FAMILY PICIDAE 583 



haematogaster, in which the foreneck is wholly black, and the under 

 wing markings are whiter, is found in eastern Colombia from Boy- 

 aca southward through eastern Ecuador to eastern Peru. 



The peculiar signal drum of the three species of Campephilus 

 found in Panama, a single hard blow of the bill followed instantly 

 by a second, appears to be common to others of this genus. In 

 earlier observations in the Chaco of northern Argentina I noted it 

 in Campephilus leucopogon (Wetmore, U.S. Nat. Mus. Bull. 133, 

 1926, p. 215), and it is described by Tanner (Nat. Aud. Soc, Res. 

 Rep. no. 1, 1942, p. 62) in the ivory-billed woodpecker, Campephilus 

 principalis, formerly found through southeastern United States. 



