AVIFAUNA OF LAYSAN, ETC. 



75 



6. CHASIEMPIS GAYI, Wilson, 



ELEPAIO OP OAIIU. 



Chasiempis sandvicensis, Cab. Arch. f. Naturg. 1817, p. 208 (nee Gmel.) (genus Chasiempis established: 

 the specimens here called Ch. sandvicensis were collected by Deppc on Oahu) ; Licht. Nomencl. Av. 

 Mus. Berol. p. 19 (1854). 



Chasiempis sandivichensis, Pclz. Ibis, 1874, p. 462 (Enero, Oahu, 1837, Deppe coll.) ; Berl. & Levcrk. Onus, 

 vi. p. 2, pi. i. fig. 3 (1890) (The authors had before them a Hue scries from the Museum at Kiel, 

 collected by Behn on Oahu. As all their specimens came from Oahu, and, as they compared them with the 

 published descriptions and figures of all the other species, they were induced to unite all the different 

 species from the various islands into one. They were right, on the other hand, in decidedly stating that 

 the sexes were alike and that the white-rumped were the adults of the tawny-rumped birds) ; Rothsch. 

 Bull. B. 0. C. i. 1893, p. lvi, & Ibis, 1893, p. 570 (the name of sandivichensis was by mistake referred to 

 the form from Oahu instead to the one from Hawaii). 

 Chasiempis gayi, Wilson, P. Z. S. 1891, pp. 165, 166 (Oahu). 



Adult male. Above brown, slightly tinged with tawny ochraceous, more distinctly so on the 

 head ; forehead, ear-coverts, and an ill-defined line above the eye ochraceous buff, becoming 

 almost bnffy white on the lores and round the eyes. Plump and upper tail-coverts white, 

 formed by the feathers being blackish grey at the bases and largely tipped w ith white. 

 Quills deep brown, narrowly edged with pale brown on the outer webs and broadly edged 

 with white inwardly. Eectrices blackish brown, largely tipped with white ; this colour 

 occupying both webs at the tips on the outer pair, becoming restricted to the inner webs 

 and less extended to the middle and leaving the central pair without white. Feathers of 

 the chin, throat, and upper breast black, those of the chin and upper breast not or very 

 narrowly, those of the throat broadly edged with white, so that there appears a large white 

 patch on the throat, while the chin and upper breast appear black. Abdomen and under 

 tail-coverts white, the bases of the feathers blackish ; breast and sides of body washed 

 with brown. Upper wing-coverts deep brown, all except the primary-coverts tipped with 

 white. Under wing-coverts mixed blackish and white, the bases being blackish, the tips 

 white; the under wing-coverts often appear almost quite white. Iris hazel; bill 

 blackish ; tarsi slate-blue. 



Young. Above tawny ochraceous brown, bright tawny ochraceous on the rump and upper tail- 

 coverts. Wing-coverts, except the primary- coverts, tipped with bright tawny ochraceous ; 

 secondaries and inner primaries margined with the same colour on the outer webs, while 

 edged with whitish inwardly. Below white, strongly washed with tawny ochraceous on 

 the throat, breast, and sides of body, as well as on the under tail-coverts; while the 

 middle of the abdomen and vent remains more or less pure white. Tail-feathers as in the 



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