133 



THE ORDER OF PERCHERS, OR 

 INSESSORES. 



THE remaining portion of this Volume will contain 

 the major part of the different families of the 

 Perchers belonging to Western Africa, commencing 

 with the conic-hilled tribe (Cvnirostres), and pro- 

 ceeding to the tooth-hilled groups forming the tribe 

 of Dentirostres. 



WHITE-BACKED CROW. 



Corvus kuconotus, SWAINS, 

 PLATE V. 



Glossy purplish black ; interscapular collar, and middle of the 

 body, white. 



THE old ornithologists considered that nearly all 

 those Crows which were about the size of that of 

 Britain were mere varieties of that bird; and so 

 little were they regarded, that they were not deemed 

 to be worth separate descriptions. This error, how- 

 ever, has long been dissipated, and it is now found 

 that a considerable number of distinct races, in dif- 

 ferent parts of the world, have thus been passed 



