PACHYUHAMPHUS. 273 



527. Pachyrliamplius rufus. 



Cinereous Thick-bill. 



Pipra rufus Boddaert, Tabl. PI. Enl. p. 27, 1783 (Cayenne). 

 Pachyrhamphus oinereus Sclater, Cat. B. Brit. Mus. xiv. p. 341, 1888. 

 Pachythamphus rufus Brabourne & Chubb, B. S. Amer. i. p. 315, 

 Ao. 3221, 1912. 



Adult male. Entire crown of head and nape black; back, 

 scapulars, lesser upper wing-covertSj upper tail-coverts, and 

 tail green more or less tinged with grey; median and upper 

 wing-coverts and secondaries greyish brown with whitish edgings; 

 tail-feathers fringed with white ; sides of the face grey ; bkse 

 of forehead, throat, abdomen, and under tail-coverts white ; 

 breast and sides of body grey with a tinge of sulphur-yellow ; 

 axillaries, under wing-coverts, and inner edges of quills below 

 very pale yellow, apical portion of quills below dark brown ; 

 lower aspect of tail grey with whitish edgings. 



Total length 124 mm., exposed culmen 14, wing 67, tail 47, 

 tarsus 18. 



The specimen described was collected on the Bonasika River in 

 1911. 



Adult female. General colour above and below cinnamon- 

 rufous, durker on the head where it forms a cap ; bastard-wing, 

 primary-coverts, and inner vehs of flight-quills blackish ; under 

 surface of body much paler and inclining to white on the abdomen. 

 Wing 70 mm. 



The female described was also collected on the Bonasika River. 



Immature male. Differs entirely from the adult male and female 

 in having the crown of the head ochreous-brown intermixed with 

 black on the nape and sides of the crown, the back, lesser upper 

 wing-cov^rts, sides of neck, upper tail-coverts, and a band across 

 the breast ochreous-yellow much paler on the last, the tail inclining 

 to cinnamon-rufous, the sides of the face, throat, abdomen, and 

 under tail-coverts white, more or less tinged with yellow, and the 

 bastard-wing, primary-coverts, and flight-quills black, with yellow 

 margins on the outer webs and white edgings to the inner ones of 

 the last. 



The young male from which the description is taken was 

 collected on the Supenaam River in 1910. 



Breeding-season. Unknown in British Guiana. 

 VOL. II. T 



