STELGIDOPTERYX. 315 
2.25, depth of fork, .15; difference of primaries, 2.28; length of bill from 
forehead, .40, from nostril, 24, along gape, .56, width of gape, .43; tarsus, .45; 
middle toe and claw, .57, claw alone, .19 ; hind toe and claw, .41, claw alone, .16. 
¥ 
The differences between this species and rwjficollis, the South 
American representative, are given below.* 
1 Stelgidopteryx ruficollis. 
Hirundo ruficollis, Vir. Nouv. Diet. XIV, 1817, 523.—In. Encyel. 
Méth. II, 525 (Brazil).—Cotyle ruficollis, Scuarer, P. Z. 8. 1860, 
292.—Is. Catal. 1861, 41, no. 249. 
Hirundo flavigastra, Vieinu. Nouv. Dict. XIV, 1817, 534.—Is. Encycl. 
Méth. II, 531 (based on Azara, as below, from Paraguay ).— Cotyle 
flavigastra, Born, Isis, 1844, 170.—Bon. *Consp. 1850, 342.—Burm. 
Uebers. III, 1856, 144. 
Hirundo hortensis, Licut, Verz. Doubl. 1823, 57 (Bahia).—Trmm. Pl. 
Col. 161, 2. 
Hirundo jugularis, Maxim. Beit. III, 365 (Brazil). 
Hirundo flaviventer, Lesson, Traité d’Orn. I, 1831, 269 (Brazil). 
Golondrina de la vientre amarillazo, Azara, Apunt. II, 1805, 512. 
Hab. La Plata region and Brazil. (Farther north and in the Andes re- 
placed by uropygialis ?) 
(No. 32,742, 9.) Above, with sides of head, smoky brown; darker on the 
head, becoming sensibly paler on rump, especially on the edges of the feathers, 
but still not in any decided contrast with the lower part of back ; the primary 
quills and tail feathers dark dusky brown; the secondaries whitish along 
their outer edges towards the end and at the tip. Chin and throat reddish 
fulvous ; breast and sides of body, with inside of wings, brownish-gray ; the 
median region of body white, tinged with sulphur yellow. Under tail coverts, 
from vent, pure white, with a slight gloss of yellow (less than on belly), the 
longest feathers abruptly tipped with the color of the tail (for nearly half an 
inch), the shafts of some others dusky. Feathers of tibia brown, tipped with 
yellowish-white. 
(No. 32,742.) Total length, 5.50; wing, 4.55; tail, 2.50, depth of fork, .13; 
difference of primaries, 2.10; length of bill from nostril, .21, along gape, .55, 
width, .42; tarsus, .40; middle toe and claw, .52, claw alone, .18; hind toe 
and claw, .32, claw alone, .15. 
The upper parts are colored much as in C. serripennis, rather darker per- 
haps, and the rump rather paler, forming a greater contrast. The whitish 
edging of the secondaries is more decided. Beneath, however, the colors are 
decidedly different. The tail is much longer; the feet and bill smaller. 
Smith- |Collec-| Sex When 
: ; . , ; 
epuian ee Hee Locality. Collected. Received from Collected by 
= Pitt. fas Lone ae | acs ai 
15,000 AS 58 Brazil. U.S. Expl. Exped. i ee 
32,742 |35,370 | ¢ «“ ie Worketawe ahh ieee ne 
“16,344 92] 2 ss July, 1859. | Capt. T. J. Page, Chr. Wood. 
Expl. of Parana. 
