HEMIPTERA. 77 



B. Anterior thighs unarmed. 



a. Lateral angles of the thorax pro- 

 duced into more or less distinct 

 spines. 



1 . Anterior tibiae simple. 



a. Lateral margins of the thorax 



denticulated 12. ARMA. 



ft. Lateral margins of the thorax 



smooth 13. HOPLOXYS. 



2. Anterior tibiae dilated. 



a. Abdomen with a spine at 



the base 14. CORYZORHAPHIS. 



ft. Abdomen unarmed 15. EUTHYRHYNCHUS. 



b. Lateral angles of the thorax un- 

 armed. 



1. Abdomen with a spine at the 

 base. 



a. Ventral spine reaching the 



anterior coxae 16. MECOSOMA. 



ft. Ventral spine short, not 

 passing the posterior coxae. 

 * Lateral margins of the 



thorax denticulated .... 17. APATETICUS. 

 t Lateral margins of the 

 thorax smooth. 



a. Second joint of the an- 

 tennae much longer than 



the third 18. CERMATULUS. 



b. Second and third joints 



about equal 19. TYNACANTHA. 



2. Abdomen unarmed. 



a. Second joint of the antennae 

 more than twice as long as 

 the third 20. ASOPUS. 



ft. Second joint of the antennae 

 very little longer than the 

 third 21. ZICRONA. 



Genus 1. DISCOCERA. 



Scutellera, p., Le P. 8f Serv. Enc. Meth. x. (1825). 



Discocera, Lap. Hem. 72 (1832); Germ. Zeits. i. 20 (1839); 



Am. 8f Serv. Hem. 77 (1843). 

 Asopus, p., Burm. Handb. ii. (1835). 



