320 



The Large Poplar Longhorn 



For about three-quarters of its length, measured from the apical end, 



the median lobe is split into a dorsal and ventral portion by a membrane 



running along each of its sides from the median orifice (mo) (Fig. 18 d). 



Ensheathing the median lobe at its pointed end is a circular ring of 



Fig. 19. Reproductive organs of female, S. carcharias, about to lay eggs (greatly magnified). 

 The chitinous portions are shown in side view. AG = accessory gland; C = support in 

 membranous tube of ovipositor; _D = dorsal side of ovipositor; E =e&r of ovipositor; 

 •% = e gg; F = terminal filament; H = membranous tube of ovipositor; = terminal 

 chamber of egg tube; Od = oviduct; Ov = egg tube; Pl= chitinous plate on uterus; 

 i? = stout chitinous rod of ovipositor; i?s = receptaculum seminis; S = sheath of ovi- 

 positor; U= uterus; V = vagina; Ve = ventral side of the ovipositor. 



chitin called the tegmen (t). This tegmen shows a basal piece (bp) 

 (Fig. 18 c) to which are attached two lateral lobes (11). These last named 

 portions bear on their apical parts a few stiff bristles. 



Ventrally, the tegmen supports a stout chitinous arch. 



