PLATE XXIII. 



Aphrophora salicis. (Page 83.) 



Fig. 1. — Imago. 



Fig. 1 a. — Under-side of the abdomen of the larva. 



Fig. 1 h. — The larva divested of its concealing froth. 



Fig. 1 c. — The pupa of the same. 



Fig. 2. — Pygofer of the male of Aphrophora alni, 

 with the prehensile hooks, &c., much magnified. 



Fig. 2 a. — The saw of the female with its valves dis- 

 sected out. 



Fig. 2 h. — A mass of spume which has dried into a 

 reticulated ball, within which the skin of the dead 

 pupa is seen. The insect probably has been killed by 

 a parasite. 



Phil^nus lineatus. (Page 87.) 



Fig. 3. — The winged form. The costal edge is often 

 much whiter. 



PniLiENUs campestris. (Page 88.) 



Fig. 4. — The imago. The natural sizes of these 

 insects are indicated. 



