Ptomaphaginus giachinoi spec. nov.

(figs 5-6).

Type material.— Holotype ♂: Indonesia: Sumatra: Brastagi G. Sibayan, 1200 m. alt., 5.iii.1989 (CPMG).

Diagnosis.— Habitus shortly ovoid. Male with a small central depression on the 5 th, and a large semicircular and slightly depressed plate on the central part of the 6 th visible abdominal sternite, not bordered by long hairs as in burckhardti . This species is characterized by the special morphology of the aedeagus, which has a characteristic narrow apex with two lateral acuminate flaps (figs 5-6).

Description.— Habitus shortly ovoid. General colour dark brown, the apex of elytra and legs somewhat lighter, the antennae light brown, with the 6 th, 7 th, and 8 th articles slightly darker. Length: 2.8 mm. Antennae slender, 1.15 times longer than the width of the head. Male protarsi as wide as the protibia. Pronotum short, 1.8 times as wide as long. Elytra 1.15 times as long (measured from the caudal tip of the scutellum) as their combined width, the sides parallel on the rostral half, and regularly curved on the caudal half. Male with a small central depression on the 5 th, and a large semicircular and slightly depressed plate on the central part of the 6 th visible abdominal sternites. Aedeagus (figs 5-6) wide from the base to the apex of the parameres, the apex parallel, narrow, with two lateral acuminate flaps, each of which carry two dorsal setae. The parameres widened and protruding at their apex. In lateral view, the apex of the aedeagus is bent downward sharply, and carries several thick ventrally-oriented setae, as in P. loeblianus .

Distribution.— The only specimen known is from the type locality, Gunung Sibayan (Sumatra).

Etymology.— Dedicated to Pier Mauro Giachino, famous specialist of the Cholevinae.