TABLE OF THE PLATES. 
INSECTA. ~ 
Plate 4. Fig. 1.—Spiracle of Oryeres Nasicornis, seen from the front. a, a.— 
Plate 5. 
The projecting margin. 6, b.—Horny plates, which form its 
lips. 
Fig. b= =The bane, seen from the side. a.—Projecting margin. b, b.— 
The separated integument in the vicinity of thespiracle. ¢, c. 
—Posterior projecting margin of the spiracle. d, d.—The two 
horny triangles, which lie on one side of the main stem of the 
trachea, which join at *, and are moved by the broad muscie, 
. Sf, f; f—Branches of the trachem. 
Fig. 3.—The same, from beneath. a, a.—External projecting margin. 
b, b.—Separated integument. c.—Spot where the apex of the 
lower triangle articulates with the margin of the spiracle that 
projects inwardly. d.—The lower horny triangle. ff f, f— 
Stems of the trachez. 
Fig. 4.—Spiracle of the larva of Ceronta AtRATA. a, a.—The external 
darkly-coloured margin, which is decorated with paler elliptical 
spots. b, b.—The central paler horny plate. c.—Margin of 
the true aperture. d,d.—Branches of tracheex. 
Fig. 5.—Last abdominal segment, with the ovipositor A, of Sirex JUVEN~- 
cus. B,B.—Lateral margins of the last largest segment. 
Fig. 6.—Apex of the abdomen, from the side. The ovipositor, b, projects 
from the two valves, a. 
Fig. 7.—Apex of the ovipositor, seen from above. c.—The divided dentate 
apex of the sheath, d, d.—The two dentate sete within the 
sheath. 
Fig. 8.—The ovipositor, from the side. c.—Theupperchannel. d.—The 
single lower seta. 
Fig. 9.—From beneath. c,c.—Sheath. d, d,—Sete. 
Fig. 10.—One seta, to exhibit the shape of the teeth upon it. 
Fig. 1!.—Transverse section of the ovipositor. a, a—The external 
valves. e.—The sheath. d, d.—The sete. e.—Central free 
channel. 
Fig. 12.—Apex of the ovipositor. a.—The upper channel. b.—The fine 
seta. 
Fig 13.—Section of the mere ovipositor. @.—Channel. b.—Seta. c. 
—Canal. 
Fig. 14.—Section of the ovipositor, with the valves. a.—Channel. b.— 
Seta. c, c.—Valves. e.—Canal, 
Fig, 15.—Last bent segment of an ovipositor of Cynips QUERCIFOLIA, with 
the two hairy processes originating from the internal surface. 
Fig. 16.—The ovipositor. a, a—Valves. 6, 6.—External channel of the 
sete. c.—Central finer seta. 
Fig. ]7.—The external. 6, b, and the central seta. c, alone. 
Fig. 18.—Section. a, a.—Valves. b, b.—External sete. c.—Central 
one. 
Fig. 1,—-United testes of PonTIa BRASSICE. 
Fig. 2.—Testes of LiseLucria, Suckow. 
Fig. 3.—Testes of APHROPHORA SPUMARAL, 
Fig. 4.—Testes of Triputa crocara, Suckow. 
Fig. 5.—Testes of RANATRA LINEARIS. 
Fig. 6.—Half of the poison vessel of APIS MELLIFICA. 
Fig. 7.—Testes of Dyriscus MARGINALIS. a.—Large knob, 0.—Small 
knob of the dnet. 
Fig. 7. 6.—Testes of Sitpra opscura, L. Duf. 
Fig. 8.—Testes of Hypropuitus Pickus, Suckow. 
Fig. 9.—Testes of Ticrnopes, Suckow. 
Fig. 10.—Testes of Locusta virIDISSIMA. 
Fig. 11.—Testes of Stapuyiinus, L. Duf. 
