Couplet 139

139a:  Pygidium at least partially exposed, strongly sclerotized, punctate, distinctly different from other tergites (Figures 26-57A,B); tibiae usually spinose or denticulate on external margin

Nitidulidae   p. 430

139b:  Pygidium not exposed, not strongly sclerotized, similar to other tergites (Figure 26-60B); tibiae smooth on external margin