| mandible | curved upward in lateral view; length as long as head; middle tooth obtuse, located near basal tooth in dorsal view (figs. 15, 19) | curved upward in lateral view; length as long as head; middle tooth bluntly pointed, located medially, between apex and middle tooth with an obtuse lobe (figs. 16, 20) | straight and longer than head in lateral view; middle tooth protruded medially in dorsal view (figs. 17, 21) | slightly curved downward in lateral view; longer than head; middle tooth located medially (figs. 18, 22) |
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| head | cephalic hump large and blunted, slightly curve downward in lateral view; post-ocular margin obtusely pointed forward (figs. 15, 19) | cephalic hump large and blunted, slightly curved downward in lateral view; post-ocular margin slightly sharp and protruding forward (figs. 16, 20) | cephalic hump narrow and blunt, anterodorsally protruding in lateral view; post-ocular margin largely obtuse backward (figs. 17, 21) | cephalic hump anterodorsally pointed in lateral view; post-ocular margin truncate (figs. 18, 22) |
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| pronotum | about 1.85 times wider than long; surface of pronotal disc dense with small punctures (Fig. 15) | about 1.85 times wider than long; surface of pronotal disc dense with small punctures (Fig. 16) | about2.0 times wider than long; surface of pronotal disc densely punctate (Fig. 17) | about 2.0 times wider than long; surface of pronotal disc impunctate (Fig. 18) |
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| genitalia | basal piece without distinct darker band at distal end. Paramere relatively slender and short. Median lobe relatively small (figs. 23, 24) | basal piece without distinct darker band at distal end. Paramere relatively slender and long. Median lobe relatively small (figs. 25, 26) | basal piece with distinct darker band at distal end. Paramere relatively broad. Median lobe relatively small (figs. 27, 28) | basal piece without distinct darker band at distal end. Paramere relatively broad and short. Median lobe relatively large (figs. 29, 30) |
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