312 



INSECTS INJURIOUS TO THE RASPBERRY. 



when these flies are approached as they rest on the bushes, 

 they have the habit of falling to the ground, and there remain- 

 ing inactive long enough to permit of their being caught ; but 

 with the increasing heat of the day they become much quicker 

 in their movements, and take wing readily when approached. 

 The eggs are buried beneath the skin of the raspberry 

 leaf, near the ribs and veins, and are placed there by means 

 of the saw-like apparatus with which the female is provided. 

 The egg is white and semi-transparent, with a faint yellow 

 tinge, and a smooth, glossy surface, oval in form, and about 

 one-thirtieth of an inch long. The skin covering it is so thin 

 and transparent that the movements of the enclosed larva 

 may be observed a day or two before it is hatched, and the 

 black spots on the sides of the head are distinctly visible ; it 

 escapes through an irregular hole made on one side of the egg. 

 The newly-hatched larva is about one-twelfth of an inch 

 long, with a large, greenish-white head, having a black, eye- 

 like spot on each side; the body nearly white, semi-transparent, 

 and thickly covered with transverse rows of white spines. 

 As it grows older it becomes green, very much the color of 



the leaf on which it is feed- 

 FIG. 324. ing, and on this account it 



would be difficult to dis- 

 cover were it not that it 

 riddles the leaves by eat- 

 ing out all the soft tissues 

 between the coarser veins. 

 When full grown, it meas- 

 ures about three-quarters 

 of an inch in length, is 

 of a dark-green color, its 

 body thickly set with pale- 

 green, branching tubercles. 

 The head is small, pale yel- 

 lowish green, with a dark-brown dot on each side. This 

 larva is usually found on the upper surface of the leaf. In 



