HEMIPTERA HETEROPTERA. 
45 
=# Second joint of the antennae thick and cylindrical 
in the male, clavate in the female. 
Antennae of the male and female alike. 
^ Second joint of the hind tarsi longer than the 
third. ------ 
jYA. Second joint of the hind tarsi as long as the 
third. 
== Throat hardly conspicuous. 
V Antennai long. - 
W Antennae short. 
# Hind tarsi short, stout. - - - _ 
=?=!= Hind tarsi long, slender. - 
OO Prothorax elongate-bell-shaped. 
= Second joint of the hind tarsi longer than the 
third. ------ 
== Second joint of the hind tarsi as long as the third. 
-H — )- Callus of the front proceeding from a curve. 
Neck angular. - - - - - 
-•-+++ Neck rounded. - 
00 Xyphus even or deepened. 
Xyphus even. 
+-* Face vertical. - - - 
Face oblique. 
Second joint of the hind tarsi as long as the third. 
to-.un Second joint of the hind tarsi longer than the 
third. 
0 Rostrum extending to the third or fourth ventral 
segment. _ - . - - 
OO Rostrum extending to the first ventral segment. - 
Xyphus deepened. 
++ Throat about half as long as the head. 
Throat as long as the head beneath. 
Head elongated. - - - 
uyicn Head hardly elongated. - - - - 
* Head elongated or oval. Eyes apart. 
1 Head elongated. - _ - _ 
•ff Head oval or nearly round. 
J Edge of the throat armed with two little teeth. - 
Edge of the throat unarmed. 
§ Prothorax trapeziform. - - - - 
§§ Prothorax elongated. 
X Base of the callus and inserlmn of the antennae 
between the eyes. - _ _ - 
X X Base of the callus and insertion of the antennae 
lower. 
o Head oblique. - - - - - 
00 Head vertical. 
-¥■ Head above little longer than its breadth behind. 
H — h Head above nearly twice longer than its breadth 
behind.- - - - - - 
Criocoris. 
Plagiognathus. 
Apocremnus. 
PSALLUS. 
Stbenarus. 
Agalliabtes. 
Malthacus. 
Auchenocbepis. 
Camaeonotub. 
Phylus. 
Gnostus. 
Hoplomachus. 
Pachyxyphus. 
Placochilus. 
Macrotylus. 
Ambettylus. 
Macrocolkob. 
Macrolophus. 
Odontoplatys. 
Malacocobis. 
Cyrtopeltis. 
Systellonotos. 
Brachycera:a. 
Dicyphus. 
