-aaai (^Whitely), 



Extralimital Range. North Brazil, Venezuela. 



Habits. Unrecorded in British Guiana. 



442. Placostomus insularis. 

 Tobago Yellow-ckested Plat-bill. 



Platyrhynchus mystaceus (nee Vieill.) Salvin, Ibis, 1885, p. 292 



(Eoraima, 3500 to 6000 ft.) ; Sclater, Cat. B. Brit. Mus. xiv. t». 67, 



1888 (Twek-quay). 

 Platyrhimchus insularis Allen, BuU. Amer. Mus. ii. p. 143, 1889 



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



1912. 



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



