THE BIRDS OF NORTH AMERICA. 87 



ORDER XIII.— PSITTACI (PARROTS, PAROQUETS, 



ETC.). 



Toes four, two in front and two behind ; bill with a 

 cere, or covering of skin, at its base. 



Family 39. — Psittacidce. Parrots and Paroquets ; 1 

 species. 



ORDER XIV.— COCCYGES (CUCKOOS AND KING- 

 FISHERS). 



Toes four, two in front and two behind (Cuckoos), or 

 three in front, the middle and outer ones joined for half 

 their length ; bill without a cere. 



Family 40. — Cuculidce. Cuckoos, Anis, etc. ; 7 species. 



Family 41. — Trogonidce. Trogons ; 1 species. 



Family 42. — Alcedinidce. Kingfishers ; 3 species. 



ORDER XV.— PICI (WOODPECKERS). 



Toes four, or, rarely, tliree; two in front; bill strong; 

 tail-feathers usually pointed and stiffened. 



Family 43. — Picidoe. AVoodpeckers ; 24 species. 



ORDER XVI.— MACROCHIRES (GOATSUCKERS, 

 SWIFTS, AND HUMMINGBIRDS). 



Feet very small and weak ; bill short, and mouth large 

 (Goatsuckers and Swifts), or bill long and exceedingly 

 slender (Hummingbirds) ; wings generally long and 

 pointed. 



Family 4i.—Caprimulgidce. Goatsuckers ; 6 species. 

 Family 45. — MicropodidcB. Swifts ; 4 species. 

 Family 46. — Ti-ochilidce. Hummingbirds ; 18 species. 



ORDER XVII.— PASSERES (PERCHING BIRDS). 



Toes four, without webs, all on the same level ; hind 

 toe as long as the middle one ; its nail generally longer 



