9. PETEOCHELIDON. 199 



with rufous white, the fore neck and chest also largely spotted with 

 black ; remainder of under surface pale fawn-colour, paler in the 

 centre of the breast ; under tail-coverts fawn-colour, the long ones 

 black, edged and tipped with fawn-colour. 



Dr. Exton has very kindly presented the Museum with a very 

 young bird of the present species, and from this specimen it appears 

 that the young has a broad black band across the lower throat. 

 This at first appears strange, as the immature plumage is rather 

 handsomer than the adult ; but as this black throat-band is accom- 

 panied by the usual pale margins on the secondaries which distin- 

 guish a young Swallow, there can be little reason for doubting that 

 the black-throated birds are the young of P. spilodera. 



Hah. Eastern parts of Cape Colony, extending into the Transvaal. 



a. S; b,c. 2ad.sk. Eland's Post. (T. C. Shai-pe Collection. 



Atmore). 



d. (S ad. ; e. Juv. sk. Bloemfontein, Oct. 28, Dr. Exton fP.I. 



1876. 



/. Ad. sk. Bloemfontein, Oct. 28, Dr. Exton [P.]. 



ff. Ad. sk. Transvaal {Ayres). Sharps Collection. 



h. Ad. St. South Afiica. Earl of Derby [P.]. 



8. Petrochelidon ariel. 



Collocalia ariel, Gould, P. Z. S. 1842, p. 132 ; id. B. Austr. ii. pi. 15 



(1848). 

 Hirundo ariel, Gray, Gen. B. i. p. 58 (1845) ; id. Cat. Fissir, Brit. 



Mm. p. 25 (1848) ; id. Hand-l. B. i. p. 70, no. 818 (1869). 

 Chelidon ariel, Goidd, B. Austr., hitr. p. xxx (1848) ; Ramsay, Ibis, 



1865, pp. 299, 300. 

 Herse ariel, Bp. Consp. i. pp. 340 (1850). 

 Petrochelidon ariel, Cass. Cat. Hirund. Mus. Philad. Acad. p. 6 



(1853). 

 Lillia ariel, Boie, J.f. O. 1858, p. 364. 

 Lagenoplastes ariel, Goxdd, Handb. B. Austr. i. p. 113 (1865) ; 



Mamsay, Ibis, 1868, p. 275 ; id. Proc. Linn. Soc. N. S. W. ii. p. 179 



(1878) ; Salvad. Oni. Papuasia etc. ii. p. 7 (1881). 

 Chelidon arborea (nee Gould), Ramsay, Ibis, 18Ij5, p. 299 (lapsu cal. ; 



cf. Ramsay, Ibis, 1866, p. 127). 



Adult. General colour above deep blue, the lesser wing-coverts 

 like the back ; remainder of the wing-coverts and quills dusky, with 

 a slight gloss externally ; lower back and rump creamy white, 

 slightly mottled with pale smoky brown where the bases to the 

 feathers show through ; upper tail-coverts duU smoky brown ; taU- 

 feathers dusky brown, glossed on the outer web with blue ; crown 

 of head bright rufous, with very minute blackish shaft-lines ; nape 

 mottled, the feathers being spotted with dark blue and edged with 

 rufous ; lores and a line above the eye black ; sides of face and ear- 

 coverts dull smoky brown ; cheeks and throat white, very minutely 

 spotted with dusky shaft-streaks ; these streaks contiinied on to the 

 fore neck, which is sandy brown like the sides of the body and flanks ; 

 breast and abdomen pure white ; under taU-coverts white, with a 



