3/8 HEMIPTERA. 



1. Last joint of the antennae much 



longer than the preceding 11. MACHTIMA. 



2. Third and fourth joints of the 



antennae about equal 12. ZOREVA. 



b. Last joint of the antennae shorter 



than the third 13. CRINOCERUS. 



II. Head filled up between the antenni- 

 ferous tubercles. 



A. Third joint of the antennae more or 

 less compressed or dilated. 



a. Second and third joints of the an- 

 tennae dilated 8. SPATHOPHORA. 



b. Third joint alone compressed or 

 dilated. 



1. Third joint of the antennae 

 shorter than the second, gene- 

 rally oval or pear-shaped; pos- 

 terior tibiae dilated, especially in- 

 ternally 7. PACHYLTS. 



2. Third joint of the antennae as 

 long as the second, elongated, 

 with its margins parallel; poste- 

 rior tibiae dilated, especially ex- 

 ternally 9. MELUCHA. 



B. Third joint of the antennae cylin- 

 drical. 



a. Head with a lamella between the 

 antenniferous tubercles. 



1. Antennae, legs and body stout, 



clothed with hairs 22. METAPODIUS. 



2. Antennae and legs slender, not 

 clothed with hairs. 



a. Third joint of the rostrum 



longer than the fourth ; lateral 



angles of the thorax prominent 



or spinous 23. PETALOPS. 



. Third joint of the rostrum 



shorter than the fourth; lateral 



angles of the thorax unarmed . 24. PLAXISCELIS. 



b. Head not furnished with a lamella 

 between the bases of the antennae. 



1. Second joint of the antennae 



longer than the first 15. PHYSOMERUS. 



2. Second joint of the antennae not 

 longer than the first. 



a. Scutellum triangular. 



