The genus Herbivocula contains one species which, on account of its thick bill, I consider desirable to separate from the Willow-Warblers. Seebohm places it in his comprehensive genus Lusciniola, which embraces five' of my genera wholly or in part.
Herbivocula is migratory, visiting the southern half of Burma in the winter, and being somewhat rare. It has two moults, but the only difference in plumage at the two seasons is that it is less richly coloured in summer. The young are very yellow. The sexes are alike.
I found this Warbler, on the two occasions I met with it, in bushes. It feeds a good deal on the ground, its strong tarsus being suited to this mode of life. It has considerable affinities for Arundinax in structure and colour, but the tail is nearly square.
In this genus the bill is very stout and deep for a Warbler, and about one third the Length of the head. The three rictal bristles are very strong, and so are the supplementary hairs, which, however, do not extend up to the culmen nor cover the nostrils as in Phyllopneuste. The first primary is very large, and the second falls short of the tip of the wing by a considerable distance, being equal to the eighth.