THE GENUS ACRONYCTA AND ITS ALLIES. 245 



broad enough to include them. This is not visible in a direct 

 dorsal view, but is quite distinct on viewing somewhat from 

 one side. It is very distinct on 3, 6, 7, and the anterior half 

 of 10 ; traces of it also exist on the margins and angles of 

 the dark parts of the dark segments, most clearly on 4, 

 where the dark mark is rather narrower, and against the dark 

 hind margin of 11, it is also to be traced as a very narrow 

 line across 10 and 11. On the dark segments, where it is 

 invisible, it appears to be overlaid by the dark area. The 

 trapezoidals and supra-spiracular tubercles have each one 

 dark hair ; those of the other tubercles, the secondary hairs, 

 and also the hairs of 11 are white. The general tint is much 

 dominated by the green intestinal contents. Tridens at this 

 stage is a dark larva with abundant markings, etc. July 30th. — 

 Several have entered the 3rd skin and present an aspect very 

 similar to the ist and 2nd. Head on first moulting is quite 

 white, except jaws pale brown. August ist. — The majority 

 are now in the 3rd skin. In 3rd skin, they are still satisfied 

 to leave one cuticle of the leaf, whilst tridens of the same age 

 eats the whole thickness of a cherry leaf. Each larva likes to 

 get a leaf to itself, and prefers the upper side. Length newly 

 changed, 3^-4 mm. ; full-fed, 6-7 mm. The sides are now pale 

 glassy-green, the dorsum presents a nearly continuous dark 

 (blackish-brown) stripe ; this is the dark marking of the 

 " dark " segments almost unchanged in extent, but darker, 

 and reinforced by dark markings on the pale segments, on 

 these, the dark dorsal band is narrower, not including the 

 posterior trapezoidals as it does on the dark ones. It is inter- 

 rupted across the incision between 2 and 3, on 3 and 4 it 

 includes the dorsal tubercles (conjoined trapezoidals ?), on 6 

 and 7 it is continuous, on 10 it is nearly interrupted behind 

 the anterior trapezoidals, and has a lateral wing passing 

 behind posterior trapezoidal, the colour on this and 11 is paler 

 than elsewhere; on 11 it forms a double patch, one to each 

 anterior trapezoidal with a green line between, and includes 

 also the posterior trapezoidal (as it did from ist skin). 13 and 

 14 are quite transparent and colourless, the white sub-dorsal 

 band now margins the dark dorsal band, i.e., it is nearer the 

 dorsum where the dark band is narrower and is not continuous 

 through 6 and 7, being interrupted by the large green pos- 

 terior trapezoidal tubercles, it is continuous round segment 12, 

 behind the large dark boss of tubercles. 5, 8, g and 12 look 

 larger than the other segments owing to their dark area being 



