328 SYLVIADA. 
hazel ; a streak of bright sulphur-yellow passes from the 
base of the upper mandible, behind the nostril, over the 
eye, and over the ear-coverts; the upper part of the ear- 
coverts, the top of the head, neck, smaller wing-coverts, 
back, and upper tail-coverts, olive-green, tinged with sul- 
phur-yellow ; smaller wing-coverts slate-brown, edged with 
yellow ; all the quill-feathers slate-brown ; the primaries 
and secondaries with a narrow outer edge of bright yellow, 
the tertials with a broader edge of yellowish white ; tail- 
feathers slate-brown, with the outer edge yellow, the 
central pair rather shorter than the others; the chin, 
throat, breast, and flanks, delicate sulphur-yellow ; belly, 
and under tail-coverts, clear white ; under surface of wings 
and tail grey; legs, toes, and claws, brown, sometimes 
dark brown. 
The whole length of some specimens, five inches and one 
quarter ; but the average measurement of many specimens 
is rather less. From the carpal jot to the end of the 
longest quill-feather, three inches: the first feather very 
short ; the second feather rather longer than the fifth ; the 
third the longest of the whole; the wings when closed 
reaching over three-fourths of the length of the tail. 
Females do not differ much from males either in size or 
colour. 
Most of our Warblers begin to moult as soon as their 
breeding season is over, and complete their moult before 
they migrate; but Mr. Hoy informs me that the Wood 
Warblers remain in their old plumage and migrate before 
they change their feathers. 
