Theopea costata (Allard)

(Figs 25, 26)

Ozomena costata Allard, 1889: 111 (Philippines: Mindanao).

Theopea costata: Weise, 1924: 151 (catalogue); Laboissière, 1940: 35 (redescription); Wilcox, 1973: 639 (catalogue); Kimoto, 1990: 233 (catalogue).

Type. Holotype ♂ (IRSB, by monotypus): “ E. Mindanao / Semper [p, y] // Coll. Chapuis [p, w] // M. R. Belg. [p, w] // Ozomena / costata All. [h, w] // Allard det: / Ozomena / costata All. [h, w] // V. Laboissière rev., 1940 [p] / Theopea / costata All. / Type [h, w] // TYPE [p, pink label] // cf. Ann. Soc. Ent. / Belg., [p] XXXIII, 1889, p. 111 [h, w]”.

Other material examined. PHILIPPINES. Mindanao: 1♀ (SEHU), Calinan, 12.II.1979, leg. Y. Komiya.

Redescription. Length 7.0– 7.2 mm, width 2.5 mm. General color (Figs 25A, 25B) reddish brown, but antennomeres III–V darker. Antennae filiform in male, antennomeres III and IV broader (Fig. 26A), length ratios of antennomeres I–VII (VIII–XI lost) 1.0: 0.2: 0.7: 1.0: 0.9: 0.8: 0.8, length to width ratios of antennomeres I–VII 4.1: 1.2: 2.8: 5.3: 5.4: 4.8: 5.5; filiform in females (Fig. 26B), length ratios of antennomeres I–XI 1.0: 0.2: 0.6: 0.8: 0.8: 0.7: 0.7: 0.7: 0.7: 0.6: 0.7, length to width ratios of antennomeres I–XI 4.1: 1.5: 3.4: 4.9: 4.9: 4.9: 5.0: 4.8: 4.8: 4.7: 5.4. Frons with semicircular concave area in males, with one erect median process and two basolateral processes, and few setae on lower surface of median process (Fig. 25C). Elytra elongate and parallel-sided, 1.8x longer than wide; disc with dense, coarse punctures, arranged into longitudinal rows, with one distinct longitudinal ridge between two longitudinal rows of punctures, weak longitudinal ridges staggered with stronger ridges. Tarsomeres I of front legs slightly swollen in males; subparallel in females. Aedeagus (Figs 26 C–26E) extremely slender, 7.6x longer than wide; parallel-sided, subapically strongly narrowed; apex with shallow notch; tectum well sclerotized, basally broadened; slightly curved in lateral view; ventral surface with deep notch from apex to middle, narrow in apical 1/4, abruptly broadened at middle; basal notch open; triangular sclerites large; internal sac with one elongate endophallic sclerite complex, 0.6x as long as aedeagus, apical piece apically narrowed, basal piece a little longer (1.3x) than apical sclerite,. Gonocoxae (Fig. 26G) elongate, widest at apex, both gonocoxae combined together from basal 1/3 to apical 1/4; apices narrowly rounded; both gonocoxae very close; each gonocoxa with eight setae along outer margin from apex to apical 1/5; with one pair of short lateral processes at basal 2/5. Ventrite VIII (Fig. 26F) longitudinal and well sclerotized; disc with several long setae laterally and near apical margin, and with dense, short setae along apical margin; spiculum extremely slender. Receptacle of spermatheca (Fig. 26H) strongly swollen; pump slender and strongly curved; proximal spermathecal duct deeply inserted into receptacle, broad and short.

Diagnosis. Members of this species are characterized by the sexually dimorphic frons and reddish brown bodies.

Distribution. Philippines: Mindanao.