FEMALE REPRODUCTIVE ORGANS 



49 



to form the common oviduct {c.o.d). The walls ui' the common 

 oviduct are muscular, and when the ovipositor is in a state of 

 rest, retracted into the abtluminal cavity, the oviduct curves 

 forwards and dorsal ly to enter the ovipositor (ovj).) ventral to 

 the rectum (red.). Here it swells slightly to form a sacculus 



icg.- 



Fig. 20. Female reproductive organs in sittl ; the left ovary and the viscera have 

 been removed. The ovipositor (ocp.) is shown retracted, in which state the 

 common oviduct {c.o.d.} is doubled back. 



ac.g. Accessory gland. a.c.v. Accessory copulatory vesicle. or. Ovaiy com- 



posed of about seventy ovarioles, and containing ova in various stages of 

 development. ov.d. Oviduct. retr.m. Retractor muscles of the ovipositor. 

 up. Spemiathecae or vesiculae seminales. 



(fig. 21, sac), which leads into the muscular vagina (vag.). The 

 vagina opens into the ventral side of the ovipositor immediately 

 behind the sub-anal plate. 



The Spermathecae (sp.) or Vescicutae Seminales are three in 

 number, two on the left side and a single one on the right. 

 Each consists of a small black, oviform, chitinous capsule, the 

 lower half of which is surrounded by a follicular investment 

 continuous with the cellular wall of the duct, the whole having 

 the appearance of an acorn with a long stalk. The ducts of the 

 spermathecae are lined by a thin chitinous intima continuous 

 with the chitinous capsule, and they open at the posterior end 

 of the sacculus on the dorsal side. 



i 



H. H.-F. 



