Histeromorphus Kraatz, 1865

Purchart, Luboš, 2014, Revision of the genus Histeromorphus (Coleoptera: Tenebrionidae) from the Socotra Archipelago with descriptions of three new species *, Acta Entomologica Musei Nationalis Pragae 54, pp. 211-230 : 226-227

Key to species of Histeromorphus Kraatz, 1865

1 Anterior margin of clypeus straight ( Fig. 12 ). Posterior angles of pronotum sharp. Lateral margin of pronotum distinctly thickened, with groove along its entire length. Hypomeron longitudinally wrinkled, meso- and metaventrite longitudinally wrinkled and granulate. Elytra with transverse wavy lines ( Fig. 6 ). Abd el Kuri. .......... H. undatus Gahan, 1900

– Anterior margin of clypeus slightly or strongly sinuate, never straight ( Figs 7–11 ). Posterior angles of pronotum obtusangulate. Lateral margin of pronotum bordered but not thickened; without any groove along its length. Hypomeron, meso- and metaventrite smooth, not wrinkled or granulate. Elytra smooth or sculptured but in this case never with distinct transverse wavy lines ( Figs 1–5 ). Socotra, Darsa, Samha. ............................................ 2

2 Anterior margin of profemur on its ventral side with distinct keel along its ¾ or entire length; simultaneously entire posterior margin of profemur on its dorsal side with row of long yellow setae ( Figs 13, 15 ). Median lobe strongly curved upwards, nearly rectangular (in lateral view) (Figs 31, 39). ........................................................................................ 3

– Anterior margin of profemur on its ventral side rounded, not keeled; posterior margin on its dorsal side without row of long yellow setae, sometimes with several short setae ( Figs 14, 16–18 ). If short keel is slightly indicated, then always without setae on posterior margin. Median lobe slightly curved upwards (in lateral view) (Figs 35, 43, 47, 51). .................. 4

3 Pseudopleural margin fine, but complete, running along elytral edge ( Fig. 19 ). Anterior margin of clypeus slightly sinuate ( Fig. 7 ). Body less convex (in lateral view). .............. ........................................................................................................ H. carinatus sp. nov.

– Pseudopleural margin incomplete, running from humeral angles obliquely downwards towards apex of elytra below the elytral edge, obsolete in apical third of elytral length and then continuing around apex of elytra ( Fig. 21 ). Anterior margin of clypeus strongly sinuate ( Fig. 9 ). Body more convex (in lateral view). ................. H. nogedensis sp. nov.

4 Pseudopleural margin complete, strongly developed, nearly costate ( Fig. 20 ). Elytra with straight and strongly convex interstriae ( Fig. 2 ). Sides of elytra nearly subparallel. ........ .............................................................................................. H. convexicostatus sp. nov.

– Pseudopleural margin incomplete ( Figs 22, 23 ); if sometimes complete, then only slightly indicated. Elytra smooth or sculptured, but never with straight strongly convex interstriae. ................................................................................................................................... 5

5 Elytra with moderately convex, longitudinally plicate interstriae with four regularly zigzag striae on each elytron ( Fig. 4 ). Meso- and metaventrite together with abdominal ventrites I and II distinctly gibbous in both males and females. ...................................................... ................................................................................... H. plicatipennis Waterhouse, 1881

– Elytra usually smooth, if sculptured then at most somewhat irregularly plicate or with short, slightly indicated transverse wavy line along elytral edge ( Figs 5 , 25–27 ). Meso- and metaventrite, abdominal ventrites I and II slightly convex in females, or at most slightly flattened in males. ..................................................................... H. plicatus Kraatz, 1865

Figures

Figs 7–27. 7–12 – head in dorsal view. 13–18 – profemur in ventral view; white arrows indicate keeled anterior margin. 19–24 – pseudopleural margin in lateral view; ee – edge of elytra; pem – pseudopleural margin. 25–27 – elytral surface variability. 7, 13, 19 – Histeromorphus carinatus sp. nov., holotype; 8, 14, 20 – H. convexicostatus sp. nov., holotype; 9, 15, 21 – H. nogedensis sp. nov., holotype; 10, 16, 22 – H. plicatipennis Waterhouse, 1881; 11, 17, 23, 25–27 – H. plicatus Kraatz, 1865; 12, 18, 24 – H. undatus Gahan, 1900.

Figs 1–6. Habitus of Histeromorphus in dorsal view. 1 – H. carinatus sp. nov., holotype; 2 – H. convexicostatus sp. nov., holotype; 3 – H. nogedensis sp. nov., holotype; 4 – H. plicatipennis Waterhouse, 1881; 5 – H. plicatus Kraatz, 1865; 6 – H. undatus Gahan, 1900. Scale bar = 5 mm.