1	Apical elytral punctures absent; metaventral punctures discretely limited to posterior one-third of metaventral disk (Fig. 19H); 4th dorsal elytral stria abbreviated; aedeagus rather strongly bent ventrad near apex (Fig. 20H); Guianas	Operclipygus itoupe sp. n.
–	Apical elytral punctures present; aedeagus more evenly rounded to straight near apex; other characters variable	2
2	Supraorbital stria complete; apical elytral punctures mostly restricted to apical margin	3
–	Supraorbital stria interrupted; apical elytral punctures extending forward between striae up to one-third from apical margin	4
3	Outer lateral metaventral stria well developed, extending from mesometaventral suture to at least metaventral midpoint (Fig. 6C); metaventral punctures present on most of metaventral disk; mesoventrite truncate, not distinctly emarginate; aedeagus parallel-sided throughout length, rather bluntly rounded apically (Fig. 20I); Central America to extreme northwestern South America	Operclipygus punctiventer sp. n.
–	Outer lateral metaventral stria weaker, frequently not reaching forward to mesometaventral suture (Fig. 19B); punctures of metaventrite discretely limited to posterior half of central part of disk; mesoventrite distinctly emarginate; aedeagus narrowed in most of apical half, apex subacute (Fig. 20D); South America	Operclipygus sejunctus (Schmidt)
4	Marginal pronotal bead convex, widening toward front	5
–	Marginal pronotal bead not distinctly convex, similar in width throughout length	6
5	Male metaventrite depressed and setose (Fig. 19G); body broad and strongly depressed, more in male than female, but notable in both sexes; outer metaventral stria paralleling inner lateral metaventral stria along at least half its length; aedeagus short, broad, with strong medioventral process (Fig. 20D)	Operclipygus setiventris sp. n.
–	Metaventrite not sexually dimorphic, convex and lacking setae in both sexes; outer metaventral stria shorter, usually present as only a short fragment near middle of inner metaventral stria; aedeagus elongate, narrow, medioventral process less strong (Fig. 20G)	Operclipygus depressus (Hinton)
6	Dorsum faintly bicolored, with pronotum rufescent (Fig. 19C); aedeagus with apicolateral corners minutely, acutely produced (Fig. 20E); only known from a single locality in Santa Cruz, Bolivia	Operclipygus pecki sp. n.
–	Dorsum unicolorous; aedeagus with apex simply subacute (Fig. 20F)	Operclipygus juninensis sp. n.