Eulomalus rugosus Zhang & Zhou

Zhang, Ye-Jun & Zhou, Hong-Zhang, 2007, Taxonomy of the tribe Paromalini Reitter (Coleoptera: Histeridae, Dendrophilinae) from China, Zootaxa 1544, pp. 1-40 : 23-25

Eulomalus rugosus Zhang & Zhou , n. sp.

(Figs. 123–136)

Type material. Holotype. CHINA: Hainan: male, Diaoluo mountain, 920 m, dead wood, 2004. VII.28, Jie Wu & Yongjie Chen coll.; Paratypes. CHINA: Hainan: 1 female, same data as holotype; 1 male, Wuzhi mountain, 790 m, dead wood, 2004. VII.10, Jie Wu & Yongjie Chen coll.; 1 female, Wuzhi mountain, 762 m, dead wood, 2004. VII.11, Jie Wu & Yongjie Chen coll.

Description. Body length 1.43–1.5 mm, body width 1.01–1.09 mm. Body oblong, moderately convex, black or dark brown, glossy, legs and funicles of antennae rufous, clubs of antennae fulvous.

Head (Fig. 123) surface with even and medium-sized punctures. Frontal stria only present laterally in posterior half, anterior ends terminated above antennal bases.

Pronotum (Fig. 124) with sides arcuate and convergent anteriorly; anterior margin emarginate and bisinuate behind head. Marginal pronotal stria complete, lateral marginal stria carinate and anterior marginal stria not parallel to anterior margin in middle. Surface densely punctate, punctures larger than those of frons, smaller and sparser in posterior median area.

FIGURES 123–136. Eulomalus rugosus Zhang & Zhou , n. sp. 123. Head, frontal view; 124. Pronotum, elytra and propygidium; 125. Female pygidium; 126. Prosternum, meso- and metaventrite, and the first visible abdominal sternum; 127. Protibia, dorsal view; 128–129. Aedeagus, lateral and dorsal views; 130. Apex of aedeagus, ventral view; 131–132. Male 8th tergite, dorsal and lateral views; 133–134. Male 9th and 10th tergites, lateral and dorsal views; 135. Male 8th sternum, ventral view; 136. Male 9th sternum, ventral view. Scale bars: 124, 126 = 0.5 mm; 123, 125, 127–136 = 0.25 mm.

Scutellum not visible in dorsal view.

Elytra (Fig. 124) with sides arcuate. Dorsal striae absent, only an oblique rudiment left in middle of basal 1/3 of elytra; lateral area with another feeble rudement. Surface of elytra with dense and strong punctation, near apex of elytra punctures oblong; basal 1/3 near elytral suture finely punctured, narrow band along elytral suture slightly elevated and impunctate, sometimes with several microscopic punctures; narrow bands along basal and apical margins impunctate. Epipleura smooth and with scattered microscopic punctures; marginal epipleural stria complete but inconspicuous; marginal elytral stria complete and conspicuous, its apical end attaining elytral apex and shortly extending along the apical margin.

Propygidium (Fig. 124) with punctation similar to that of frons, narrow band along anterior margin impunctate. Pygidium with punctation a little finer and denser than that of propygidium; in female (Fig. 125), apical half of pygidium engraved with furrows forming complicated pattern: one long furrow running nearly parallel to margins, and medially several short furrows irregularly crossing each other; sometimes furrows simple.

Prosternal lobe (Fig. 126) with anterior margin broadly rounded; marginal stria present in posterior half and convergent posteriad; surface densely and moderately punctate, medially basal portion densely covered with longitudinal wrinkles. Prosternal keel (Fig. 126) with two carinal striae complete and carinate, shallowly and broadly impressed, feebly bisinuate, not united with each other; posterior margin of keel strongly protruding posteriad; surface with punctures sparser and finer than those of prosternal lobe. Lateral prosternal stria short and strongly carinate.

Mesoventrite (Fig. 126) with anterior margin strongly emarginated medially. Marginal mesoventral stria complete laterally, anterior end curved inwards and posterior end connected with lateral metaventral stria. Surface with scattered fine punctures. Transverse stria with two angles, one longitudinal impression crossing each angle; median part of stria straight and long, lateral parts slightly curved. Meso-metaventral suture weak and nearly straight.

Intercoxal disk of metaventrite (Fig. 126) convex and with scattered fine punctures, becoming denser and larger posteriorly (except in median area). Metaventral longitudinal suture absent. Lateral metaventral stria carinate and crenate, impressed with coarse punctures, extending postero-laterally through anterior 2/3. Lateral disk with scattered large punctures and dense transverse alutaceous microsculptures. Post-mesocoxal stria running along posterior margin of mesocoxa, and then slightly bending posteriad.

Intercoxal disk of the first visible abdominal sternum (Fig. 126) with punctures similar to those in posterior part of intercoxal disk of metaventrite, longitudinal median area convex, with scattered fine punctures. Lateral stria carinate and crenate, impressed with coarse punctures, nearly complete, its anterior end slightly abbreviated.

Protibia (Fig. 127) dilated, its outer margin with four denticles. Outer margin of mesotibia with three spinules. Outer margin of metatibia with one small spinule near apex.

Male genitalia as in Figs. 128–136.

Remarks. This new species can be easily distinguished from all other congeneric species by the presence of longitudinal wrinkles in the middle of the basal portion of the prosternal lobe.

Distribution. China (Hainan).

Etymology. The species epithet is the Latin adjective “ rugosus ” (wrinkle).