196 HEMIPTERA, 



II. Abdomen more or less distinctly spi- 

 nous at the base. (RHAPHIGAS- 

 TRIDES, A. fy S.) 



A. Abdomen with a central furrow 

 (basal spine very short). 



a. Margins of the ventral furrow not 

 keeled ; metasternum dilated into 

 a broad flat plate ; scutellum very 



large 25. CATAULAX, 



b. Margins of the ventral furrow 

 * keeled ; metasternum small ; scu- 

 tellum of ordinary size and form 26. BATHYCCELIA. 



B. Abdomen smooth or keeled, not 

 furrowed longitudinally (basal spine 

 variable). 



a. Sternum not keeled, or with only 

 a faint longitudinal ridge. 



1 . Anterior tibiae more or less di- 

 lated on the outside 2?. CATACANTHUS. 



2. Anterior tibiae simple. 

 a. Tarsi 3-jointed. 



* Antennae with the second 

 joint about half the length 

 of the third; basal joint 

 generally passing the apex 



of the head 28. VULSIREA. 



f Antennae with the second 

 joint always more than 

 half the length of the 

 third. 



a. Lateral lobes of the head 

 meeting beyond the cen- 

 tral lobe. 



** Rostrum long, reach- 

 ing the base of the 



abdomen 23. TROPICORIS. 



ft Rostrum short, not 

 passing the interme- 

 diate coxae 24. ^Eoius. 



/3. Central lobe reaching 

 the apex of the head. 

 ** Lateral margins of 



the thorax smooth . . 29. RHAPHIGASTER. 

 ft Lateral margins of 

 the thorax denticu- 

 lated 30. PRIONACA. 



