52 [August, 



breadth of the loaf ; sometimes two or three leaves are thus eaten, 

 more or less, but when its appetite is nearly satisfied, it eats only about 

 three parts aci'oss the truncated top edge, so as to leave a portion 

 uncut on one side, generally about half an inch long ; but previoiis to 

 this the larva has reached its full growth, the length ranging from 15 

 to 17 mm., according to sex, as the largest proved to be female ; the 

 form is cylindrical, and of moderate stoutness, the head rounded, and 

 the three hinder segments slightly tapered, the anal legs extended 

 backward ; the greenish-drab coloured head with dusky dots and hairs, 

 as before, the bright green of the body is deepest on the back as far 

 down as the trachea, which shows faintly through the skin as a paler 

 thread, the belly is of a rather lighter tint of the same green, the sub- 

 dorsal stripes are white, and commence on the second segment, con- 

 tinuing of the same width throughout, though drawing nearer each 

 other as they approach the thirteenth, the outer edge of these is 

 straight, but the inner edge is concave on every segment, so that the 

 green ground of the back appears in a series of broad ovals, with a 

 darker green dorsal line running through them ; the segmental folds 

 greenish-yellow ; the round spiracles are flesh-colour finely edged 

 with blackish ; the warty green glossy tubercles have each on the 

 summit a fine dusky dot bearing a longish rough hair, which when 

 highly magnified proves to be barbed ; all the legs green, the ventral 

 and anal fringed with fine blackish hooks ; the skin of the body is soft 

 and rather velvety. 



As soon as it has done eating at the partly truncated toj) edge of 

 the leaf, as before mentioned, it remains quiet at that place for some 

 hours, for it is there it ultimately pupates after arresting the growth 

 of the leaf, and there, a little below the cut edge, it spins a few silk 

 threads which draw the sides of the leaf a little towards each other 

 and cause an oval-shaped hollow in part lined with silk, wherein the 

 larva lies with either its head near the top edge or else the tail is 

 there, as examples of both postures occur, and one or two threads are 

 passed loosely from side to side over the back of the larva, forming a 

 stay or cincture to secure all in position, and a few more over the 

 binder segments as further security, the uncut portion of the top 

 edge of leaf is drawn down obliquely over the top of the hollow 

 which shelters the occupant and hides a part of it from view, although 

 it is all on the upper surface of the leaf, but the colour of the larva 

 assimilating with that of the grass is no doubt a source of protection, 

 and the same with that of the pupa. 



The pupa is about lOj mm. long with nothing remarkable in its 



