12 Synopsis of the Birds 
§§ Anterior toes united to the first joint or beyond, 
7. Syndactyli. Bill straight, entire. 
S. Serrate Bill exceedingly large, curved, serrate. 
TRIBE II AMBULATORES. Toes three before, one behind, 
§ Feet gressorial. 
9. DENTXROSTRES. Bill cultrate : tibise feathered. 
10. ANGULIROSTRES. Bill subquadrangular, acuminate : tibiae 
half naked. 
§§ Feet ambulatory. 
11. GREGARII. Bill robust, conic-acuminate, or cultrate, 
forming a sinus in the front feathers. 
* Bill conic-acuminate. ** Bill cultrate. 
12. Sericati. Bill short, depressed : gape very wide : wings 
and feet moderate. 
13. ChELIDONES. Bill very short, depressed, slender : gape 
very wide : wings very long : feet remarkably short. 
14. Canori. Bill moderate, more or less subulate : outer 
toe united at base to the middle one. 
* Bill depressed. ** Bill robust, convex, compressed. 
Bill subcultrate. **** Bill subulate. 
15. Tenuirostres. Bill elongated, slender: tongue not 
extensible. * Anerpontes. ** Epopsides. 
16. Anthomyzi. Bill elongated, very slender: tongue 
extensible. 
17. jEgithali. Bill short, hard, conic-subulate : hind toe 
and nail largest. 
18. Passerine Bill short, robust, conic. 
19. Columbine Bill vaulted: nostrils covered by a turgid 
membrane. 
20. Passerigalli. Bill vaulted, no turgid membrane. 
