Class 3. Insecta. 



24S 



of the vagina to form the bursa copulatrix, into which the penis 

 of the male is inserted in copulation.* Not infrequently there is at the 

 female aperture, an ovipositor (Locusts), consisting of compli- 

 cated knife-like or dagger-shaped laminae, or a sting (Hymenoptera) , 

 or the last abdominal segments, which then are thin and elongate, and 



Fig-. 206. 



Fig. 207. 



Fig. 206. Female genital organs of the Cockchafer. On the right, the ovarioles 

 are lying together in the natural position ; on the left they are separated, and two are 

 cut away, g vagina, h glands which open into the receptaenla, I oviduct, o segments of 

 the ovarioles containing almost ripe ova, o' regions of the same, containing immature ova, 

 p bursa copulatrix, r anterior, /, r" posterior buds of the ovarian tubules, s glands, 

 sg receptacula ovorum. — Orig. 



Fig. 207. Male genital organs of the same (penis not drawn), b vesicula 

 seminalis, g vas deferens, h glandular appendages, r widened region of the duct of the 

 same, t testis, consisting of six seminal pouches. — Orig. 



may be telescoped, serve in this capacity (Diptera and others). The 

 chorion is often very hard, frequently covered with a delicate and 

 regular sculpturing, and always provided with one or more openings, 

 the micropyles, through which the spermatozoa may enter. 

 The outer form of the eggs varies : it may be spherical, oval, discoid, 

 rough, stalked, etc. 



The male genitalia are for the most part a repetition of those of 

 the female. There is a pair of testes, each consisting of several 

 long seminal tubes or shorter seminal pouches, situated at the 

 end of the vas deferens. The two vasa deferentia unite to form a 



* In the Lepidoptera the bursa copulatrix is peculiar, in that it is not as in other 

 forms, a simple evagination of the vagina, but is a tube, open at both ends, one end 

 leading into the vagina, the other on to the siirface of the body ; so that here the 

 female genital organs have two pores, that into the bursa serving for copulation, 

 whilst the vaginal opening proper allows only of the escape of the eggs. 



E 2 



