Carchesiopygus

Beaver, Roger A. & Sanguansub, Sunisa, 2015, A review of the genus Carchesiopygus Schedl (Coleoptera: Curculionidae: Platypodinae), with keys to species, Zootaxa 3931 (1), pp. 401-412 : 404-405

Key to species of Carchesiopygus (males)

1 Apex of elytral disc with teeth of almost equal size and length on interstriae 1–7 (Figs 1, 3, 6). Pronotum without mycangial pores............................................................................................... 2

– Apex of elytral disc with more irregular spines or teeth (Fig. 5, 9–10). Pronotum with one larger and one smaller mycangial pores at the anterior end of the median line................................................................. 4

2 Teeth at apex of elytral disc at least weakly bifid on interstriae 2–7 (Figs 1, 3)..................................... 3

– Teeth at apex of elytral disc pointed on interstriae 1–7 (Fig. 6).............................. multidentatus Strohmeyer

3 Pronotum more densely punctured with a mixture of coarser and finer punctures; a broad band of denser punctures of variable size anterior to apical end of median line. Interstrial teeth distinctly tapering, bifid tip deeper. Reddish brown. (Fig. 1)........................................................................................... wollastoni (Chapuis)

– Pronotum less densely punctured, almost without coarser punctures; the band of denser punctures anterior to apical end of median line narrower, and more uniform in size. Interstrial teeth almost parallel-sided, very weakly bifid at tip. Dark chestnut brown. (Fig. 3)....................................................................... assamensis (Beeson)

4 Apex of elytral disc with long, pointed spines on interstriae 2–5, 7–8; interstriae 1 without a spine, spines on interstriae 2 not larger than others, interstriae 6 with a very short, pointed spine. (Fig. 5)......................... impariporus (Beeson)

– Apex of elytral disc with long, pointed spines on interstriae 2, 4, 7, 8, spines on interstriae 2 the largest; interstriae 1 with a minute spine, interstriae 3, 5, 6 with short pointed spines. (Fig. 9–10)............................. alternantes (Schedl)