PLATE IX.[2197]

FIG.
1.Alitrunk of Cossus ligniperda. Upper side.
2.Part of ditto, to show the mesophragm.
3.————— Under side.
4.Patagia of Lepidoptera. Upper and under sides. Vol. III. p. 368, 539.
5.Tegulæ of ditto. Two species. Vol. III. p. 378.
6.Prothorax of Æshna. a. The base elevated and forming an obtuse angle with the rest.
7.Alitrunk of ditto. Upper side. a. Two elevated areas of the posterior parts of the collar, strengthened by a marginal ridge and denticles, internally connected by an elastic ligament, apparently to aid and sustain the powerful action of the wing-muscles.
8.——————— Lateral view. a. A piece by which the mid-leg is connected with the scapular. Vol. III. p. 48, 565.
9.Part of the abdomen of Libellula.
10.Trunk of Semblis F. Upper side.
11.Alitrunk of Vespa Crabro. Upper side. a. Aperture in the trunk for the passage of the ligament that elevates the abdomen.
12.Lateral view of ditto.
13.—————— posterior part of ditto, and of the base of the abdomen, to show the above apparatus. a. The aperture. Vol. III. p. 701.
14.Head and part of the manitrunk of Tenthredo L. to show the membrane a. representing the prothorax. Vol. III. p. 550—.
15.Alitrunk of Xiphydria. Upper side.
16.————————— Lateral view.
17.Part of trunk and abdomen of Formica, to show the squama. Vol. III. p. 389. 3.
18.——————————– of Myrmica, to show the nodus. Vol. III. p. 389. 4.
19.Alitrunk of Musca. Upper side. a. Alula or winglet.
20.Metathorax of ditto.
21.Alitrunk of ditto. Lateral view.
22.Abdomen of ditto. Venter.

[Plate X]

PLATE. X.[2198]

N.B. In this plate the red points out the costal, and the yellow the anal areas, the intermediate being uncoloured.

FIG.
1.Elytra, a. Base. b. Shoulder. c. Lateral margin. d. Apex.
2.Tegmina. Blatta.
3.Hemelytra. Pentatoma.
4.Wing. Coleoptera. a. An insulated nervure. Vol. III. p. 625.
5.——– Dermaptera.
6.——– Lepidoptera.
7.——– Neuroptera.
8.——– Hymenoptera. Tenthredo L.
9.————————– Bombus.
10.Under wing. Hymenoptera.
11.——————————— Proctotrupes.
12.————— Diptera. Tipula.
13.————————— Psychoda. Vol. III. p. 645.
14.————————— Musca. a b. Two areolets between the costal and mediastinal nervures. c. Areolet between the mediastinal and postcostal nervures. d. Areolet between the postcostal and subcostal nervures, e. Open areolet. Vol. III. p. 634.
15.Under wing. Diptera. Stratyomis. a b. The two areolets between the costal and postcostal nervures; the mediastinal being nearly obsolete. c. Middle areolets crowned by a small one, d.