FIG. 
19. 
20. 
m Co ho 
14, 
EXPLANATION OF THE PLATES. 723 
Abdomen, and part of postpectus of g. Lateral view, 
with the covers removed to show the machinery. 
Alitrunk. Upper side. Pentatoma. 
PLATE IX.? 
. Alitrunk of Cossus ligniperda. Upper side. 
. Part of ditto, to show the mesophragm. 
Under side. 
. Patagia of Lepidoptera. Upper and under sides. Vol. Il. 
p. 367, 537. 
. Tegule of ditto. Two species. Vol. III. p. 376. 
. Prothorax of Z’shna. a. The base elevated and forming 
an obtuse angle with the rest. 
. 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. 
Lateral view. a. A piece by which 
the mid-leg is connected with the scapular. Vou. III. 
. p. 48, 563. 
. Part of the abdomen of Lidellula. 
- Trunk of Sialis. Upper side. 
. Alitrunk of Vespa Crabro. Upper side. a. Aperture in 
the trunk for the passage of the ligament that elevates 
the abdomen. 
. Lateral view of ditto. 
posterior part of ditto, and of the base of 
the abdomen, to show the above apparatus. a. The 
aperture. Vox. III. p. 700. : 
Head and part of the manitrunk of Tenthredo L. to show 
the membrane a. representing the prothorax. Vor. III. 
p. 549—. 
* Vou. Il. p. 366—, 527—. IV. p. 335—. 
Z3aQZ 
