1	Pygidium with deep foveae in basal corners (connected by sulcus or not)…2
–	Pygidium lacking deep basal foveae, pygidial sulcus uniform in width or lacking entirely	7
2	Pygidial foveae not connected by marginal sulcus (Fig. 67F)	Operclipygus disconnectus sp. n.
–	Pygidial foveae connected by deep marginal sulcus	3
3	Anterior portion of submarginal pronotal stria detached from lateral stria, recurved slightly posterad (Fig. 64G)	Operclipygus fungicolus (Wenzel & Dybas)
–	Anterior portion of submarginal pronotal stria connected to lateral stria	4
4	Propygidium with large lateral areas of dense ground punctation only, secondary punctures restricted to basal margin and narrow median band (Fig. 64B); outer subhumeral stria generally interrupted; inner subhumeral stria present for short distance behind middle	Operclipygus fossipygus (Wenzel)
–	Propygidium with only small posterolateral areas devoid of secondary punctures; other characters varied	5
5	Inner subhumeral stria absent; Central America	Operclipygus gibbulus (Schmidt)
–	Inner subhumeral stria impressed; South America	6
6	Basal pygidial fovea small (Fig. 67E); known from western slope of Ecuadorian Andes	Operclipygus therondi Wenzel
–	Basal pygidial fovea large (Fig. 64D); widespread in low and middle-elevations of Amazonia and eastern Andean foothills	Operclipygus foveipygus (Bickhardt)
7	Pygidium lacking marginal sulcus (Fig. 67H)	Operclipygus olivensis sp. n.
–	Pygidium with marginal sulcus	8
8	Body subdepressed, elongate, parallel-sided, rufescent (Fig. 67A); anterior pronotal margin not at all produced	Operclipygus subdepressus (Schmidt)
–	Body rounded, rufo-piceous (Fig. 67C); anterior pronotal margin weakly produced	Operclipygus simplicipygus sp. n.