486 HEMIPTERA. 



of the mesosternuin ; abdo- 

 men rather narrow, convex. 



a. Head filled up between 

 the antenniferous tuber- 

 cles 7. GONOCERUS. 



b. Head emarginate in front. 8. CERATOPACHYS. 

 f Rostrum short, scarcely 



passing the anterior coxae 

 and resting its point in a 

 notched process of the an- 

 terior margin of the meso- 

 sternum ; abdomen dilated, 



flat 9. DISCOGASTER. 



2. Head spinous in front. 



a. Basal joint of the antennae t 



cylindrical. 



* Meso- and metasternum 

 furnished with a distinct 

 canal with raised margins, 

 for the reception of the ros- 

 trum 10. AULACOSTERNUM. 



t Sternum without a canal. 



a. Antenniferous tubercles 



spinous externally .... 11. ANAS A. 



b. Antenniferous tubercles 

 unarmed ; central lobe 



spinous 12. SETHENIRA. 



/3. Basal joint of the antennae 

 prismatic. 



* Antenniferous tubercles un- 

 armed; central lobe spinous. 13. VERLUSIA. 



t Antenniferous tubercles spi- 

 nous. 



a. Spines of the antenni- 

 ferous tubercles external. 14. COREUS. 



b. Spines internal, conver- 

 gent 15. SYROMASTES. 



II. Posterior thighs more or less spinous 

 beneath, generally thickened. 



A. Head with an emargination between 

 the antenniferous tubercles, which are 



spinous internally 16. CHARIESTERUS. 



B. Head filled up between the antenni- 

 ferous tubercles. 



a. Membrane with longitudinal ner- 

 vures. 



