HEMIPTERA HETEROPTERA. 
31 
$ Prothorax transversely trapeziform. 
** No hooks on the areolets. 
+ Prothorax in front with a short middle keel. 
+ First joint of the rostrum as long as the head. - 
$ First joint of the rostrum shorter than the head.- 
ft Prothorax with no middle keel. 
| Fore wings with no membrane. - 
+t Fore wings with a membrane. 
§ Apical veius of the wing-areolets not petiolated. 
X Cheek segments small, linear, 
o Rostrum extending to the second ventral segment, 
oo Rostrum not extending beyond the middle of the 
mesopectus. _ 
X X Cheek segments half-round. - 
§§ Apical veins of the wing areolets petiolated. 
X Cheek segments broad. - 
X X Cheek segments not broad, almost semicircular, 
o Petioles of the apical veins much shorter than the 
forks. - 
oo Petioles of the apical veins as long as the forks, 
-r- Tarsi stout. - - - 
— i — t- Tarsi slender. ----- 
Platt plax. 
Cymus. 
Cymodema. 
Anomaloptera. 
OxYCARENUS. 
Brachyplax. 
Camptotelus. 
Macroplax. 
Metopopi.ax. 
Microplax. 
Macropterna. 
The genera Pbilomyrmex, of Sahlberg, and Aphanosoma, of Costa, 
are not indicated by Fieber in his Synopsis, from want of definite informa- 
tion respecting them, and for the same reason they are omitted here. 
In this Catalogue the genera of Lygaeidae are arranged as follows: — 
A. Antennae 4-jointed. 
a. Fore femora not twice longer than the hind 
femora. 
* Membrane of the fore wings with transverse 
veins. 
t Eyes not petiolated. 
J Eyes not contracted behind. 
§ First joint of the rostrum not in a furrow. 
X Fore femora not or hardly thicker than the hind 
femora. 
o Membrane with one basal areolet. 
-*■ First joint of the rostrum extending beyond the 
base of the head. 
++ First joint of the rostrum longer than the head. - 
+++ 4 . First joint of the rostrum as long as the head. 
-+-+ First joint of the rostrum not extending beyond 
the base of the head. 
4 -+ Fore femora unarmed. 
Antennae longer than the body. - - - 
Antennae not longer than the body. 
-f- Third and fourth veins of the membrane united 
near the base. - 
— |- Third and fourth veins of the membrane parallel 
to each other. - - - - 
2. Lyg.eus. 
3. CcENOCORIS. 
9. Malcus. 
4. Arocatus. 
7. Nysius. 
