Agrilus crepuscularis Jendek & Chamorro

Jendek, Eduard & Chamorro, Maria Lourdes, 2012, Six new species of Agrilus Curtis, 1825 (Coleoptera, Buprestidae, Agrilinae) from the Oriental Region related to the emerald ash borer, A. planipennis Fairmaire, 1888 and synonymy of Sarawakita Obenberger, 1924, ZooKeys 239, pp. 71-94 : 72-75

Agrilus crepuscularis Jendek & Chamorro sp. n. Figs 1223

Diagnosis.

This species resembles Agrilus planipennis by the body shape; transverse and trapezoid pronotum; obvious medial pronotal impression; very narrow marginal and submarginal interspace; rounded elytral apices; and by the small scutellum. Agrilus crepuscularis sp. n. can be distinguished from Agrilus planipennis mainly by the missing prehumerus; presence of obvious, yellow pubescence ventrally and by the rounded not spined apex of pygidium.

Description.

BODY: Size: 10 mm (Holotype); Shape: cuneiform; Build: slender.

HEAD: Shape: obviously flat; Medial impression (depth): deep; Medial impression (extent): vertex; Epistoma: with raised upper margin; Frons: Shape: markedly convex; Outline: protruding from head outline; Vertex: Outline: slightly protruding from head outline; Sculpture: punctures, semispherical, dense, rough; Eyes: Size: large; Shape: protruding from head outline; Lower margin: in line with antennal socket; Antennae:Length: moderate; Shape: slender.

PRONOTUM: Shape: visually square; Sides: markedly arcuate; Maximal width: at middle; Anteriormargin: narrower than posterior; Anterior lobe: moderate; Shape: arcuate; Position: at level with anterior pronotal angles; Posterior angles: Apex: blunt, Shape: obtuse; Disk: Convexity: flat, Disk impressions: Presence: medial and lateral, Medial impressions (shape): entire, Medial impressions (depth): deep; Lateral impressions (Depth and width): shallow and broad; Prehumerus: absent; Marginal and submarginal carinae: Interspace: narrow; Convergence: strongly convergent; Junction: present; Scutellum: Size: small, Disk: impressed, Scutellar carina: present.

ELYTRA: Color: unicolored; Humeralcarina absent; Apices: Arrangement: separate; Width: wide. Shape: arcuate.

STERNUM: Prosternum: with long yellow pubescence in males; Prosternal lobe: Size: moderately sized; Anterior margin: arcuately emarginate; Emargination wide and moderately deep; Prosternal process: Shape: dilated; Sides: arcuate; Angles: acute; Disk flat; Metasternal projection: flat.

ABDOMEN: Sternal groove: Shape on apex of last ventrite: arcuate; Pygidium:Apicalmargin: arcuate.

LEGS: Metatarsus: somewhat longer than mesotarsus; Tarsomere1: subequal to or longer than 2-4 combined.

GENITALIA: Aedeagus:Symmetry: symmetrical.

Type locality.

Malaysia, Pahang state, 35 km Southwest Kuala Rompin, 2.617N, 103.337E, Endau Rompin State Park.

Type specimens.

Holotype, ♂, (EJCB): "Malaysia, Pahang, 28. ii– 13.iii, 35 km SW Kuala Rompin, 2.617N, 103.337E, 50 m, Endau Rompin State Park, E. Jendek leg. 2011".

Distribution.

Malaysia: Pahang state.

Etymology.

The specific name is derived from the Latin crepusculum (twilight). It refers to the collecting circumstances with the holotype landing on the sheet when collecting at light.