322 



The Large Poplar Longhorn 



Entering into the tubular portion of the ovipositor (see below) along 

 with the vagina, are two bundles of tracheae ventrally, and the ali- 

 mentary canal dorsally. 



The ovipositor is made up of several parts — a membranous tube (//), 

 a chitinous hollow sheath (S) and a stout chitinous rod (R). The mem- 

 branous tube (H) bears several ridges on its inner surface, and enters 



Fig. 20. Chitinous plate on uterus and the parts of the ovipositor (greatly magnified). 



Fig. 20 ( 1 ). Chitinous plate at base of uterus. 



Fig. 20 (2). Support in membranous tube of the ovipositor. 



Fig. 20 (3). Dorsal view of membranous tube and sheath (rod portion of ovipositor 

 removed). 



Fig. 20 (4). Ventral view of ovipositor. 



C = support; E = ea,r of sheath; H = membranous tube; pl = plate on uterus; i? = rodof 

 ovipositor; n = ridge on plate of uterus; S = sheath of ovipositor. 



the chitinous sheath (S) at a point about half way down the dorsal surface 

 of the latter. The anterior end of the membranous tube is supported by 

 a shears-shaped structure (C). This structure is made up of two chitinous 

 plates (the handles of the shears) separated by a thin strip of membrane 

 (see Fig. 20, C), and two membranous parts (the blades of the shears) 

 darker coloured at their points on which are situated a few bristles. 



