318 



REVIEW OF AMERICAN BIRDS. 



[part I. 



Stelgidopteiyx fiilvigula. 



Stelgidopteri/x fulviyulu, Baird, n. s. 

 Hub. Costa Rica. 



(No. 34,077, %, Costa Rica.) Above smoky brown. Qwills 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, % .) Total length, 4.50 ; wing, 3.60 ; tail, 2.00, its fork, .12 ; diflfer- 

 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 la-ojjygialis. 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 rump 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. 

 uroijygialis ; but the differences in size and coloration appear of 

 specific value and not dependent on age. 



Locality. 



Angostura, C. R. 



Wlieu 

 Collected. 



June 6, '64. 

 Aug. 7, "64. 



Received from 



J. Carmiol. 



Collected by 



(34,677.) Type. 



COTYLE, BoiE. 



Cotyle, BoiE, isis, 1822, 550. (Type Hirundo riparin, L.) 



Bill small ; nostrils Lateral, overhung by a straight-edged membrane. Tarsus 

 about equal to middle toe without claw ; feathered at upper end, especially 



