Key to the species of Penthoscapha

Note: At least one species of Penthoscapha exhibits marked sexual dimorphism. The females of P. pulverea, P. doormanensis, and P. l o re n t z i are yet unknown. Therefore, reliable identification of the respective females with this key cannot be guaranteed.

1 Rostrum (Fig. 36) relatively long; in males 2.07–2.30 X longer than wide at base, in females 1.97–2.18 X longer than wide at base. Sides of abdominal ventrites and sides of thorax with patches of white scales (Figs. 13, 15). Sides of aedeagus converging from base to pointed apex (Fig. 37) ............................................................. P. similis

– Rostrum (Figs. 32–35, 40) relatively short; in males 1.56–1.88 X longer than wide at base, in females 1.50–1.70 X longer than wide at base. Sides of body without patches of white scales (Figs. 2, 5, 7, 9, 11, 17). Sides of aedeagus subparallel, in apical ¼ converging to extended tip (Figs. 41, 44, 47, 50) ............................................................. 2

2 (1´) Elytral sculpture coarse, at least basally foveate-rugose (Figs. 1–2, 4–7, 16–17). ................................................... 3

– Elytral sculpture shallow; striae regularly punctate; elytra evenly convex without costate intervals (Figs. 8–11). 5

3 (2) Elytral intervals even, without longitudinal ridges ..................................................................................... P. toxopei

– Elytral interval 3 and 7 costate.................................................................................................................................. 4

4 (3) Elytral sculpture deeply foveate-rugose from base to apex; microsculpture at apical declivity coriaceous (Fig. 20); lateral contour of elytra (Figs. 4, 6) convex ................................................................................. P . gerhardschereri

– Elytral sculpture basally foveate-rugose, apically more shallow; microsculpture at apical declivity granulate (Fig. 22); lateral contour of elytra (Fig. 1) subangulate ...................................................................................... P. l o re n t z i

5 (2´) Elytra densely setose; setae of well-preserved specimens trapping particles of exocuticular pigment lending elytra a uniform ochre colour (Figs. 8–9, 67) ..................................................................................................... P . pulverea

– Elytra subglabrous, with sparse setae; well-preserved specimens between stria 3 and 4 with band of yellowish exocuticular pigment (Figs. 10, 69) .................................................................................................. P . doormanensis