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 ruficollis, the South 

 American representative, are given below.* 



' Stelgidopteryx ruficollis. 



Hirundo ruficollis, Vieill. Nouv. Diet. XIV, 1817, 523.— Ib. Encycl. 



Meth. II, 525 (Brazil).— Co/^e ruficollis, Sclater, P. Z. S. 1860, 



292.— Ib. Catal. 1861, 41, no. 249. 

 Hirundo fiavigastra, Vieill. Nouv. Diet. XIV, 1817, 534. — Ib. Encycl. 



Meth. II, 531 (based on Azara, as below, from Paraguay). — Cotyle 



fiavigastra, Boie, Isis, 1844, 170. — Box. <:onsp. 1850, 312. — Burm. 



Uebers. Ill, 1856, 144. 

 Hirundo hortensis, Light. Verz. Doubl. 1823, 57 (Bahia). — Temm. PI. 



Col. 161, 2. 

 Hirundo jugular is, Maxim. Beit. Ill, 365 (Brazil). 

 Hirundo fiaviventer. Lesson, Traite d'Orn. I, 1831, 269 (Brazil). 

 Golondrina de la vienire amarillazo, Azaka, Apuut. II, 1805, 512. 

 Hah. 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. 



