50 
ICTERUS ICTEROCEPIIALCS. 
existing between the sexes of the red-winged troop"’ ( 
The hill and feet are proportionally smaller than the* 
of the male, the feet being blackish ; the irides 
dark brown. The general colour is uniform dark brow. 
a shade lighter on the margin of each feather. I** 1 
.. . ■ • r f • 11 
line of*' 
frontlet is grayish ferruginous, as well as a ..... - , 
the eye, confluent on the auricles, with a broad line ( 
the same colour passing beneath the eye, includiu? 
blackish space varied with grayish. An abbrevia* 
blackish line proceeds from each side of the lo" 
mandible; the chin and throat are whitish; on 1 
breast is a large rounded patch, of a pretty vivid yelk, 
occupying nearly all its surface, and extending a hr 
on the neck. On the lower part of the breast, 
beginning of the belly, the feathers are skirted 
-nrliJ+n Tim rm nf tho wiiiirs mu! tail is tllfl SafllC 
white. the form of the wings and tail is the sam« 
in the male ; the wings are immaculate. 
The young of this species are very similar to 
female; the young male gradually changing to the r, ‘ 
adult covering. _ m 
The yellow-headed troopials assemble in dense 
which, in ail their varied movements and evoluth 1 
present appearances similar to those of the red-win-; 
which have been so well described by Wilson. T''j 
are much on the ground, like the cow troopial, 
hunting of Wilson ;) on dissection, their stomachs 1"! 
been found tilled with fragments of small insects, "k 
to constitute their chief food, though doubt*' 
they also feed on vegetable suhstai 
Their n«’ 
resemble those of the red-winged troopial, but are Or 
musical. The range of the yellow-headed troop' 11 , 
very extensive, as it is found from Cayenne to , 
river Missouri; although it passes tar north in *, 
western region, yet it does not visit the settled p^ 
of the United States. 
We adopt the genus Icterus, nearly as it was e> 
blished by Brisson, and accepted by Daudin and 
minck. Authors have variously estimated this g e JL 
both in regard to its denomination and limits. , 
of Wilson’s most important nomenclatural 
