MOLOTHRUS. — CHRYSOMUS. 5G5 



According to Beebe (Our Search for a Wilderness, p. 125), 

 " most of the Cassiques feed usually in flocks, sometimes of great 

 size. In the deep bush of the interior it is the habit of birds of 

 many species to search together for food following a set route, 

 and keeping closely to their time schedule." 



Genus CHRYSOMUS Swains. 



CJnysomus Swainson, Classif. B. ii. p. 274, 1S37. Type C. iciero- 

 cephahis (Linn.). 



Fig. 20o. — Chrysomus icieroceplialiis. 



This genus is distinguished by the peculiar shape of the bill, 

 which is sharply pointed and compressed, and the sides of the lower 

 mandible involute; its wiilth at the base is about equal to half the 

 length of the exposed culmen. The wing is rounded, the second, 

 third, and fourth primaries longest and equal, and the first inter- 

 mediate in length between the fourth and fifth. The tail is 

 slightly rounded at the tip and about three-fourths the length of 

 the wing. The tarsus exceeds the length of the exposed culmen 

 by about one-third. Coloration : male and female different. 



704. Chrysomus icterocephalus. 

 Yellow-headed Marsh-bird. 



OrioJus icteroceplialus Linn. Syst. Nat. i. p. 163, 1766 (Cayana). 

 Chrysomus icterocephalus Cab. in Schomb. Keis. Guain. iii. p. 681, 



1848. 

 AgelcBus icterocephalus Sclater, Cat. B. Brit. Mus. xi. p. 345, 1885 



(Georgetown J. 

 JCanthosomus icterocephaln Lloyd Price, Timehri (2) v. pp. 64, 65, 1891 



(nesting habits ; Quelch, t. c. p. 87 (Georgetown). 

 Agelains icterocephalus Beebe, Our Search tor a Wilderness, p. 351, 



1910; Brabourne & Chubb, B. S. Amer. i. j). 436, no. 4484, 1912. 



Adult male. Crown of head, sides of face, throat, and ut clc all 



