Phragmaticola Jerdon, Madr. Journ. Lit. Sci., xiii, p. 129 (1845) (ex Blyth MS).
Type, P. aedon (Pall.).
Blyth's name Arundinax for this genus was probably published some months later than Phragmaticola, and the latter must therefore be used. This genus differs from all those of the Sylviidae already dealt with in having the feathers of the forehead rough and disintegrated. In general appearance it is very much like the birds of the genus Acrocephalus but in addition to the difference in the forehead the first primary also differs in being very large.
This Warbler has two moults every year but undergoes no seasonal change of plumage.
The sexes are alike. The bill is short and rather wide with three strong rictal bristles placed diagonally; in front of these are some supplementary hairs and the feathers of the forehead are soft and disintegrated with lengthened shafts. The wing is pointed, the third primary sub-longest and the first very large. The tail-feathers are narrow and much graduated.