9. PETROCHELIDON. 197 



Petrochelidon ruficoUaris, Baird, Hevieio Amer. B. p. 292 (18G5) ; 

 Sali'in ^ Godm. Biol. Centr.-Amer., Aves, i. p. 225 (I880). 



Adult male. General colour above dull purjilish blue, streaked on 

 the mantle and back with greyish-white edges to the feathers ; 

 lower back and rump pale chestnut ; scapulars like the back : wing- 

 coverts and quills brown, with ashy margins to the secondaries ; 

 upper tail-covcrts pale brown, with ashy-whitish edges to the outer 

 ones ; tail-feathers dusky brown, paler brown towards the ends of 

 the inner webs ; crown of head purplish blue, separated from the 

 back by a collar of smoky brown ; base of forehead duU chestnut : 

 ear-coverts and cheeks ashy white, the former posteriorly marked 

 with light chestnut, which extends backwards and forms a patch on 

 the sides of the hinder crown ; throat ashy white ; fore neck and 

 chest pale chestnut, with a patch of smoky brown on the sides of 

 the upper breast ; centre of breast and abdomen white, the flanks 

 and vent washed with pale chestnut ; under tail-coverts pale brown, 

 broadlj- edged with white, producing a mottled appearance; axil- 

 laries and under wing-coverts uniform smoky brown ; quills dusky 

 brown below, more ashy along the edge of the inner web. Total 

 length 4-S inches, culmen 0-35, wing 3"8, tail 1-9, tarsus 0"45. 



Young. Much duller in colour than the adult ; and distinguished 

 by the narrow ashy margins to the feathers of the upper surface, 

 the wing-coverts, secondaries, and tail-feathers being edged with pale 

 chestnut ; lower back and rump paler chestnut than in the adult ; 

 upper tail-coverts edged with rufous ; throat washed with rufous : 

 chestnut band on breast less pronounced ; flanks smoky brown 

 washed vdth pale rufous. Total length 4-6 inches, culmen 0-3, 

 wing 3-45, tail 1-9, tarsus 0'4. 



Mab, Peru. 



a, h. cJjuv. et $ ad.sk. Lima {Nation). Sclater Collection 



c. c? ad. sk. Lima. Prof. Nation [P.]. 



6. Petrochelidon ruflgnla. 



Hirundo rufigula, Bocage, Jorn. Lisb. 1878, pp. 256, 269 ; id. Orn. 

 Angola, p. 545 (1881) ; Sharpe, ed. Bayard's B. S. Afr. p. 840 



(1884), 



Adult male (type of species). General colour above glossy blue- 

 black, the feathers of the hind neck and mantle edged with isabeUine 

 buff or reddish white, producing a streaked appearance ; rump and 

 upper tail-coverts chestnut, contrasting with the back * ; lesser and 

 median wing-coverts dull blue-black ; greater coverts, bastard-wing, 

 and primary-coverts and quills dusky, slightly glossed with blue on 

 the outer web ; tail-feathers dusky with a greenish gloss, all but 

 the two centre ones with a large white spot on the inner web ; 



* An error has crept into my account of this species in my edition of Layard's 

 'Birds ol' South Africa ' {I. c), where the rump is stated not to differ from the 

 back in colour. 



