52 Field Museum of Natural History — Zoology, Vol. IX. 



Family PELECANID^E. Pelicans. 



Bill, hooked at tip, over twelve inches long and having a large pouch 

 attached to the under mandible; lores, bare; toes, four, all connected 

 by webs. 



American White Pelican. 



* GROUP 1. Wing, over 17 inches long 



General plumage, white. 



Pelecanus erythrorhynchos . 

 American White Pelican. 



See No. 34. 



General plumage, not white (coloration very variable according 

 to age and season, but never white). Pelecanus occidentalis. 



Brown Pelican. 

 See No. 35. 



Family FREGATID.^. Man-of-war Birds. 



Frigate Birds. 



Bill, hooked at tip ; lores, feathered ; upper plumage, entirely 

 black ; toes, four, all connected by webs ; tail, forked ; wings, very long. 



* For directions for measurement, see page 21. 



