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



Family IBIDID^;. Ibises. 



Bill, long, rather slender, and decidedly curved downward ; tarsus, 

 always less than five inches long ; toes, four, all on the same level, no 

 comb-like edge on side of middle toe nail; wing, from 8.50 to 13 inches 

 long. 



Wing, less than 10.50 inches long. 



General plumage, dark chestnut; feathers, at base of bill, not 

 white. Plegadis autumnalis. 



Glossy Ibis. 



See No. 77. 



Immature. 



Adult. 



White Ibis. Adult. 



General plumage, white ; primaries, blackish (adult ) . Guara alba. 



White Ibis. 

 See No. 76. 



See No. 76. 



General plumage, brownish or grayish, often more or less mixed 

 r , and white; rump, white (immature). Guara alba. 



General plumage, brownish or grayish, often more or less mixed 

 brown, gray, and white; rump, white (immature). Guara alba. 



White Ibis 

 See No. 76. 



