Megymenum megaspinosum, Kocorek, 2000

Megymenum megaspinosum View in CoL n. sp.

ETYMOLOGY

The name of the new species refers to its very big processes (spines) of pronotum and connexivum.

DIAGNOSIS

Megymenum megaspinosum is clearly separable from all other species of the genus by its very big and sharp, triangularly shaped spines of connexival segments. It is most similar to M. dohrni LIS , but has different shape of collar­like corners of pronotum (figs.10, 13), and size of projections of abdominal segments (figs 11, 14) and has no preocular spines (figs 9, 12).

DESCRIPTION

Body brownish black with a cupreous metallic tinge (especially pronotal margins, pronotal and scutellum protrusions, and apical connexival segments). Body elongate, abdomen slightly broader than pronotum. Lateral margins of pronotum and abdomen bearing distinct processes.

Head (fig. 12) slightly punctate; paraclypei deeply concave and much longer than clypeus joined in front of it; eyes round, protruding and appear pedunculate, light­brown, ocelli of the same colour as head surface; ocular index 4.3; distance between ocelli about 1.23 times longer than distance between ocellus and eye; antennae 4­segmented, 1 st segment short, not reaching apex of head, 2 nd longest, 3 rd and 4 th subequal, but 3 rd slightly dilated, first three segments including base of 4 th similarly coloured as head, rest yellowish; rostrum light brown, reaching mid­coxae, 1 st segment extending beyond base of head, buccula lobed, anteriorly incised, surface convex and rugose, similarly coloured as head.

Pronotum (fig. 13) generally of same colour as head, with numerous fine ridges, and puncture­like spots; anterior border drawn forwards to form a collar­like structure behind base of head, bearing sharp corners; lateral margins irregularly rugged with one very sharply pointed projection; posterior angles rounded; posterior border straight at base of scutellum, anterior median tuberosity large and conspicuous, two small depressions present below tuberosity.

Scutellum with dispersed puncture­like spots; cavity­like depressions present at basal angles of scutellum.

Hemelytra narrower than abdomen, corium slightly longer than scutellum, membrane not extending beyond abdomen, creamy coloured with brownish patches.

Legs uniformly coloured as rest of body, femora with small spines on undersurface, spines extending in two rows from near apex to base of femora (about 8 spines), hind tibia of female slightly dilated.

Meso­ and metasternum with a deep median groove; scent gland spout large and conspicuous, evaporatoria wrinkled.

Abdomen. Connexivum not covered by hemelytra, well conspicuous; posterior lateral corners of segments with a large pyramid­shape apical projection and smaller median projection (fig. 14); sterna punctate.

Measurements (in mm) (female only): body length 17.21; body width 10.4; head length 3.0; head width 3.25; pronotum length 4.5; pronotum width 9.0; scutellum length 4.6; scutellum width 4.75; antennal segments: 1.0:2.5:1.95:1.55.

TYPE MATERIAL

Holotype female: [Sumatra]: Indrapura ­ Estate. Ost Sumatra; Gebr. SIEMSSEN leg. IX ­ XII 1893, det. 6 IV 1894, Megymenum basale dohrni J.A. LIS, det B. LIS (preserved in the collection of the Department of Zoology, University of Opole .