BIONOMICS AND DEVELOPMENT OF LYGOCERUS sp. 111 
TExtT-FIG. 7. 
Larva of the fourth instar, showing tracheal system. x 49. 7. st.= 
rudimentary stigmatic trunks of segments 9 and 10. 
TEXT-FIG. 8. 
The mandibles of the full-grown larva, x 400. 
TEXT-FIG. 9. 
Diagram of the general structure of the fourth stage larva, a.=anus. 
cd.=cauda, g.—gonad. dc, 0,=imaginal disk of ovipositor. 
1. m.=longitudinal muscles, M. t.=Malpighian tube. mes.= 
mesenteron. m.—mouth. 2. c.=nerve cord. oes.=oesophagus. 
gl. s.=salivary gland. sp. gn.=supra-oesophageal ganglion, 
