TABLE OF THE PLATES. y 



INSECTA. 

 Plate 11. Figs. 11, 12, 13, 15, 17, 18.— Ovipositor of Locusta, 



Fi^j. 11. — Apex of the abdomen of Loclsta" viridissima. A.— Last 

 dorsal segment. B.— Last veutral eegment. C— Ovi- 

 positor. 

 Fig. 12.— One half of the sheath seen from the exterior of Locusta 



EPHIPPIGER. 



Fig. 13. — The same from the inner surface, a. — Superior half of the 

 valve, c— Lower half. 6.— Central, smaller, inner valve 

 of the same side. 



Fig. 14.— SetaB of the ovipositor of a Cicada from the inner side to show 

 the central channel. 



Fig. 15.— External view of the ovipositor of a Locusta. a,_Upper half 

 e. — Lower half. 



Fig. 16.— Apex of the ovipositor of a Cicada from beneath, a a 



Superior distended sheath, with teeth on the margin ' b b 

 —The lower setae pushed upwards, so that they proiect 

 beyond the apex of the sheath. 



Fig. 17.— The ovipositor of a Locusta from within, a.— Upper half 

 c— Lower half. 6.— Internal valve, indicated here only as 

 a projecting ridge. ■' 



Fig. 18.— The jointed ovipositor of Chhysis, Kirby and Spence. 



Plate 12. Figs. 1-6.— Male organs of Dyticus marginalis. 



Fig. I.- View of them beneath, with the last divided ventral plate, A 

 A.— The two halves of the ventral plate. B, B.— Muscles 

 that affixed them to the preceding one. C, C— Horny ridges 

 which partly serve these for insertion. D, D.— Muscles which 

 unite the transverse lidge with the ventral plates, a —A 

 horny ring lying beneath iu the prepuce, g, o.— Muscles" that 

 move the pems. /— Vasa deferentia. 



Fig. 2.— Penis and prepuce separated from the last ventral plate seen 

 from beneath, a —A horny ring that distends the prepuce. 

 Z..— Horny plate which lies in it. i.— Membranous portion of 

 the prepuce, d.— Sheath of the penis, e.— Penis, a a — 



r- o ^^"scles which move the penis. /—Vasa deferentia. 



tig. ^.— 1 he same from above, a, a.— Horny ring of the prepuce 

 running at the margin, and connected with the penis by 

 muscles, h, h. «,— Membranous portion of the prepuce k — 

 Horny plate lying in the upper part of the prepuce, i.— Horny 

 scale fo which the ends of the horny arch of the prepuce ari 

 attached, e— Penis, g, ^.—Muscles which move the penis. 

 /. — Vasa deferentia. 



Fig. 4.— The same seen from the left side, a.— Horny ring of the 

 preduce. 6.— Horny scale lying in the lower portion. The 

 rest as in the preceding. 



Fig. 5.— The penis, after the removal of the prepuce, a, a.— Mem- 

 branous 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. 6.— Penis, quite free, a,— Ridge which lies in the penis, and closes 

 Its aperture, i.— Lower channel, in which the ridge or bone 



Figs, jr -10. — Male organs of Hydrophilus piceus. 



Fig. 7.— Prepuce from above. M.— The removed colon, d, rf.— Last 

 dorsal segment, with three fenestrations, b, t.— Horny rine 

 which distends the prepuce. E, E,— Sheaths of the penis^ 



