558 BIRD?; OF BRITISH GUIANA. 



Adult female. Differs from the adult male only in being less 

 glossy and smaller in measurements. 



Total length 240 mm., exposed. culmen 35, wing 140, tail 85, 

 tarsus 27. 



The specimens described were both collected on the Mazaruni 

 River. 



Breedinff-season. Unknown in British Guiana. 



Xest. See Quelch, Lloyd, and Beebe, nf infra. 



Eggs. Undescribed from British Guaimi. 



Range in British Guiana. Abary River, Mazaruni Kiver 

 (McConnell collection) ; Bartica ( Whitely). 



Extralimital Range. Venezuela, Ecuador, Pim'u, North-east 

 Brazil. 



Hahits. Mr. J.J. Quelch, who met with this species at the Great 

 Falls Demerara River, writes (Timeliri (2) iv. p. 102) : — " Several 

 ot" the beautiful Red-backed Hangnests {Cassicas a^nis) had been 

 taken at various points along the river, where they frequented 

 the laroe trees in the clearings with dozens of their nests hanoinji 

 from the ends of the branches." 



The following note has been copied from Mr. C A. Lloyd 

 (Timehri (2) xi. p. 5) : — "The Red-hucked Mocking Birtl. Their 

 young are also attacked by the mosquito worm. Mr. Barshall 

 informs me that these birds are frequently made tlie victims of 

 another member of their family, Cassidix o/v/^irora, which deposits 

 its eggs in their nests, and imposes u[)0u them the task of rearing 

 its young.'' 



The note below has been copied from Beebe (Our Search for a 

 Wilderness, p. 137): — "We saw small colonies of Red-backed 

 Cassiques resting in isolated Nora trees out in the water ; a new 

 method of [irutection on the part of these intelagent birds." 



