TACHYCINETA ALBILINEA [Lmcr.). 



CENTEAL-AMERICAN GEEEN SWALLOW. 



Petrochelido)i leucoptera (nee Gm.), Lawr. Ann. Lye. N. Y. vii. p. 317 (]861). 

 Petrochelidon albilinea, Lawr. Ann. Lye. N. Y. viii. p. 2 (1863) ; Salvin, Ibis, 1866, 



p. 192. 

 Pefrochelidon littorea, Salvin, P. Z. S. 18C3, p. 189; Scl. & Salv. P. Z. S. 1864, 



p. 347. 

 mrundo albilinea, Baird, Review Amer. B. p. 300 (1865) ; Scl. & Salv. Xomeucl. 



Av. Neotr. p. 14 (1873) ; Zeledon, Cat. Av. de Costa Pica, p. 5 (1882) ; Salv. & 



Godm. Biol. Centr.-Amer., Aves, i. pi. xv. fig. 1 (1883). 

 Tachycineta albilinea, Lawr. Mem. Bost. See. N. H. ii. p. 271 (1874) ; Salv. & 



Godm. Biol. Ceutr.-Amer., Aves, i. p. 235 (1883) ; Sliarpe, Cat. Birds in Brit. 



Mus. X. pp. 115, 631 (1884). 

 Sirundo albiUneata, Gray, Hand-1. B. i. p. 71, no. 845 (1869). 

 Sirundo leiicopygia, Tacz. P. Z. S. 1880, p. 192 ; id. Orn. Perou, i. p. 240 (1884) ; 



id. op. cit. iii. p. 503 (1886). 



T. supra viridis : uropygio albo : tectricibus alarum majoribus Laud albo marginatis : gcnis totis albis : 

 linea supralorali minore nee trans basin froutis ducta. 



Hub. in America centrali usque ad Peruviam. 



Adult male. General colour above glossy steel-blue, more or less inclining to steel-green, tlic bases to 

 the feathers of the mantle ashy white ; rump white, with hair-like blackish shal't-lincs ; scapulars 

 like the back ; wing-coverts blackish, externally edged with stccl-bluc ; greater coverts, bastard- 

 wing, primary-coverts, and quills blackish, with a slight gloss of dull blue or stccl-grccn ou ihcir 

 outer webs ; upper tail-coverts steel-blue; tail-feathers black with a steel-blue gloss; head like 

 the back ; lores and feathers below the eye velvety black, with a narrow supraloral streak of 

 white ; upper half of ear-coverts and sides of neck glossy stcel-grecn ; lower half of car-covcrts, 

 cheeks, throat, and under surface of body j)urc white ; the long under taii-covcrts Mitli i-ruiaius 

 of blackish longitudinal streaks near their ends; the fore neck, breast, and sides of body rather 

 more ashy than the rest of the under surface and having narrow dusky shaft-lines; ou the sides 

 of the upper breast a small patcJi of steel-green; axillarics and under wing-covcrts asliy wliitish, 

 with hair-likc shaft-lines of dusky brown ; quills below dusky, lighter along the inner welis. 

 Total length 4'8 inches, culmen O'l, wing 39, tail 1'9, tarsus O'l. 



The white margins to the inner secondaries, from which this species derives its name, are either 

 signs of immaturity or winter plumage. Inmost Swallows these white edgings are indications 

 of youth ; but all the specimens as yet cxauiiucd 1)\' us ^liieli pn^scssid this cliaiactrr lia\c liceu 

 also in winter plumage, which iu this species is not dillicult to tell, as the under surface is nnu h 



c) 2 



