248 DR. H. GADOW ON THE [Mar. 15, 



Schizognathous. Schizorhinal. Nares impervious. 

 Rhamphotheca simple. 



Hypotarsus with one canal. Procoracoid process large. 

 Flexors of type I. or IV. Crop globular. 



I. Pterocles. 



African and Asiatic. Nidifugous. 

 Flexors of type IV. Hallux rudimentary. 

 Syringeal muscles broncho-tracheal. 

 Sterno-tracheal muscles separate. 

 Cseca large. 

 15 or 16 cervical vertebrse. 



II. COLUMB^. 



Cosmopolitan. Nidicolous. 



No downs in adults. 



Flexors of type I. Hallux functional. 



Syringeal muscles tracheal only. 



Both sterno-tracheal muscles united asymmetrically. 



Caeca not functional. 



14 or 15 cervical vertebrae. 



1. Bididce. 



Wings and furcula reduced. 

 Flightless. 



2. Columhidce. 



Wings and furcula fully developed. 



18. CUCULIFOEMES. 



Cosmopolitan. Nidicolous. 

 Neck with lateral apteria. 10 primaries. 

 Desmognathous. No basipterygoid processes. 

 Holorhinal. Nares impervious. Rhamphotheca simple. 

 Sternum with small notches or fenestrse. 

 Procoracoid process large. 

 13, 14, or 15 cervical vertebrae. 

 Humerus with ectepicondylar process. 

 Feet zygodactylous, scansorial. 

 Flexors of type I. Hypotarsus complex. 

 Intestinal convolutions of type IV. or V., with telogyrous 

 tendencies. 



I. Coccyges. 



Nestlings naked. 



Downs of adults restricted to the apteria. 



Quinto-oubital. 



Procoracoid approaching, or fusing with, acrocoracoid, 



forming a foramen. 

 Syrinx bronchial. 

 Intestinal convolutions of type V. 



