THRYOPHILUS. 129 
amount of rusty brown on the sides; the sides of the head and neck 
more streaked with black. These differences are, perhaps, not in- 
compatible with an identity of species, but the Guatemalan bird 
differs from both in some decided characteristics. 
A fine adult Guatemalan specimen, received from Mr. Salvin, has 
the under parts ashy-white, the flanks almost pure ashy. The under 
tail coverts are white, banded sharply with black. In all the more 
southern specimens before me, the under parts are more yellowish- 
white, the flanks conspicuously pale rufous; the white interspaces 
of the black crissal bars more suffused with rusty. The legs of the 
Guatemalan bird appear to be shorter, and the bill lower and smaller. 
The following diagnosis may serve to illustrate these differences. 
In all the specimens the upper parts are bright reddish, or cinnamon 
brown, less vivid towards the head; the wings and exposed surface 
of the tail with black bands, much narrower than their interspaces. 
The upper tail coverts without bands. Beneath white, without any 
bands, except on the crissum, which is broadly marked with black. 
A white line from bill over eye, and a brown one behind narrowly 
margined with black; the sides of the head with the white feathers 
edged with black; a black line from lower edge of lower jaw bor- 
dering the chin :-— 
Var. rufalbus.—Beneath clear white; the sides washed with reddish-brown ; 
black bands on tail about half the width their intervals. 
Var. poliopleura.—Beneath ashy-white; sides ashy without rusty wash ; 
black bands on tail about one-third their intervals. 
As already suggested, the Bogotan bird differs from both the pre- 
ceding, theugh most closely allied to the former. 
(93, rufalbus, Panama.) Total length, 5.80; wing, 2.80; tail, 2.45; length 
of bill from forehead, .86, from nostril, .53, along gape, .97; tarsus, 1.02; 
middle toe and claw, .88. 
(30,656, poliopleura.) Total length, 5.90; wing, 2.70; tail, 2.50; length of 
bill from forehead, .80, from nostril, .48, along gape, .91; tarsus, .93 ; middle 
toe and claw, .80. 
Smith-|Collec-| Sex Wien 
.sonian| tor’s | and Locality. i Received from Collected b 
LN o- No. | age. Mf Collected. y 
poliopleura. 
30,655 | 109 | Juv.| Retaleuleu, Guat. | Sept. 1862. O. Salvin. Salvin & Godm. 
80,656 | 104 Ad. | Savana Grande, ‘‘ 1862, ss oS 
rufalbus. 
a g Panama R. R. arae Cab. Lawrence. M’Lean. & Galb. 
* © ce etme pe ae ON) * Fhe 2 iaitalere = 
es 38,360 | gf | Coteferme. | hee Werreaexs 8/00 Wen cc) eenteta rs 
,092 |31,485 is oe rs 
5 | do | Bogota is aio] aah Laer ata TOWAT. WO WIR. 2: 
9 September, 1864. 
