8. a) Gena in posteroventral view with a prominent robust process protruding downward (Figure 13a) ..... M. (Sayapis) pugnata Say

b) Gena in posteroventral view uniformly convex, without process (Figure 13b) ..... 9
Figure 1a
Figure 1b

Figure 13a: Gena with a prominent robust process
Click to Enlarge →           a

Figure 13b: Gena without a prominent robust process
Click to Enlarge →           b