650 DESCRIPTIONS OF PLATKS. 



which proceed from the horny arch, b b, As fig. 11. dd, Last dorsal segraent- 

 E E, Sheath of the penis. F, The penis. Fig. 13, The free penis, from above, 

 more magnified than fig. 12. A A, Reflexed margins of the horny plate. 

 A, As in fig. 14. B, Membranous portion of the penis. E E, Sheaths of the 

 penis, consisting of horn. F. Penis, provided in the middle and on the margin 

 with horny ridges. Fig. 14, Free penis, from beneath. A, A cordifovm horny 

 plate, to which the sheaths are attached. E E, The sheaths of the penis. 

 F, Penis, with the aperture X, which is surrounded by a horny arch, whence a 

 ridge proceeds. 



PI. XXVI. Figs. 1, 2, Sexual organs of Callichroma moschatum. Fig. 1, A, 

 Prepuce, supported by a horny ridge, C, which distends into a horny plate, B, 

 upon the upper surface of the prepuce. D, Penis. E, Vasa deferentia. F, 

 Ridge, by means of which the penis is pushed forwards. G, Last ventral 

 segment. Fig. 2, Free penis, seen from the left side, a, Lower horny tip of 

 the penis, b, Upper ditto, c, Vasa deferentia. Figs. 37, Male organs of 

 Blatta orientalis. Fig. 3, View from above, a, Superior horny plate covering 

 them, b, Left, c, Right, d, Penis. Fig. 4, The same from beneath, c, Right 

 horny plate, t, Left. , Upper, d, Penis. Fig. 5, The superior covering 

 plate, consisting of several horny pieces, and provided with a hooked process. 

 Fig. 6, The right covering plate, composed of two pieces, a and b. Fig. 7, 

 The left covering horny plate., with the penis, a a, Ridges, which enclose the 

 penis between them, b, The upwards bent penis, furnished at the end with a 

 hook. Figs. 8 10, Male organs of Cimbex variabilis. Fig. 8, From below. 

 a a, The external sheaths, each consisting of a lower (a) horny and a superior 

 (a*) membranous portion, b b, The penis, likewise consisting of two valves. 

 Fig. 9, The left half of the sexual apparatus, seen from without. ^ a, Horny 

 basal portion of the sheath, b, Membranous appendage, c c, Halves of the 

 valvular penis. Fig. 10, The same from within, marked similarly, d, Outlet 

 of the vasa deferentia. Figs. 11 13, Male organs of Vespa Germanica. 

 Fig. 11, Seen from beneath, a a, External sheaths, b b, Internal sheaths of 

 the penis, c, Penis. X, Aperture for the vasa deferentia. Fig. 12, Penis, 

 from the side, distended like a spoon, anteriorly, c, with a barb, a, by which 

 it hangs attached during copula. Fig. 13, The same, from above, marked 

 similarly, b, Internal passage of the penis. Figs. 14 17, Male organs of 

 Deilepldla Gala, Fig. 14, Lateral view of the whole apex of the abdomen. 

 a a, Horny ring to which the external sheath is affixed. &, External sheath 

 of the left side, with the hooked appendage (5*). c, Penis, d, Horny process, 

 into which the colon passes, e, Anus. Fig. 15, Sheath of the right side 

 seen from within. Fig. 16, Free penis, a, with the aperture c, and the 

 muscles b 6, which attach it. Fig. 17, Anterior aperture of the penis, seen from 

 above. Figs. 18, 19, Male organs of Cercopis vulnerata, 111. Fig. 18, The 

 sexual apparatus, enclosed in valves, seen from the left side. Fig. 19, The 



