OUCULI 276 



again/ divides into two separate tracts, of which the inner 

 is at first two feathers wide, which number is reduced to one 

 just before the termination of the row a little way in front of 

 the cloacal aperture. The outer branch consists of one row 

 only, and terminates some way in front of the end of the inner 

 branch, without, however, showing any signs of being fused 

 with it. PyrrJiocentor, Geococcyx, Crotopliaga, Eudyndmis, 



Fig. 136. — Ptebtlosis of Piaya cayaiui. Ventkal View. 



(AfTES BEDDiBD.) 



Scythrops, and Phoenicophaes have a pterylosis which is much 

 like that of Centropus. The two types of pterylosis observ- 

 . able in the cuckoos are illustrated in the accompanying wood- 

 cuts. Unfortunately the pterylosis of some important genera, 

 such as Coua, is not known. 



All cuckoos possess the ambiens. In all cuckoos we also 

 find the semitendinosus, the accessory semitendinosus, and 



T 2 



