52 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



Family PELECANID^. 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 FREGATID7E. 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. 



