YELLOW-BILLED COUCAL. 185 



particularly strong on the under surface of the tail. 

 The whole of the under plumage is of a graduated 

 tint of greyish cinereous, commencing with being 

 very light on the chin, and ending with being very 

 dark on the belly and thighs ; the under tail-covers 

 are like the upper, and the feet are black. 



Total length, about 13^ inches ; bill, from the 

 gape, 1 ^ ; wings, 4^ ; tail beyond, 7 ; ditto, from 

 the base, 9 ; tarsus, 1. 



SENEGAL LARK-HEEL. 



Centropus Senegalensis^ ILLIGER. 



PLATE XX. 



Above rufous ; beneath cream-white ; head above, ears, neck, 

 and tail, greenish-black ', tail-covers above brown ; beneath 

 pale testaceous with obscure transverse bands. 



Cuculus Senegalensis, Linn. Auctorum, PL Enl. 332. Polo- 

 philus Senegalensis, Leach in Gen. Zool. 9. 1. 53. Le Coucal 

 Hou-hou, Le VaiU. Ois. d'Af. pi. 219. 



IT appears that this well known bird, of which, how- 

 ever, the only possible figure existing is that of Le 

 Vaillant, extends its range in an eastern direction 

 from Senegal to Abyssinia, where it was observed by 

 Mr. Salt* to be " common in the mountainous dis- 

 tricts, generally found sitting in the thick caper and 

 other thorny bushes, whence it is difficult to drive it ; 

 * Travels in Abyssinia, App. iv. 46. 



