HEMIPTERA HETEROPTERA. $1 
tt Prothorax transversely trapeziform. : - PLATYPLAX. 
** No hooks on the areolets. 
+ Prothorax in front with a short middle keel, 
t First joint of the rostrum as long as the head. - Cymus. 
tt First joint of the rostrum shorter than the head. - CymMopEMA. 
tt Prothorax with no middle keel. 
{ Fore wings with no membrane. - - - ANOMALOPTERA. 
tt Fore wings with a membrane. 
§ Apical veins of the wing-areolets not petiolated. 
x Cheek segments small, linear. 
o Rostrum extending to the second ventral segment. OxyYcARENus. 
oo Rostrum not extending beyond the middle of the 
mesopectus. - - - - Bracuyprax. 
XX Cheek segments peleroacd: - -  Camproretus. 
§§ Apical veins of the wing areolets petiolated. 
Cheek segments broad. - - - - Macropiax. 
xX Cheek segments not broad, almost semicircular. 
0 Petioles of the apical veins much shorter than the 
forks. - - - = - = MeEropopr.iax. 
00 Petioles of the apical veins as long as the forks. 
— Tarsi stout. - = - - - Micropuax. 
+++ Tarsislender. - - - - -  Macroprerna. 
The genera Philomyrmex, 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 Lygeid@ are arranged as follows :— 
A. Antenne 4-jointed. 
a. Fore femora not twice longer than the hiud 
femora. 
* Membrane of the fore wings with transverse 
veins. 
+ Eyes not petiolated. 
t 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. - 2. Lyczus. 
++++ First joint of the rostrum as long as the head. - 3. C@Nocoris. 
++ First joint of the rostrum not extending beyond 
the base of the head. 
++ Fore femora unarmed. 
Antenne longer than the body. - - - 9. Matcus. 
worm Antenne not longer than the body. 
+ Third and fourth veins of the membrane united 
near the base. - - - - 4, Arocatus. 
++ Third and fourth veins of the membrane parallel 
to each other. - - - - 7. Nysivs. 
