CHARACTERISTICS OF LARV.E OF ANOPHELIXA. 151 



nients^ the outline of which is quite smooth to the tip. In the 

 young larva in most, but not in all, cases, the palmate hairs 

 are quite transparent, with exceptionally sharp outline ; in the 

 mature larva on the third to seventh segments they are 

 highly pigmented, except in the distal one third, which 

 remains quite clear ; the hairs on the first two abdominal 

 segments and the thorax do not acquire pigment, and owing 

 to this may readily be overlooked in the live larva. In the 

 dead the hairs on the lower segments are commonly expanded, 

 but on the anterior and thorax always collapsed, on which 

 account and by reason of flimsy texture they may not be 

 noticed. We have frequently needed to employ brilliant 

 illumination through the body and relatively high powers for 

 demonstration, but have invariably discovered them. PI. 

 XXIV, fig. I, shows a larva of this species with palmate 

 hairs of the first four and the seventh abdominal segments in 

 action; the different character of the first two is well shown, 

 particularly by the shadow on the surface of the water. The 

 plate has been accidentally scratched, and an appearance as 

 of a thin hair arising from the thorax caused, but inspection 

 with a lens shows its nature. 



A very curious feature has been observed in three indi- 

 viduals only, which apjDears to have no specific importance — 

 a large delicate dendriform hair on the first abdominal seg- 

 ment (PL XXII, fig. /). This overlies the palmate on a 

 higher plane, with origin nearer the middle line (the palmate 

 hair is shown on one side only of PI. XXII) ; the branches 

 are quite transparent, and in examination of a living larva, if 

 the palmate came at once into focus, might probably be 

 missed. It was first observed in one larva of a small batch, 

 but not in other six gathered at the same time. The collec- 

 tion of preserved larvte was then examined minutely, and 

 this feature found in one only. More were collected from 

 the pool from which the latter had been taken, but of thirty 

 the dendriform hair was observed in one only, and in ten 

 gathered from another source in none. Imagines were ob- 

 tained from the two ; both were males but no differences 



