.DENDROPLEX. 125 



increasing on the outermost primary, the shafts of the primary- 

 quills black ; crown of head and hind-neck dark brown with a 

 white, or buffy-white, sagittate mark on the middle of each 

 feather, the short feathers on the forehead and above the eye for 

 the most part white ; lores, sides of face, and ear-coverts greyish 

 white with dark narrow margins to the feathers ; throat yellowish 

 white with dark narrow edo;es to the feathers, the dark edg-ings 

 increasing in width on the fore-neck and upper breast where 

 thay become conspicuous; lower breast, abdomen, sides of the 

 body, and under tail-coverts earth-brown with white shaft- 

 streaks, the latter much less pronounced on the abdomen, sides 

 of body, and under tail-coverts ; under wing-coverts cinnamon- 

 rufous like the basal portion of the quill-lining, the terminal 

 portion of the latter pale brown ; lower aspect of tail dull rufous. 



Total length 195 mm,, exposed culmen 24, wing 95, tail 75, 

 tarsus 20. 



The bird described was collected on the Bonasika River in 

 1912. 



An immature bird, collected on the Ituribisi River in 1909, is 

 darker than the adult both above and below. The head is darker, 

 the feathers shorter, the pale markings on the feathers not so 

 elongated and more buffy-white in colour. Throat and central 

 portion of the feathers below fulvous. The bill also much 

 darker. 



The specimen noted from the Upper Takutu River differs from 

 the other individuals in being much paler in colour both above 

 and below. 



In a series of twelve fully adult specimens I find considerable 

 difference in the measurements of the wing, which vary from 

 i5b mm. to 103. 



Breeding'Season. Unrecorded in British Guiana. 



Nest. In holes of trees (ScJiomburt/k). 



Eggs. Undescribed from British Guiana. 



Range in British Guiana. Upper Takutu Mountains, Upper 

 Takutu River, Ituribisi River, Supenaam River, Bartica, Bonasika 

 River, Abar}' River, Aiiarica River, Ireng River (McConnell 

 coUertion). 



Extraliinital Range. Surinam (Penurd), Eastern and Northern 

 Brazil, Vene/uela. 



Jlahits. According to Schombiirgk (liuis. Guian. iii. p. 690) 



