ON THE DOWN-PLUMAGE AND MOUTH- 

 COLORATION OF NESTLING BIRDS.^ 

 I. 



BY 



C. B. TICEHURST, M.A., M.R.C.S., M.B.O.U. 



ROBIN.f 



Correction. — Outer supra-orbital tract is present as well as 

 inner supra-orbital. 



NIGHTINGALE. Daulias luscinia (L.). 



Down. Colour. — Greyish-black. 



Character. — Long and plentiful on the head ; long on the 

 spinal and scanty on the humeral tracts. 



Distribution. — Inner supra-orbital, occipital, humeral, and 

 spinal, the latter a few tufts in centre only. 



Coloration of Mouth. Inside, orange-yellow ; no tongue- 

 spots ; externally, flanges very pale yellow. 



BLACKCAP. Sylvia atricapilla (L.). 



Down. J Absent. 



Coloration of Mouth. Inside, bright pink ; two long, 



oval, symmetrical brownish spots at base of tongue ; 



externally, flanges whitish. 



BRITISH GOLDEN-CRESTED WREN. Regulus regulus 

 anglorum, Hartert. 



Down. Colour. — Dark grey. 



Character. — Short and scanty. 



Distribution. — -Inner supra-orbital, occipital. 



Coloration of Mouth. Inside, yellow ; no tongue-spots ; 

 externally, flanges whitish. 



* For previous papers and notes on this subject, see Index Vol. III., 

 under " Nestlings." 

 t Cf. Vol. II., p. 189. 

 + Gf. Vol. III., p. 153. 



