OTIORIIYNCHIDAE. 441 



Tribe ir.— OPHRYASTIIVI. 



Rostrum moderately or very robust, quadrangular or subcylin- 

 drical. Mandibles robust, never prominent or laminiforrn at tip, 

 scar round, very distinct and sometimes prominent. Mentum 

 large or at least moderate, concealing in great part the other oral 

 organs, sub-mentum rarely feebly i)edunculate. Scrobes lateral, 

 rarely (Phyxelis) visible from above, directed either toward the 

 middle of the eyes or inferiorly. Antenme moderate, scape always 

 attaining at least the eye, funicle 7-joiuted, the last usually free, 

 rarely (Cimbocera and Ophryastes) contiguous to the mass. 

 Thorax always with distinct ocular lobes which are frequently 

 fimbriate. Metasternum usually very short, side pieces usually 

 narrow, suture nearly always visible. Mesosternal side pieces 

 unequally divided, episternum and elytra! margin contiguous. 

 Intercoxal process at least moderately, sometimes very broad 

 (Rhigopsis). Abdomen variable, second segment longer than 

 the two following united (except in Ophryastes), and with the 

 first suture arcuate (except in Ophryastes and some Strangali- 

 odes). Tarsi variable, usually pubescent beneath, sometimes 

 spinous ; third joint usually deeply bilobed and broader, rarely 

 simply emarginate and not wider than the second (certain Oph- 

 ryastes, and in Cimbocera and Rhigopsis). Claws always free. 

 Body always apterous. 



The genera of the tribe form the following groups: — 



Rostrum robust, quadrangular, more or less distinctly trisulcate above ; 

 Scrobes rapidly inferior, well defined ; eyes always narrow and acute 



below, partially concealed by the ocular lobes ; 

 Abdomen with second segment rarely as long as the two following 

 together, first suture straight ; intercoxal process moderately wide. 



Ophryastes. 

 Abdomen with second segment longer than the two following together, 

 first suture strongly arcuate ; intercoxal process very broad. 



ITiiiGorsES. 



Rostrum less robust, subcylindrical, never sulcate above ; scrobes feebly 



inferior, usually directed toward the eyes or visible from above and 



badly defined ; eyes oval, not acute below and usually entirely free ; 



Scrobes entirely lateral. Strangaliode3. 



Scrobes visible from above. Puyxeles. 



