8YLYITDJ2. 347 



confined to portions of the body, and in others again merely to 

 some of the quills of the wings and tail. 



In the Sylviida* the sexes are alike, except in a few genera, in 

 which they differ slightly. The young birds are remarkable for 

 being more highly coloured than the adults, but they have the 

 saint* pattern of colour. It is doubtful if the young birds moult 

 in the first autumn ; but if they do so, the moult has apparently no 

 effect on the colour of the plumage. In those birds which have a 

 complete moult in the spring, the adult plumage is assumed at 

 that season ; but in those the spring moult of which is partial or 

 imperfect, the young do not assume the adult colours till the 

 second autumn. 



The majority of the Warblers are migratory, and the migrations 

 of some are far and wide. Others are quite sedentary and in- 

 capable of any lengthened flight. 



The Sylviidce of India comprise 110 species referable to 32 

 genera. I have Arranged these in two series, the first of which 

 includes all the Warblers with twelve tail-feathers, and the second 

 those with ten. 



Key to the Genera. 



a. Tail of twelve feathers. 



a '. Feathers of the forehead short, rounded, 

 their shafts not elongate ; no hairs or 

 bristles on the margin of the forehead 

 except the ordinary rictal one3 near the 

 gape, 

 a". Rictal bristles arranged in a horizontal 



row. 

 "'. The feathers of the head and neck soft, 



not spinous. 

 a 4 . First primary much less than a third 



of the length of the second. 

 a 5 . Wing longer than tail by nearly 



the length of the tarsus .' AEDON, p. 350. 



U* . Wing and tail about equal in 



length. 



6 . Rictal bristles very small ; tail 

 much graduated, the outer 

 feathers less than three quarters 



the length of tail LOCUSTELLA, p. 351 . 



b 6 . Rictal bristles strong and well- 

 developed ; tail less graduated, 

 the outer feathers more than 

 three quarters the length of 



tail ACBOCEPHALUS, 



6 4 . The first primary longer than a third [p. 355. 



of the second, most frequently equal 

 to or exceeding the halt. 



c 5 . Rictal bristles extrejnely short TRIBURA, p. 3G1. 



d 5 . Rictal bristles well-developed. 

 c. Bill as long as, or longer than, 



the head ORTHOTOMUS, p. 366. 



