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



Family CUCULID^. 



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

 ventral tract of both sides single. Muscle-formula 



AXY + . 



a. Ventral tract single at its commencement. 



Genera Cuculus, ^ 



Vacomantis. j 

 Coccystes (?). J 



b. Ventral tract double at its commencement. 



Genera Saurothera. 



Diphpterusil). ^ ^^^, ^^^,^ 



riaya. 



Coccyzus. 



Subfamily II. Phvenicophaince. Syrinx tracheo-bronchial ; ptery- 

 losis, ventral tract of both sides bifurcate. Muscle- 

 formula A B X Y -)- . 



Genera ^«rfyW.. 1 ojj ^orld. 



Subfamily III. Centropodinee. Syrinx bronchial ; pterylosis, 

 ventral tract of both sides bifurcate ; muscle-formula 

 ABXY-f. 



a. Ventral tract occupying whole of space between mandibles. 



Genera Pyrrhocentor. 1 



Centropus. \ Old World. 

 Coua (?). J 



b. Ventral tract only occupying median portion of space 



between mandibles. 



Genera Geococcyx. 

 Crotophaga. 

 Guira. 



• New World. 



