U> Lateral grooves faint, absent, or 

 indicated only by a row of puncta- 

 tions. (Rare species)* 5 



Lateral grooves distinct as such* 8 



5. Scutal punctations in more or less 

 definite rows of R. simus type, 

 interstitials variable but always 

 insignificant in comparison with 

 primary punctations 6 



Scutal punctations scattered, not 



in rows , fairly numerous 7 



6. Posteromedian and paramedian grooves 

 absent. Adanal shields with inner 

 margin in a straight line centrally 

 and with a peculiar protrusion at 

 juncture of inner and posterior 



margins R . LONGICOXATUS 



Figiffes 273 and 274 



Posteromedian groove long, narrow, 

 paramedian grooves shorter, wider, 

 less well defined. Adanal shields 

 with inner margin concave centrally 

 and its jimcture with posterior 



margin rounded .R. BEQUa^TI 



Figure s'ZJ^ and 250 



7. Basis capituli sharply angled lat- 

 erally and with long cornua. Scutal 

 punctations large, unequal, unevenly 

 distributed, small laterally, larger 



anteriorly R . ARNOIDI 



T'igure 245 



Basis capitiili slightly convex lat- 

 erally and with brief comua. Scutal 

 punctations medium size, superficial, u 



dense, fine laterally R. MUHLENSI 



Figures "281 and 282 



*R. distinctus atypically may have apparently shallow lateral 

 grooves due to the size and depth of the row of large punctations 

 in its bed. 



_ 587 - 



