PLATE XVIII. 



LiBURNiA FLAVEOLA. (Page 62.) 



Fig. 1. — Brachelytrous female, showing its broad 

 vertex. 



Fig. la. — Macropterous male. The natural insects 

 are fulvous-yellow in colour. By mistake the tints of 

 the figures in this plate are too heavy. 



Fig. Ih. — Head, vertex, frons, and antennae of the 

 same. 



LiBURNiA STRAMINEA. (Page 63.) 



Fig. 2. — Brachelytrous female. 



Fig. 2 a. — Pygofer of the male seen from behind, 

 showing the conical cauda within the anal ring. 

 Below this two horny prehensile teeth are attached, 

 and at the base of the opening the ends of the styles 

 appear. The lanceolate summit of the penis appears 

 above and between these styles. 



Fig. 2 h. — The end of the male pygofer seen from 

 below, the parts having been bleached and made 

 transparent by a watery solution of potassic chlorate, 

 mixed with a little hydrochloric acid. The shear- 

 like styles are seen to have, at <j g, extensor and flexor 

 muscles to separate or to keep them together. Between 

 these styles the penis is seen, and on the upper edge of 

 the opening two pad-like organs are attached. They 

 are circularly ciliated on their under sides. 



Fig. 3. — Under side of the head and pronotum of 

 L. mesomela, showing the peculiar form of the brown 

 clypeus and the rostrum. The setae are seen to project 

 beyond the sheath of the proboscis. 



Fig. 4. — Genitalia of L Auhei, same parts as above. 

 The male style is enlarged and drawn at the side. 



