Fig. 
Fig. 
Fig. 
Fig. 
falls 
ig. 14. 
lO. 
16. 
Ee) ie 
7 
8. 
EXPLANATION OF PLATES. 
. Nervous system of Gryllotalpa vulgaris magnified two diameters, 
see p. 276; 1, first nerve-ganglion with the optic nerves and 
those of the antennae, behind it a ring, through which the 
cesophagus passes ; 2—10, the succeeding nerve-ganglia. 
Head and first piece of thorax (prothorax, corselet) of Gryllotalpa 
vulgaris seen from above, slightly magnified; A, A, compound 
eyes; @, a, simple eyes, ocelli or stemmata. See p. 249. 
A small piece of the cornea of a compound eye from Sphina 
atropos, with the hexangular /acettes, magnified 200 diameters ; 
see p. 279. 
A piece of the under surface of an upper wing from Vymphalis 
urtice, p.411, magnified more than 40 diameters, and drawn by 
means of incident light. The surface divested of scales then 
appears black ; the places for the attachment of the scales are 
seen as white points. Comp. p. 390. 
Scales from the upper surface of the upper wing of the same 
insect, magnified about 75 diameters, and drawn by means of 
transmitted light under a microscope of OBERHAUSER, p. 390. 
Puate VIII. Insects. 
Scales of Machilis maritima, p. 297, seen under the microscope. 
Lepisma saccharina (p. 298) ; magnified and seen on the under 
surface, after G. R. Trevrranus Verm. Schr. u. Tab. 11. fig. 1. 
Trichodectes Equi magnified, as an example. of MJallophaga, 
pp. 301, 302, after Gurir Magaz. f. d. gesammt. Thierheilk. 1x. 
Tab. 1. figs. 4—6. a, from above ; B, from below, attached to a 
hair; c, the jaws; the absolute size is indicated by a line, as is 
also done in figs. 2 and 4. 
Pulex penetrans, male, (p. 305). 
The pregnant female. Both this figure and the preceding after 
DumeEriL Cons. gén. s. l. Ins. Pl. 53, figs. 4, 5. 
Xenos Peckii, female, (p. 307), after Kirpy Linn. Transact. X1., 
magnified ; a, a, the shield-covers (elytra). 
Xenos Rossii, female, magnified, after V. SIEBOLD. 
Bombylius discolor, p. 334. 
Figs. 9, 10. Upper wings of Hymenoptera, fig. 9 of Apis mellifica, fig. 10 
of Bombus ; pp. 347, 348; m, e, outer margin (margo exterior) ; 
a, apex ; 6, base ; m, p, posterior margin ; m, 7, internal margin ; 
s,t, stigma; A, radius ; C, cubitus ; ¢, 7, cellula radialis ; c,c, ¢,c, ¢,¢, 
cellule cubitales ; c, d, cellula discoidalis ; c,h, ¢,h, cellule humer- 
ales; n, b, nervi brachiales. 
