DESCRIPTIONS OF PLATES. 649 



of the same side. Fig. 13, External view of the apparatus of Locusta viridis- 

 sima. a, Upper half, c, Lower half. Fig. 14, The same from within, a, 

 Upper half, e, Lower half, b, Internal valve, indicated here only as a project- 

 ing ridge, Fig. 15, the jointed ovipositor of Chryis (Kirby and Spence). 



PI. XXV. Figs. 1 4, Male organs of Carabus glabratus. Fig. 1, Prepuce 

 from above, as taken from the ventral cavity, a, The horny ridges which dis- 

 tend the bag of the prepuce, b, The process of the prepuce, in which the penis 

 lies, c, Apex of this process, into which the vasa deferentia extends, d, Last 

 dorsal segment. Fig. 2, The same from beneath, a a, The horny ridges of 

 the prepuce, b, The horny plate which lies in the lower portion of the prepuce, 

 c, Process in which the penis lies, d, Last dorsal segment. Fig. 3, Penis from 

 above, with , lateral moveable process, b, in which muscles are inserted. 

 Fig. 4, The same from beneath, a, Aperture of the penis, whence the sperm 

 flows. Figs. 510, Male organs of Dyticus marginalis. Fig. 5, View of them 

 beneath, with the last divided ventral plate. A A, The two halves of the ventral 

 plate. B B, Muscles whereby they are affixed to the preceding one. C C, 

 Horny ridges, which partly serve these for insertion. D D, Muscles which 

 unite the transverse ridge with the ventral plates. a, A horny ring lying 

 beneath in the prepuce, yg, Muscles that move the penis. /, Vasa deferentia. 

 Fig. 6, Penis and prepuce separated from the last ventral plate, seen from 

 beneath, a, A horny ring that distends the prepuce, b, Horny plate which 

 lies in it. i, Membranous portion of the prepuce, d, Sheath of the penis, 

 e, Penis, g g, Muscles which move the penis. /, Vasa deferentia. Fig. 7. 

 The same from above. a a, Horny ring of the prepuce, running at the margin, 







and connected with the penis by muscles, h li. i, Membranous portion of the 

 prepuce, k, Horny plate lying in the upper part of the prepuce. /., Horny 

 scale to which the ends of the horny arch of the prepuce are attached, e, Penis. 

 <7 <JT, Muscles which move the penis, /, Vasa deferentia. Fig. 8, The same 

 seen from the left side, a, Horny ring of the prepuce, b, Horny scale lying 

 in the lower portion. The rest as in the preceding. Fig. 9, The penis, after 

 the removal of the prepuce, a a, Membranous portion of the prepuce, which is 

 drawn back by horny ridges, b, which are connected with the horny ring of the 

 prepuce c c, by means of muscles, at its upper margin, d d, Valves of the 

 penis, e, Penis. Fig. 10, Penis, quite free, a, Ridge which lies in the 

 penis, and closes its aperture. 6, Lower channel, in which the ridge or bone 

 lies. Figs. 11 14, Male : organs of Hydrophilus piceus. Fig. 11, Prepuce 

 from above. M, The removed colon, d d, Last dorsal segment, with three 

 fenestrations. b b, Horny ring which distends the prepuce. E E 5 Sheaths of the 

 penis. F, Penis. j\ Vasa deferentia, surrounded by the membranous portion 

 of the prepuce. Fig. 12, The same, fronv beneath, a, Horny plates, which 

 lie in the lower portion of the prepuce, whence the ridges proceed which affix 

 themselves to the apex of the last ventral plate, e e. re, Other horny ridges, 



u u 2 



