Couplet 169

169a:  Last visible segment of abdomen forming a terminal spine (Figure 26-63); body wedge-shaped, humpbacked; head retracted to
hypognathous position; hind tibia and tarsus usually with oblique or transverse, comb-like serrate ridges subapically on lateral faces

Mordellidae  p.434

169b:  Abdomen not prolonged into a terminal spine; body otherwise variable; hind tibia and tarsus without comb-like serrate ridges as in preceding entry; if similar combs are present, then they are apical

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