Okdek PASSEEES.] [Fait. HIRUNDINIDJE. 



HYLOCHELIDON NIGEICANS, 



(AUSTRALIAN TREE-SWALLOW.) 



Hirundo nigricans, Yieill. N. Diet. d'Hist. Nat. xiv. p. 523 (1817). 

 Dun-rumped Swallow, Lath. Gen. Hist, of B. vii. p. 309 (1823). 

 Hirundo pyrrhonota, Vig. & Horsf. Tr. Linn. Soc. xv. p. 190 (1826). 

 Rerse nigricans, Less. Compl. Buff. viii. p. 497 (1837). 

 Eerse pyrrhonota, id. torn. cit. p. 497 (1837). 

 Cecropis nigricans, Boie, Isis, 1844, p. 175. 

 Collocalia arborea, Gould, B. of Austr. ii. pi. 14 (c. 1845). 

 Chelidon arborea, id. op. cit. i. Intr. p. xxix (1848). 

 Petrochelidon nigricans, Cab. Mus. Hein. i. p. 47 (1850). 

 Hylochelidon nigricans, Gould, Handb. B. of Austr. i. p. Ill (1865). 



Ad. supra purpurascenti-niger : fronte conspicua ferruginea indistincte nigro maculata : uropygio rufescenti- 

 fulvo, scapis plumarum brunneo indicatis : supracaudalibus brunneis uropygii colore lavatis, scapis 

 eodern modo indicatis : tectricibus alarum minimis dorso concoloribus, majoribus et remigibus brunneis, 

 concoloribus : Cauda brunnea, rectrice extima pogonio interno albo notata : remigum rectricumque 

 scapis supra brunneis, subtus albidis : loris cum regione oculari et parotica nigricantibus : genis et 

 colli lateribus sordide fulvis brunnescente variis : subtus fulvescens, corporis lateribus et subalaribus 

 ferrugineis : gutture lineis longitudinalibus parvissimis, pectore et hypocbondriis lineis angustioribus et 

 longioribus striatis : rostro brunneo : pedibus brunneis : iride nigra. 



Juv. similis adulto, sed supra magis brunnescens : uropygio fulvescenti-albido : subtus albicans, corporis latera- 

 libus vix rufescente tinctis. 



Adult. Forebead cbestnut-brown ; crown of tbe bead, hind neck, the whole of the back, and the small wing- 

 coverts glossy steel-blue ; rump and inferior upper tail-coverts yellowish buff mixed with pale rufous, 

 each feather with a narrow shaft-line of dark brown ; longer upper tail-coverts dark brown with paler 

 edges ; throat, fore part and sides of neck, and all the under surface pale yellowish buff, marked on the 

 throat with numerous touches of brown, stained on the sides of the body, inner lining of wings, and 

 under tail-coverts with chestnut-brown ; quills and tail-feathers dark brown, with paler shafts, greyish 

 on their under surface and slightly glossed above. Irides black ; bill, tarsi, and toes light brown. 

 Total length 5'25 inches; wing, from flexure, 4 - 5 ; tail, to extremity of lateral feathers, 2 - 25 (middle 

 feathers - 4 shorter) ; bill, along the ridge "25, along the edge of lower mandible *5, breadth at the 

 gape "4; tarsus "4; middle toe and claw - 55 ; hind toe and claw '45. 



Young. Plumage of the upper parts duller, the head and back being dark umber-brown with only a slight steel 

 gloss ;. the rump and tail-coverts yellowish brown, with darker shafts; the underparts altogether lighter, 

 the abdomen and under tail-coverts being fulvous white, and the throat more distinctly spotted with 

 brown. 



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