Ceresium solidum, Yokoi, 2019

Ceresium solidum View in CoL sp. nov.

Figs 3, 15A- I

Types. Holotype Ƌ: “PHIL.VII.95, N-Luzon” ( ZSM) . – Paratype: 1 Ƌ, ditto ( ZSM) .

Diagnosis. Medium sized; with long and stout antennae, stout in body structure with thick elytral surface. Brownish to black.

Etymology. The name refers to the stout body structure.

Description

Measurements. TL = 18.0- 18.2 mm; EL/EW = 2.3- 2.33 (M 2.34); HW/PW = 0.81-0.85 (M 0.83); PL/ PW = 1.02-1.04 (M 1.03); PA/PW =0.79-0.8 (M 0.8); PB/PW=0.96.

Colour. Dark brown to blackish. Elytron widely testaceous except base and apex. Femora and tibiae also widely testaceous except basal and apical parts. Antennae more or less paler except blackish apices.

Head. Distinctly narrower than the maximum width of pronotum, rather shiny, provided with a deep median groove stretching from the middle of frons over vertex to occiput; punctured more or less deeply along the groove. Frons a little shorter than wide; not steep; deeply emarginated on sides by lower eye-lobes; furnished with a deep, arcuate, horizontal furrow near apex; provided with medium-sized punctures near latero-apical corners; sporadically clothed with pale, disorderly recumbent hairs near middle. Clypeus rectangular, five times as wide as long. Eyes separated from one another by 1 / 3 the width of occiput. Vertex distinctly concave. Antennal supports flat and broad, each surrounded by an arcuate line of small punctures. Antennae long and stout, about 7 / 4 times as long as body, surpassing elytral apices by the middle of article 7; article 3 and 5 each about 1 / 5 longer than scape, article 4 about 1 / 10 shorter than scape. Scape moderately arcuate and finely punctured; articles 4-9 distinctly keeled; articles 1-4 clothed with pale, short, recumbent hairs; 5-11 with minute pale hairs.

Pronotum. Slightly longer than wide. Base wider than apex. Sides moderately arcuate, weakly constricted near base. Disc distinctly convex, though weakly impressed in horseshoe form in middle; shiny; densely provided with coarse punctures of varying sizes in the middle; more finely so near sides; clothed with pale, disorderly, recumbent hairs on sides.

Scutellum naked, large and trapezoidal.

Elytra. Short and broad; less than twice as long as head and pronotum combined; well convex, though a little impressed near base. Sides gradually tapering toward separately rounded apices. Surface thick, densely furnished with setiferous punctures each bearing a pale, short, recumbent hair; punctures gradually reducing in size toward apices.

Venter. Prosternum provided with large and coarse punctures as well as with pale recumbent hairs, though nitid near apex. Prosternal process moderately broad, a little emarginated on the apex. Mesosternum furnished with several large, shallow punctures in middle and with pale, short hairs near sides. Mesosternal process short and broad, bi-lobed in apical third.Metasternum well convex, punctured coarsely near middle and clothed with pale, moderately long, recumbent hairs near sides.

Abdomen rather shiny; clothed with pale lying hairs, more densely so near sides. 5 th visible sternite distinctly narrowed towards apex, which is rounded and slightly emarginated in the middle.

Legs. Stout, hind femora almost reaching elytral apex.Femora fairly clavate, clothed sporadically with pale recumbent hairs; tibiae and tarsi clothed with short erect hairs; 1 st article of hind tarsus nearly as long as 2 nd and 3 rd combined.

Genital organs as in Fig. 15A- I. Median lobe more than 1 / 3 the length of abdomen; fusiform in dorsal view; in profile strongly arcuate with the highest point near middle; dorsal plate with a moderate projection at apex, dehiscent in basal 5 / 8; ventral plate distinctly longer than dorsal plate, dehiscent in basal 3 / 4; median struts rather broad.Tegmen almost 5 / 6 the length of median lobe; parameres about 2 / 5 the length of tegmen, dehiscent in apical half, with each lobe gradually narrowed to apex which is rounded and furnished with short to medium setae. Ejaculatory duct complex as in Fig. 15F- H; basal sclerite large, flat, thick, with a projection on apex; both lateral sclerites stout and largely hooked; ejaculatory duct itself relatively large. 8 th sternite broadly bi-lobed, narrowly and sharply emarginated near the apical middle; with a stout peduncle; widely thinned in middle; clothed with several short to long, stout setae along apical margin. 8 th tergite much larger than the corresponding sternite, apicad trapezoidal; clothed with short to long, stout setae on apex and sides.

Distribution. Northern Luzon, Philippines.

Comparative notes. With short, stout body and long, stout antennae, this new species differs from all the other species of the genus Ceresium . In this regard, it resembles rather more those species of the neighbouring genus Examnes Pascoe, 1869 , in particular, the nominotypical E. philippensis Newman, 1842 . Its frons is, however, neither short nor steep, and its antennal supports are very flat without any tubercle, both in contrast to the definition of Examnes ( Pascoe 1869) . The new species must be thus placed in the genus Ceresium , at least for the moment.

Remarks. Holotype was found among “indet.” specimens in “Hüdepohl Collection” (ZSM).