318 REVIEW OF AMERICAN BIRDS. [PART I. 
Stelgidopteryx fulvigula. 
Stelgidopteryx fulvigula, BAIRD, 0. s. 
Hab. Costa Rica. 
(No. 34,677, %, Costa Rica.) Above smoky brown. Quills and tail 
feathers almost or quite black; rump with the feathers gray, edged with 
whitish, forming a conspicuous contrast to the back. Chin, throat, and 
forepart of breast reddish fulvous; sides under the wings ‘brown, with a 
decided wash of fulvous; axillars and inside of wings smoky brown; rest 
of under parts dull white, with perhaps a tinge of yellowish; crissum pure 
white, in one specimen with a trace of a dusky spot at ends of longer feathers. 
The edges of the feathers of upper parts, especially of the wing coverts and 
secondary quills, are tinged with reddish fulvous, indicating immaturity, as 
does also the absence of the hooks on outer web of first primary. Judging 
from the analogy of other species, these edgings probably disappear entirely 
in full dress. 
(No. 34,677, 4.) Total length, 4.50; wing, 3.60; tail, 2.00, its fork, .12; differ- 
ence of primaries, 1.50; length of bill from forehead, .39, from nostril, .20, 
along gape, .49; gape, .40; tarsus, .38; middle toe and claw, .50, claw alone, 
.16; hind toe and claw, .33, claw alone, .12. 
The very conspicuous light rump will readily distinguish this 
species from all its allies, except wropygialis. It is, however, con- 
siderably smaller than that species and much darker above, especially 
on quills and tail feathers (on both surfaces and including the shafts), 
the light ramp more conspicuous. The fulvous red of throat seems 
to extend further on the breast, the white of the belly to extend 
farther forward, the brown of the sides to be more restricted. The 
under coverts lack the conspicuous dusky band at tips of larger 
feathers. The conspicuous wash of reddish fulvous on the side may 
be from immaturity. 
It is barely possible that this may be the immature state of S. 
uropygialis ; but the differences in size and coloration appear of 
specific value and not dependent on age. 
Smith-|Collec-) Sex Wihea 
sonian| tor’s | and Locality. Gollected Received from Collected by 
No. No. | Age. : 
34,677 .. |O.¢%| Angostura, C. R. June 6, ’64. J.‘Carmiol.; |)" \aieosws 
34,678 5 0.8 s6 - Sf oe Oe eaptete 
34,679 | .. |0.9 “ Aug. 7, 64. 0 | ae 
(34,677.) Type. 
COTYLE, Bort. 
Cotyle, Bors, isis, 1822, 550. (Type “Yirundo riparia, L.) 
_ Bill small; nostrils lateral, overhung by a straight-edged membrane. Tarsus 
about equal to middle toe without claw; feathered at upper end, especially 
a 
