INSECTS. 
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suction, the rostrum consisting of an articulated tubular sheath, 
which includes four scaly setae, instead of mandibles and jaws; 
some species have crustaceous elytra, with membranous pos¬ 
terior extremities ; in others they are similar to wings, but more 
extended, thicker and coloured. 
Section I.— Heteroptera. 
The rostrum attached to the anterior extremity of the head ; 
with horizontal wings and elytra, terminated abruptly by a 
membranous appendage. 
TRIBE I.-GEQCORISiE. 
With the antennte inserted near the internal margin of the 
eyes, and longer than the head ; tarsi three-jointed, the first 
very short. 
Genus CIMEX.— Linnaeus. 
Generic Character. — Rostrum short, three-jointed, as well as 
the tarsi, the first very short; body apterous, ovoid, membra¬ 
nous, and depressed ; the posterior part of the head received 
into a short transverse thorax; antennae placed before the eyes ; 
somewhat longer than the head and thorax, setaceous and four- 
jointed, the second and third very large. 
Cimex prasinus — The Leek Green Bug. 
Plate XCIX. fig. 2. 
Body green, without spots, yellowish-green below; abdomen 
black above, the margin spotted with yellow; legs six, of a 
yellow colour ; antennae reddish-brown ; three last joints tipped 
with black. Inhabits Europe. 
TRIBE II.-HYDROCORISjE. 
The antennae inserted under the eyes, concealed, and not 
exceeding the length of the head ; joints of the tarsi never ex¬ 
ceeding four. 
Genus NEPA.— Latreille. 
Generic Character. —A large folding hook formed under the 
thighs, from the union of the legs and tarsi; tarsi consisting 
of a single joint; antennae semiforked; body oval, greatly de- 
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