July 3] BANGS — ROUGH-WINGED SWALLOWS 59 
gor 
Characters.— Differs from S. rujficollis ruficollis in pale ashy rump, in marked 
contrast to back, and in paler breast and sides, which have a yellowish gloss. 
Head and back sepia, darkest on top of head; rump pale drab-gray, almost 
whitish in some examples and in marked contrast to rest of back; primaries 
and rectrices clove-brown; tertials, in fresh plumage, edged with drab; 
throat pale orange buff; breast and sides pale hair-brown, much lighter than 
color of back, with a yellowish gloss; belly and under tail coverts naples 
yellow, the under tail coverts paler than the belly; longest under tail coverts 
with large subterminal clove-brown marks across the feathers. 
Stelgidopteryx ruficollis uropygialis (Lawr.). 
Cotyle uropygialis Lawr., Ibis, 1863, p. 181. 
Type locality.— Isthmus of Panama. 
Geographic distribution.— Panama, Chiriqui and Costa Rica. Probably 
intergrading with S. rujicollis equalis just south of the Isthmus. 
Characters.— Similar to S. rujficollis equalis, except in being darker on 
breast and sides, and in having the belly and under tail coverts yellowish 
white, usually but not always with a tinge of yellow in middle of belly. 
Head and back sepia, head darker; rump pale drab gray, in marked con- 
trast to color of back; primaries and rectrices clove-brown; tertials edged 
with drab; throat rich orange buff; breast and sides hair-brown (without 
yellowish gloss); belly and under tail coverts yellowish white, middle of belly 
sometimes slightly more yellowish; longer under tail coverts with large sub- 
terminal clove-brown marks across the feathers. 
Stelgidopteryx ruficollis fulvipennis (Scl.). 
Cotyle fulvipennis Scl., P. Z. S., 1859, p. 364. (Based on a young specimen.) 
Stelgidopteryx fulvipennis Baird, Review Amer. Birds, 1865, p. 316. 
Type locality.— Jalapa, Mexico. 
Geographic distribution.— Southern Mexico and Guatemala. Intergrading 
gradually with S. raficollis uropygialis in Central America. 
Characters.— Differs from S. ruficollis uropygialis in paler brown back, the 
head not noticeably darker and the rump scarcely paler than rest of upper 
parts; in the tertials being more narrowly edged with drab; in the throat 
being grayish, faintly suffused with orange buff; and in the under tail coverts 
and middle of belly being pure white; the longer under tail coverts with 
dusky shafts, and occasionally with dusky subterminal markings, though often 
immaculate. 
