14 BIRDS OF BRITISH GUIANA. 



generally, larvse and ants included. It is a lively bird, constantly 

 on the move, tittering a by no means pleasing cry, made up o£ a 

 succession of harsh and loud sounds, like the other songless birds 

 generally. 



Genus SAKESPHORUS Chubb. 



SaJcespJiorus Chubb, Ann. & Mag. Nat. Hist. (9) ii. 1918, July 1, p. 123. 

 Pro Hypolophus Cabanis & Heine, 1859, nee Miiller & Henle, 1837. 

 Type S. canadensis (Linn.). 



Fig. 9. — SahespTiorus canadensis. 



The chief characters o£ this genus are the long and conspicuous 

 crest, which is black in the male and rufous in the female, the 

 absence of a concealed white dorsal patch, the somewhat small 

 bill, the depth about one third the length of the exposed culmen, 

 the almost square wing, the third, fourth, fifth, sixth, and seventh 

 primaries longest, the second primary about equal to the ninth, 

 the rounded tail — the two middle feathers longest, being about 

 six tenths the length of the wing. 



356. Sakesphorus canadensis. 



Black-chksted Bush-Sheikb. 



Lanius canadensis Linn. Syst. Nat. i. p. 134, 1766 (Cayenne). 

 ThamnopMlus cirrhatus (Gmel.) Cab. in Schomb. Eeis. Gruian. iii. 



p. 687, 1848 ; Sclater, Cat. B. Brit. Mus. xv. p. 202, 1890 



(Quonga). 

 Thamnophilus atricapillus Salvin, Ibis, 1885, p. 423 (British Guiana). 

 ThamnopMlus canadensis Braboume & Chubb, B. S. Amer. i. p. 190, 



no. 1900, 1912. 



Adult male. Head, sides of face, and throat uniform black, 

 upper back smoke-brown, becoming grey on the rump ; upper 



