9. PETHOCHELIDON. 195 



retrochelidon swainsoni, Sclater, P. Z. S. 1858, p. 296, 1859, p. 376; 



Itaird, Cat Awer. B. p. 40 (1862) ; id. Iteview Amer. B. p. 290 



(1865); Salvin, Ibis, 1866, p. 192; Smnichr. Mem. Bost. Soc. N. 



n. i. p. 547 (1869) ; Scl. Sf Salv. Noinencl. Av. Neotr. p. 14 (1873) ; 



Later. Bull. U.S. Nat. 3Ius. no. 4, p. 17 (1876) ; Salv. ^ Godm. 



Biol. Cent.-Amer., A.ves, i. p. 227 (1883). 

 Hirundo coronata, Licht, Preis- Verz. mex. Vog. p. 2 (1831) ; Cab. J. 



f. 0. 1863, p. 58. 

 Petrochelidon hmifrona (pt.), Coues, B. Color, Vail. p. 426 (1878), 



Adult female. General colour above glossy steel-blue, varied on the 

 mantle and back with ashy-whitish streaks, with which the feathers 

 are edged ; wing-coverts blackish, slightly glossed with steel-bhie ; 

 bastard- wing, primary-coverts, and quiUs also blackish, with scarcely 

 any gloss except on the secondaries, the innermost of which have 

 narrow ashy- whitish margins near the ends of the outer webs ; 

 lower back and riimp pale cinnamon-rufous ; upper tail-coverts 

 brown with narrow blackish shaft-streaks, and edged with ashy 

 whitish ; crown of head glossy steel-blue, separated from the mantle 

 by a narrow collar of deep chestnut extending from the ear-coverts, 

 and followed by a less distinct collar of ashy brown hke the sides of 

 the nBck ; a broad frontal band of deep chestnut ; lores velvety black, 

 with reddish-buff bases ; cheeks, sides of face, and ear-coverts deep 

 chestnut, as also the throat ; a line along the base of the chin black ; 

 in the centre of the throat a patch of blue-black feathers, not very 

 distinct ; sides of neck, breast, and sides of body pale ashy brown 

 with a slight rufous tinge, the flanks with indistinct dusky shaft- 

 Hnes ; centre of body and abdomen white ; thighs ashy brown slightly 

 washed with rufous ; vent pale rufous ; iinder tail-coverts ashy 

 brown tinged with rufous, the feathers subterminally dark brown 

 and broadly edged with whitish ; under wing-coverts and axillaries 

 ashy brown washed with rufous, especially near the edge of the 

 wing ; qi;ills dull ashy brown below. Total length 4'5 inches, culmen 

 0'35, wing 4-15, tail 2, tarsus 0-45. 



Adidt male. Similar in colour to the female. Total length 5*1 

 inches, culmen 0-3, wing 4, tail 2, tarsus 0-45. 



Young. Much duller in colour than the adult, with scarcely any 

 steel-blue gloss, the feathers of the upper surface narrow!)' edged 

 with whitish ; forehead, rump, throat, and sides of face much paler 

 than in the adult and apparently bleached to a sandy-bufF colour 

 before the moult takes place ; the wing-coverts also narrowly 

 margined with whitish, the greater series more distinctly, like the 

 Becondaries. 



Hab. Central America, from Mexico to Guatemala, 



a, b. Ad. sk. Mexico (Dc Saussure). Sclater Collection. 



c. cf ad. sk. Oaxaca, Mexico. M. Sail*? [C,]. 



d. Juv. sk. Costa Eica. R. B. Sharpe, Esq. [P.], 



4. Petrochelidon fulva, 



Ilirundo fulva, Vieill. Ois. Avier. Sept. p. 62, pi. 32 (1807) ; Gray, 

 Cat. Fissir. Brit. Mm. p. 24 (1847) ; Thien.f. J. O. 1857, p. 149 ; 



2 



