HEMIPTERA HETEROPTERA,. 29 
«» Rostrum extending to the tip of the abdomen. - Mecorsampuus. 
corm Rostrum not extending beyond the metapectus. 
+ Eyes semicircular. - - - - HENESTaRIs. 
++ Eyes elongated. - - OpHTHaALmicus. 
++ Sides of the prothorax with distinct keels. 
++ Prothorax excavated in front. 
‘ Head triangular. - - - - PLINTHISsuS, 
wor Head pentagonal. - - - - Drymus. 
++++ Prothorax straight in front. 
« Prothorax elongated or almost rectangular. 
-+ Rostrum extending to the middle of the meta- 
pectus. = - - - IscHNOCORIS. 
++ Rostrum extending to the pind border of the 
mesopectus. 
= Fore femora unarmed, rarely with some bristles 
on the under edge. 
© Second joint of the rostrum longer than the first. MacropEMa. 
©© Second joint of the rostrum shorter than the first. AOPLOSCELIS. 
== Fore femora with one or more spines beneath. 
© Fore femora with a stout spine near the tip. -  MeEGaLonorus. 
©© Fore femora with two minute eUucs in the 
middle. - - - -  PreRoTMETUS. 
wou Prothorax trapezifurm, varying in Jength. 
+ Head longer than the breadth of the neck. 
= Body and limbs roughly hairy. - - = Lasrocoris, 
== Body and limbs bare, or at most finely hairy. 
© Fore femora not very thick. = = - PERITRECHUS. 
©© Fore femora very thick. - TropisTeruus. 
+-+ Head shorter than the breadth of the nee 
= Sides of the prothorax straight. 
© Body bare, smooth, shining. = - - - LaMPRODEMA. 
©O© Body wholly pubescent. - 2 : Pionosomus. 
== Sides of the prothorax excavated. 
© Prothorax with a cone euoua rim on the fore 
border. - - - - Lastiosoma. 
©© Prothorax with no rim on the fore border. 
V Fore femora unarmed. - - Acompus. 
VV Fore femora with bristles on both edges beneath. SryGnus. 
oo Sides of the prothorax foliaceous. 
— Sides of the prothorax foliaceous only on the 
hinder half. - : = - -  HomaLopEMa. 
++ Sides of the prothorax foliaceous along the whole 
length. 
++ Fore border of the prothorax with a rim. 
« Rostrum slender, extending to the hind border 
of the metapectus. —- - - - EreMocoRIS, 
wo Rostrum stout, exieuding to the hind border of 
the mesopectus. - - - - SCOLOPOSTETHUS. 
++++ Fore border of the prothorax with vo rim. 
« First joint of the hind tarsi only a little longer 
than the second and third joints together. 
