Eumorphus falcifasciatus, Chang, Ling-Xiao & Ren, Guo-Dong, 2017

Chang, Ling-Xiao & Ren, Guo-Dong, 2017, Two new Oriental species of Eumorphus Weber (Coleoptera, Endomychidae), ZooKeys 677, pp. 1-9 : 2-3

Eumorphus falcifasciatus sp. n. Figs 1, 3

Type material.

Holotype, male, Borneo, Sabah, Keningau district, Jungle Girl Camp, 1215 m, 2016-IV-26, Chang L.X. leg (CCLX).

Diagnosis.

Eumorphus falcifasciatus is a very unique species by its colouration, differing from all others in having the anterior elytral maculae falciform and posterior maculae dentate.

Description.

Length 16.1 mm. Body pyriform, approximately 1.9 times as long as wide; moderately convex; subopaque. Colour black brown with two yellow maculae on elytra.

Head. Antenna composed of 11 antennomeres, long, rather stout, nearly 1/2 body length, with antennomeres 1 and 3-8 distinctly longer than wide; scape approximately 5.5 times as long as pedicel; pedicel very short, nearly as long as wide; antennomere 3 longer than 4-5 combined; antennomere 4 as long as 5; antennomeres 5 slightly longer than 6; antennomeres 6-8 subequal in length; club composed of three antennomeres, very broad, approximately 4.0 times as wide as antennomere 8, moderately flat and compact.

Thorax. Pronotum 3.5 mm long, 5.7 mm wide; widest at base; finely, rather densely punctate; lateral and anterior margins narrowly bordered; anterior edge with small stridulatory membrane; sides undulate, abruptly widened basally from 1/4 length; anterior angles produced, rather acute; posterior angles strongly, acutely produced backwards, distinctly curved basally and overlapping most of humeri; disc weakly convex, surface uneven with one large transverse oval raised area posteromedially and two small round raised areas anterolaterally; median furrow absent; lateral sulci shallow, linear, extending to 1/2 pronotal length; basal sulcus weakly sinuate, moderately deep. Prosternal process moderately widely separating the procoxae; gradually widening to apical 1/4, thence abruptly converging towards apex. Mesoventral process nearly quadrate, disc weakly convex, sides subparallel. Elytra 11.8 mm long, 8.3 mm wide; 1.4 times as long as pronotum; 1.5 times as wide as pronotum, sides curved, widest near behind 1/2 length of elytron; lateral flattened margins abruptly widening from basal 1/6 to apex, nearly 1/5 of elytral width; sides distinctly converging from apical 1/3 towards apex; finely, densely punctate; humeri weakly prominent. Each elytron with two large irregular maculae. Anterior elytral macula falciform, occupies about 4/5 of elytral width and 2/3 of elytral length, outer sides touching elytral lateral margin, inner margin of macula placed closely to elytral suture. Posterior macula crown-shaped, located at apical 1/3, its anterior margin tridentate, posterior margin widely emarginate medially. Protibiae slender basally, abruptly widening from basal 1/4 to apex; outer edge strongly sinuate; dorsal edge with S-shaped longitudinal ridge; inner edge with large, sharp tooth near 1/2 length; mesotibiae weakly curved from about 1/3 length to apex; metatibiae simple throughout its length, acutely produced apically.

Abdomen with five ventrites. Ventrite 1 almost as long as three following ventrites combined; ventrites 2-4 subequal in length. Ventrite 5 with lateral margins strongly converging posteriorly, posterior margin deeply, narrowly emarginate medially. Aedeagus (Fig. 3) long, heavily sclerotized, straight. Median lobe hook-shaped at apex, and branched latero-apically; branch rather long and strongly reflexed upwardly. Tegmen basal, comparatively large, ring-shaped.

Etymology.

The name refers to the anterior elytral macula falciform.