FRBDERICKENA. " 



Type F. viridis (Yieill.). 



This genus is named in honour o£ Frederick Arthur, the eldest 

 surviving son of Mrs. McOonnell. 



353. Frederickena viridis. 



Ckested Bush-Shrike. 



ThamnopMlus viridis Vieill. N. Diet. d'Hist. Nat. iii. p. 318, 1816 



(Cayenne); Brabourne & Chubb, B. S. Amer. i. p. 187, no. 1861, 



1912. 

 ThamnopUlus fuliginosus Gould, P. Z. S. 1837, p. 80 (British Guiana) ; 



Selater, Cat. B. Brit. Mus. xv. p. 183, 1890 (Bartica Grove, 



Camacusa). 

 TJiamnophilus lunulatus Salvin, Ibis, 1885, p. 428 (Bartica Grove, 



Camacusa). 



Adult male. General colour above and below dark slate-grey; 

 top ol: head, sides of face, and throat black. 



Total length 200 mm., exposed culmen 23, wing 98, tail 76, 

 tarsus 35. 



The bird described was obtained on the Supenaam River, 1911. 



Adult female. Differs from the adult male in being chestnut- 

 brown above, becoming dark chestnut on the head and sides of 

 face, and the entire under surface blackish barred with white. 



Total length 200 mm., exposed culmen 23, wing 90, tail 63, 

 tarsus 35. 



The bird described was collected on the Ituribisi Eiver, Feb. 

 1907. , 



Young male. Siipilar to adult female, but differs in being darker 

 above, and most of the feathers have indications of blackish cross- 

 bars to the feathers on the back, and mottlings and semicircular 

 crescent-shaped marks at the tips of the inner secondaries. The 

 under surface similar to the female but much darker, especially 

 on the abdomen. 



The nestling. General colour above chocolate-brown with pale 

 edgings to the feathers, which give the appearance of cross-bars on 

 the back and tail ; flight-quills blackish brown on the inner webs ; 

 under surface buff with dark brown cross-bars, base of feathers 

 whitish. 



Breeding-season. Unknown in British Guiana. 



Nest. Unrecorded in British Guiana. 



Eggs. Undescribed from British Guiana. 



