SYSTEM OF INSECTS. 403 
have been considered as such by preceding Entomolo- 
gists. The four Tribes into which the two subsections 
Geodephagowa and Hydradephagena appear resolvable, 
are not only distinguished by the characters of the per- 
fect insect, but likewise by those of their larva?, which 
are constructed on four distinct types ; those of the Gy- 
roncchma being the most perfectly Chilopodimorphous 
of the whole, and those of the Eunechma the least so a . 
The former appear rather to form an osculant tribe, or 
one without the circle, than one within it ; and to be go- 
ing off towards another section, including Hydrophilus^ 
SphcBridium^ &c. I must observe, that between Dytisci4s 
and Hydrophilus there is a striking agreement both in 
their form and habits in the larvae a , and even in seve- 
ral characters in the perfect insect ; so as in many re- 
spects to generate a doubt whether they ought not to 
enter the same circle and to follow each other. Yet the 
change of habits in the latter, which from a carnivorous 
larva becomes a herbivorous beetle ; the consequent 
change of structure in their oral organs, their antennas, 
and other striking differences ; and the evident interven- 
tion of the Gyrouechma and some other osculant tribes be- 
tween the two, forbid their union in one and the same circle. 
vi. I need not say more on those larger groups of an 
Order which conduct us to what are denominated its 
a Vol. HI. p. 167—. I formerly hinted {Ibid. p. 163.) that the 
larva of Cicindela may be regarded as Araneidiform : this is further 
confirmed by its having eight eyes, (and not six,) as I have since dis- 
covered, and by the aspect of its large head and prothorax. The 
other larvae of the Adephagana have twelve eyes. — Mr. Stephens 
(Illustrations of British Entomology. n°. xv. p. 175.) has confirmed 
the above statement, as to the number of eyes of the larva of Cicin- 
dela . 
2 D 2 
