I 
COLEOPTERA. — OUT HOP TER A. — HEMIPTERA. 11 
Coleoptera (some Staphylinidee and Nitiduladee, Dia- iig. 2 . 
perididce, some Serropalpida , Mycetophagidee , Eroty- 
lidce, and Endomychidee) live altogether on agarics, 
mushrooms, and toadstools, plants of very little use to 
man, many- of them poisonous, and in a state of decay 
often offensive ; these fungus-eaters are therefore to be 
reckoned among our friends. There are others, such as 
the stag-beetles (Lucanidee), some spring-beetles ( Elutcridee ), dark- 
ling-beetles ( Tenebrionida :), (Figs. 1-3,) and many Fig. 3. 
bark-beetles (Helopidce, Cisteladce, Serropalpidce, CEle- 
meradce, Cucujadce, and some Trogositadce), which, liv- 
ing under the bark and in the trunks and roots of old 
trees, though they may occasionally prove injurious, must 
on the whole be considered as serviceable, by contribut- 
ing to destroy and reduce to dust plants that have passed imago, 
their prime and are fast going to decay. And, lastly, 
the blistering-beetles ( Cantharidida:) have, for a long time, been 
employed with great benefit in the healing art. 
2. Ortiioptera ( Cockroaches, Crickets , Grasshoppers , dfc.). 
Insects with jaws, two rather thick and opaque upper wings, 
overlapping a little on the hack, and two larger, thin wings, 
which are folded in plaits, like a fan. Transformation par- 
tial. Larvae and pupae active, hut wanting wings. 
All of the insects of this order, except the camel-crickets ( Man - 
tided), which prey on other insects, are injurious to our household 
possessions, or destructive to vegetation. 
3. Hemiptera (Bugs, Locusts, Plant-line , $c.). Insects 
with a horny beak for suction, four wings, whereof the 
uppermost are generally thick at the base, with thinner 
extremities, which lie hat, and cross each other on the top 
of the back, or are of uniform thickness throughout, and 
slope at. the sides like a roof. Transformation partial. Larva; 
and pupae nearly like the adult insect, but wanting wings. 
The various kinds of field and house bugs give out a Strong and 
disagreeable smell. Many of them (some Pcntatomadce and Lg- 
Pupa. 
