EXPLANATION OF PLATES. 837 
Puate VII. Insects. 
With the exception of figs. 4 and 5, all the figures are from nature. 
Fig. 
t=) 
bo 
Lithobius forficatus, p. 294. Natural size. 
Oral organs, head and antenne of a large Scolopendra, slightly 
magnified. A, head; B, antenna; a a, upper jaws; 6 6, under 
jaws; ¢, under lip; d’, first; d”, second; d@’”, third pair of feet. 
Oral organs of Gryllotalpa vulgaris, magnified, illustrating p. 249. 
A, upper lip; B, upper jaws; c, under jaws; c’c’, palps; ¢”c”, 
galea or helm of the lower jaws (internal palps); D, ander 
lip with its palps d d. 
ae 4,5. Head, spiral tongue and other oral organs of Noctua poe, 
ig. 10. 
Fig. 
HY. 
magnified ; after Savieny Mémoires, 1. Pl. 1m. fig. 1. Compare 
p: 250. 
Fig. 4. A, basal piece of antenna, a a, compound eyes; 56, 
upper jaws; e’, under jaws (spiral tongue) ; d’ d’, attachment of 
the palps of the under lip that have been removed. 
Fig. 5. The under lip c, with its palps ¢’ c’, divested on the 
left side of the hairs with which they are beset. 
Intestinal canal of Gryllotalpa vulgaris, natural size, to illustrate 
pp-253—256; a, esophagus ; 6, crop or proventriculus ; c, muscular 
stomach, with two blind appendages near its inferior orifice ; d, e, 
stomach, or duodenum, according to M. pp Serres; g, /, intes- 
tinal canal, slightly unrolled, as in e; f, the short and numerous 
urinary vessels, which terminate by a common efferent duct at ¢. 
The two secretory tubes of the web in Cossus ligniperda, natural 
size, see p. 392. 
A Gryllotalpa vulgaris not yet full grown, shewing the air-slits 
(stigmata) 1—10, see p. 261. This figure may serve at the same 
time as an example of imperfect metamorphosis, see p. 273. 
A portion of a stem of the air-tubes with three branches from 
a large Scolopendra, see p. 259. 
Internal sexual organs of male Gryllotalpa vulgaris, magnified 
two diameters, to illustrate pp. 267—269 ; wa, testes ; bb, efferent 
vessels ; ¢ c, prostate (blind tubes, pp. 268, 269); c’, such a tube un- 
rolled; d, base of penis, covered on the upper surface with small 
blind vascules like vil/i (CowPrr’s glands ?). 
Internal sexual organs of female of the same species; aa, 
ovaries ; bb, oviducts ; ¢, blind sac (receptaculwm seminis), of 
which the very fine duct c’ terminates in the vagina. See pp. 265, 
266. 
