Megymenum sumatranum, Kocorek & Lis, 2008

Megymenum sumatranum View in CoL n. sp.

(Figs. 1-4, 11-13)

ETYMOLOGY The name of this new species refers to its type locality.

DIAGNOSIS The new species is very similar to M. basale WALKER and M. dohrni J.A. LIS in its body outline and sculpture, but can easily be separated from both these species by the characters presented in the Table.

DESCRIPTION

Body elongate, abdomen clearly broader than pronotum (Fig. 1). Dorsal side of the body brown, membrane light brown.

Head weakly punctured; paraclypei deeply concave and much longer than clypeus (Fig. 2); preocular part swollen; eyes rounded, protruding and pedunculate, light-brown; ocullar index 4.2-4.4; ocelli of the same colour as head, interocellar distance (a distance of ocellus from eye to a distance between ocelli) 1.45-1.55; antennae 4-segmented, 1 st segment short, not reaching the apex of head, 2 nd very long and broad, 3 rd and 4 th segments missing; rostrum light brown, reaching mid-coxae, its 1 st segment extending beyond the base of head, bucculae lobed, buccular surface convex and rugose, almost same coloured as head.

Table. Characters separating M. sumatranum from M. basale and M. dohrni . View Table Characters M. sumatranum M. basale M. dohrni head colour brown with metallic tinge black and mat black and mat dorsal head surface clearly concave almost flat almost flat lateral margins of head broadened anteriorly (Fig. 2) almost parallel (Fig. 5) almost parallel (Fig. 8) ocular index 4.2-4.4 5.0-5.1 4.3-4.5 interocellar distance 1.45-1.55 1.20-1.25 1.30-1.40 2nd antennal segment medially thickened flat flat pronotum anterior median tuberosity strongly swollen, lateral margins as in Fig. 3 antero-median tuberosity slightly swollen, lateral margins as in Fig. 6 anterior median tuberosity strongly swollen, lateral margins as in Fig. 9 apical projection of lateral margin of sternum thorn-shaped, long, narrow and apically recurved posterad (Fig. 4) pyramid-shaped, short, broad and rounded at apex (Fig. 7) pyramid-shaped, longer, broad and more or less sharpened at apex (Fig. 10) male genital capsule ventral margin with small median swollen process (Fig. 11) ventral margin with distinct incision (Fig. 14) ventral margin with distinct median swollen process (Fig. 17) paramere hypophysis small with a triangle growth (Fig. 12) hypophysis broad with small incision before apex (Fig. 15) hypophysis elongate and narrowing toward apex, its central part swollen (Fig. 18) anterior part of ejaculatory reservoir strongly coiled (Fig. 13) coiled (Fig. 16) straight (Fig. 19)

Pronotum (Fig. 3) with numerous fine ridges, and puncture-like spots; anterior border drawn forward to form a collar-like structure behind base of head, its antero-lateral angles with small sharp spines; antero-lateral pronotal margins projecting forward to form big and sharp processes; antero-median tuberosity large and conspicuous with two small depressions present right behind its posterior border; lateral pronotal margins irregularly rugged with one clearly visible sharply pointed projection at its mid-length, and the second small, sometimes hardly visible, anteriorly to the former; posterior pronotal angles broadly rounded; posterior pronotal margin straight at the base of scutellum.

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

Scutellum with puncture-like spots dispersed over its entire surface; cavity-like depressions present at basal angles.

Corium (Fig. 1) shorter than scutellum, membrane not extending beyond the abdomen, creamy white with brownish irregular patches.

Legs uniformly coloured, under surface of femora with eight small spines (more or less distinct) arranged in two rows, hind tibia of female slightly dilated.

Abdominal sterna of the same colour as remaining parts of the body, sparsely punctured; lateral parts of sterna uncovered by hemelytra; each sternum laterally with large posteriorly recurved apical projection and small median lobe (Fig. 4).

Male genital capsule (Fig. 11) with swollen median process on its ventral rim; paramere with small hypophysis, its general shape as in Fig. 12; anterior part of ejaculatory reservoir strongly coiled (Fig. 13).

Measurements (in mm, males only): total body length 15.3-15.4; abdominal width 8.3-8.8; head length 2.6-2.8; head width 3.0-3.1; inerocellar distance 1.45-1.55; antennal segments: I 0.9-1.0, II 2.6-2.7, III missing, IV missing; pronotal length 3.9-4.4; pronotal width 7.0; scutellum length 3.7-4.1; scutellum width 3.8-3.9.

TYPE MATERIAL

Holotype male: N.O Sumatra; Dr. B. Hagen; tusschen Serdang en het Toba-meer ; Brit. Mus. 1980; 252. Megymenum basale det. PSS Durai, 1978 ( BMNH) .

Paratype male: N.O. Sumatra; Dr. B. Hagen; Tandjong Morawa , Serdang; Brit. Mus. 1980 252; Megymenum basale det. PSS Durai, 1978 ( BMNH) .