1885.] MR. F, E. BEDDARD ON THE CUCKOOS. 187 



Family CUCULIDiE. 



Subfamily I. Ciiculince. Syrinx tracheo-bronchial ; pterylosis, 

 ventral tract of both sides single. Muscle-formula 

 AXY-I-. 



a. Ventral tract single at its commencemeut. 



Genera Cuculus. 



Chrysococcyx 

 Cacomantis. ( 

 Coccystes (!). | 



Old World. 



b. Ventral tract double at its commencement. 



Genera Saivothera. 



DipIopterus(l.). ^^^, ^^^,^ 



rtaya. 



Coccyzus. 



Subfamily II. Phtenicophaince. Syrinx tracheo-broncliial ; ptery- 

 losis, ventral tract of both sides bifurcate. Muscle- 

 formula A. B X Y + . 



G^^^r^lfynamh. 1 q^ ^orld. 

 rtiosnicophaes. J 



Subfamily III. Centropodina. Syrinx bronchial ; pterylosis, 

 ventral tract of both sides bifurcate ; muscle-formula 

 ABXY-1-. 



a. Ventral tract occupying whole of space between mandibles. 



Genera Pyrrhoeentor. 1 



Centropus. \- Old World. 

 Com (?). J 



b. Ventral tract only occupying median portion of space 



between mandibles. 



Genera Geococcyx. 



Crotophaga. \ New World. 

 Guira. 



