532 HEMIPTERA, 



2. Anterior thighs spinous be- 

 neath 3. ORSILLUS. 



B. Membrane with two or more basal 

 cells. 



a. Corium with two distinct cells 

 on its posterior margin ; the two 

 inner nervures of the membrane 



not touching one another .... 5. HETEROGASTER. 



b. Corium without cells on its pos- 

 terior margin; the two inner 

 nervures of the membrane much 

 distorted near the base and 

 touching one another at that 



point 6. LETH^US. 



II. Membrane destitute of basal cells, 

 the nervures not being united by 

 transverse nervures. 



A. Anterior thighs spinous beneath. 



a. Basal joint of the antennae not 

 longer than the head. 



1. Body oblong or elongated, 

 not flattened; abdomen as 



broad as the elytra 8. RHYPAROCHROMUS. 



2. Body ovate, very flat, with 

 the abdomen nearly as broad 



as the elytra 10. PL ATY CASTER. 



3. Body ovate, flat above, with 

 the abdomen very narrow, fur- 

 rowed down the centre 11. STENOG ASTER. 



b. Basal jointof the antennae longer 



than the head 9. ORTH^JA. 



B. Anterior thighs unarmed. 



a. Head very broad, with the eyes 



very large 14. OPHTHALMICUS. 



b. Head narrower than the thorax. 



1. Abdomen smaller than the 

 elytra; membrane with five 

 neiTures, of which the two in- 

 ner run parallel to one another 

 to the base, and the other 

 three rise from a common 



point 15. CYMUS. 



2. Abdomen as large as or larger 

 than the elytra; membrane 

 with four or five parallel ner- 

 vures. 



