HEMIPTERA. 



195 



2. Scutellum of the usual form, 

 more or less triangular. 



a. Upper surface of the head 

 plane ; the lateral margins 

 not reflexed. 



* Lateral angles of the tho- 

 rax unarmed or simply 

 prominent*. 



a. Second joint of the 

 antennae much shorter 

 than the third. 

 ** Head very large, 

 porrected; antennife- 

 rous tubercles promi- 

 nent 17. MASSOCEPHALUS. 



tt Head moderate, de- 

 flexed; antenniferous 

 tubercles entirely con- 

 cealed 18. APINES. 



/3. Second joint of the an- 

 tennae nearly as long or 

 longer than the third. . 19. PENTATOMA. 

 t Lateral angles of the tho- 

 rax more or less distinctly 

 spinous* 8. MORMIDEA. 



b. Lateral margins of the head 

 more or less reflexed. 



* Antennae 4-jointed. 



a. Body nearly orbicular ; 

 tibiae cylindrical, fur- 

 rowed on the outside 

 only towards the apex . 20. EPIPEDUS. 



/3. Body ovate ; tibiae tri- 

 angular, furrowed ex- 

 ternally from base to 



apex 21. APLEROTUS. 



t Antennae 5-jointed 22. STRACHIA. 



* Some species of the genus Mormidea have the lateral angles of 

 the thorax unarmed, but in other respects they so closely resemble the 

 rest of that genus, that it is impossible to separate them. The Cimex 

 pugillator of Fabricius possesses spines at the lateral angles of the 

 thorax, of a similar nature to those generally existing in the Cantao 

 icellatus (Cimex ocellatus, Thb.) ; but as in its other characters this 

 species approaches very closely to Cimex rufiventris, Germ., it does 

 not appear desirable to separate it from that species, and it is accord- 

 ngly placed in the genus Pentatoma. 



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