II 



Immature. — Similar to the young of A. o. anga, but the bill 

 distinctly thicker. 



Remark. — Specimen.s from Pagan and Agrigan were not exa- 

 mined but seem to belong to this new form. Tiie subspecific name 

 is given in honour of Dr. E. Hartert. 



Aplonis opaca kurodai Momiyama. 

 (Eulabetid<u). 



A. kiltlitzi VViglesworth, Aves Polyn., 1891, p. 44 (part.); Kuroda, " Dobutsugaku 

 Zasshi" ( = Tokio Zool. Mag.), Vol. xxvii, 1915, pp, 330, 332 (part.); Takatsukasa & 

 Kuroda, " Tori," Vol. i. No. 2, (part.); A. kiitlitzi kurodai Momiyama, op. cit.. Vol. ii, No. 

 g, 1920, p. I (part.). 



Adult. — Similar to A. o. anga from Ruk group, but the bill 

 thicker (9- 10.5mm.; that of the latter 8.5— 9.5mm.) and much longer 

 (24-27. 5mm. ; that of the latter 2i.5-25mm.) and the wing also 

 longer in averaL,e (1 i9.5-i3omm. instead of 1i6.5-129.5mm.) It 

 differs from typical opaca by the edge of feathers of both body sides 

 being very distinctly tinged with a bronzy-green lustre, by the bill 

 being longer and thicker (in typical opaca exposed culmen 21.5-24.5 

 mm., depth of bill 9-9.5 mm.). 



Immature. — Similar to the immature of the typical form, but 

 both bides of body somewhat deeper in colour and the edge of fea- 

 thers distinctly tinged with lustrous bronzy-green. It differs from 

 the same stage of A. o. anga, by the under-parts being without 

 pale-yellowish area. 



Young. — Similar to the young of typical bird, but differs from 

 it by the mantle being very faintly tinged with bronzy-green and by 

 the under-parts being somewhat tinged with brown In the same 

 stage of the typical form, the under-parts are much more greyish- 

 ashy in colour. 



