[29] Parena (Parena) amamiooshimensis Habu, 1964

Habitus: Fig. 59C. Male genitalia: Fig. 61.

Habu, 1964a: 29 (type locality: Amami-oshima Is., Hatsuno, holotype in NIAES: National Institute for Agro-Environmental Sciences, Japan); Habu, 1967: 156; Habu, 1982: 113.

Type material examined. Parena amamiooshimensis Habu: Paratype: 1 male (NHML), "Paratype" [round label with yellow circle], " Amamiôshi- / ma Is., Kago- / shima Pref. / Japan ", "Paratype / Parena / amamiooshi- mensis Habu " [green label] <Figs 59C, 61 >.

Comparisons. This species is very similar to P. nigrolineata, but its stout male genitalia shows they are distinct. Externally, P. amamiooshimensis differs from P. nigrolineata mainly in having the elytra black stripes obliterated from the apices and background color darker. According to Habu (1967), these differences are valid when determining Japanese species. However, we examined one specimen of P. nigrolineata from Guizhou, China (Fig. 56E) having elytral stripes similar to P. amamiooshimensis, and two specimens of P. nigrolineata from Yunnan having dark reddish brown background similar to P. amamiooshimensis . Thus, distributional information is sometimes necessary when identifying this species.

Description. Body length 8.0– 9.3 mm. Dorsum dark reddish brown, elytra with black lateral stripes, without metallic hue, stripes completely or partly obliterated from intervals 1 to 4 basally and apically; antennae, mouthparts, legs and venter brown. Postgenae without suborbital setae; antennae hardly reaching pronotal base; mentum with a pair of very short median setae. Pronotum rounded-hexagon, PW/PL = 1.43–1.49, slightly wider than head, PW/HW = 1.04–1.08; widest at anterior third, strongly narrowed to base, lightly sinuate before posterior angles; posterior angles widely obtuse. Elytra slightly dilated to apex, surface with very faint isodiametric microsculpture; striae well incised, with fine puncture rows; intervals sparsely punctate; disc with large and shallow depressions near basal third of intervals 3 to 6. Apex of abdominal sternite VII weakly emarginate in males. Median lobe of aedeagus stout, right margin sinuate before apical lamella; apical lamella wide rounded-triangular, LL smaller than LW, apex weakly bent upward in lateral view. Females not studied, but according to Habu (1967) gonocoxite II of ovipositor similar to P. nigrolineata .

Distribution (Map 10, cyan). Only known from the Ryukyu Islands, including Takera Is., Amami Is., Okinawa Is., Tokuno Is. and Ishigaki Is. (Habu, 1967, 1982). It is sympatric with P. nigrolineata .

Remarks. P. amamiooshimensis is a species with the stoutest male genitalia within the P. nigrolineata group, which is somewhat similar to the P. latecincta group. However, the male genitalia of P. amamiooshimensis is different from that of P. latecincta group in the apical lamella (in lateral view) thin and apex slightly bent dorsally. This character well corresponds to other species in the P. nigrolineata group.