vou. xt.) MOULTS OF BRITISH PASSERES. 17 
greater wing-coverts nor the primary-coverts or wing-feathers. 
After the moult becomes like the adult, but the upper-parts 
are less olive and browner, though not so reddish as in the 
juvenile, the under-parts vary, as in the adults, both in 
colour and in the presence or absence of streaks on the throat 
and flanks. 
LANCEOLATED WARBLER (L. lanceolata). 
Aputts.—Complete moult in October and November. 
In March and April another complete moult takes place. 
Sexes and winter and summer plumages alike. 
JUVENILE.—Like the adult but with rather darker upper- 
parts and with the chin and throat considerably spotted. 
First Wrinter.—The juvenile body-feathers, lesser and 
median wing-coverts and tail are moulted from September 
to December (occasionally January), but not the greater or 
primary-coverts nor the wing-feathers. After the moult the 
bird becomes like the adult. 
Genus Acrocephalus. 
The adults of the British species of this genus have a 
complete moult beginning in some species as early as June 
and in some extending to as late as November. From 
December or January to March or April there is another 
complete moult in most of the species, but in A. dumetorum 
this moult does not involve all,the wing-coverts nor the wing- 
or tail-feathers, while in A. aqguaticus it seems to be confined 
to the body-feathers. As is so often the case, more specimens 
in moult are required of some of the species in order to 
determine definitely the detail of some of the moults and 
sequences. 
The moult from juvenile to first winter plumage is confined 
to the body-feathers and usually the lesser and sometimes 
the median wing-coverts, but in Blyth’s Reed-Warbler the 
inner greater coverts and the innermost secondaries also 
moult. 
In all the species the sexes are alike. There are usually 
small differences in the summer and winter plumages. The 
juveniles are much like the adults but can always be dis- 
tinguished. ‘First winter birds require very careful comparison 
to distinguish from adults, but there are slight differences 
except in the Aquatic Warbler, which appears to be in- 
distinguishable from the adult in its first winter. 
GREAT REED-WARBLER (Acrocephalus a. arundinaceus). 
Apuuts.—Complete moult from August to November. 
From January to March another complete moult takes place. 
B 
