THRYOTHORUS. 125 
Thryothorus petenicus. 
Thryothorus petenicus, SAuvin, Pr. Z. 8. May, 1865, 187 (Peten). 
(Mr. Salvin’s type, No. 112.) Bill longer than the head; tail and wings 
about equal. Color above reddish-brown ; more rufous on the rump. Upper 
tail coverts grayish-brown, rather obscurely banded with black. Outer edges 
of primaries marked with grayish and black, of secondaries and whole exposed 
surface of wing with very obsolete, almost inappreciable dusky bars. Under 
parts whitish, nearly pure on throat and middle of belly, tinged with fulvous 
(and with the feathers very slightly tipped with dusky) across the breast ; 
the sides more like the back, but paler. Crissum with broad white and black 
bars; flanks obscurely barred with dusky. A broad line of white, edged 
with black, from bill over eye to nape: those of opposite sides connected by 
a concealed series of black-edged white streaks on the nuchal feathers, which 
form a half collar with more distinctly marked feathers on the side of neck 
behind the ear coverts, which are like the back. Lower part of cheek feathers 
white, edged with dusky. Tail feathers black; the outer webs and tips 
spotted or blotched with dirty white; the middle feathers ashy-brown, with 
spotted broken bars of black, about one-third their interspaces. Rump with 
concealed spots of white. Bill longer than the head. ; 
(Type.) Total length, 5.30; wing, 2.25; tail, 2.25; graduation, .26; ex- 
posed portion of Ist primary, .90, of 2d, 1.40, of longest (measured from 
exposed base of Ist primary), 1.70; length of bill from forehead, .85, from 
nostril, .55, along gape, .92; tarsus, .86; middle toe and claw, .80; claw 
alone, .23; hind toe and claw, .65; claw alone, .27. 
This species is very similar in coloration and general appearance 
to the typical styles of Z. bewickit, from the eastern United States. 
The bill, however, is much larger and longer, the legs much stouter, 
and the wings and tail about equal, instead of the latter being longer. 
In these points it agrees more nearly with 7. ludovicianus, as well 
as in the character of the nostrils. The white spots of the nape are, 
however, wanting in bewickii, in which also the wing is more dis- 
tinctly barred ; the bands on the upper surface of the tail twice as 
numerous; the white markings quite similar; the crissal bars nar- 
rower and less prominent. ; 
This species appears closely related to T’hryothorus albinucha, of 
Cabot, and murinus, of Hartlaub, though differing in some respects 
from their descriptions. It is quite possible that the two latter may 
prove to be the same species, even if different from petenicus. All 
seem to agree with 7. bewickit in the black tail feathers, varied a 
little with white. 
For the opportunity of examining this species I am indebted to 
Mr. Salvin, who kindly transmitted his unique type for the purpose. 
(No. 112, Sakleek River, near Peten, Guatemala, April, 1862.) 
