dejeani -group

The dejeani -group contains two species: P. dejeani Eschscholtz and P. chalceres Andrewes.

The dejeani -group distributes in southeast Asia, including south Chinese continent, Taiwan Island, Indo-China Peninsula, northeastern India, Malay Peninsula, the Philippines, Borneo, Java, and Sumatra (Fig. 64).

The diagnostic characters of this species group are: Pronotum with a pair of ivory callosities on each side; elytral dark purplish, without pattern; tergum and sternum VII dark, with yellowish patch on each side (Fig. 47); elytral apex strongly curved; third interval with only two setigerous pores; terminal labial palpomeres tubiform in both sexes (Fig. 60); male mesotarsus with adhesive hairs rudimentary on the first two tarsomeres; males with one pair of setae on sternum VII. Aedeagus stout and straight, apical lamella very small; internal sac with main flagellum thick, reaching apical orifice; trumpet-form expansion large, length 0.4–0.45 times of the main flagellum; secondary flagellum and apical bursa absent (Figs. 37, 38).

These two species are doubtless closest in this genus. They seems to be relatively distant from other species groups for these following unique characters: (1) Male terminal labial palpomeres tubiform (securiform in other species groups); (2) elytral apex strongly curved (truncated in other species groups); (3) males with only one pair of setae on sternum VII (with two pairs in other species groups); (4) aedeagal secondary flagellum absent (present in other species groups); (5) apical segment of ovipositor slenderer than other species groups, length about 4 times as basal width (membranous extension excluded); length 2.5–3.4 times as basal width in other species groups (Fig. 54–57).