Xylosandrus eupatorii

Xylosandrus eupatorii (Eggers, 1940) Fig. 3 Xyleborus eupatorii Eggers, 1940: 140. Xylosandrus eupatorii (Eggers): Schedl 1964: 213. Material examined. 1 male: Lao P.D. R, Nam Ha National Biodiversity Conservation Area, Muang Sing, Luang Namtha province, Northern Lao P.D. R, 21.126178N, 101.243714E, 995 m alt., 14. ix. 2023, insecticide spray (B. Chouangthavy, leg; NUOL). Male diagnosis. Frons strongly convex, weakly punctate; punctures each bearing erect hair-like seta; eyes with upper part smaller than lower part; anterior margin of pronotum without serrations; elytral disc humped, strongly curved toward declivity, without granulates, finely punctate; declivital face with large strial punctures; each of interstriae with erect hair-like setae; posterolateral margins of elytra carinate; aedeagus short and wide; penis body wide at the base, vase-shaped, gradually extending to a broader middle and narrowed towards apex (Fig 6A). Description of male. body small, 1.4 mm long (n = 1), 0.7 times longer than wide. Pronotum and elytra light brown. Head. Epistoma not divided, transverse, with hair-like setae, with smooth surface. Frons strongly convex, weakly punctate; punctures each bearing an erect hair-like seta, both punctures and setae yellowish brown. Eyes somewhat strongly emarginate (approximately 0.09-0.1 mm), upper part smaller than lower part. Submentum large, distinctly triangular, slightly impressed. Antennal scape long, normal thick and bent, as long as club. Pedicel thick, as wide as scape. Antennal club as in female, combined length of the funicular segments about 2 times as long as scape, 4 th segment of funicle fused with antennal club. Pronotum 0.6 mm, as long as wide, rounded in dorsal view (type 1). Pronotal disc punctate, side slightly curved in basal towards apex, summit at middle, with asperities weak on anterior 1/2. Lateral sides of disc as short or slightly equal anterior slope, basic type 0, flat, slightly curved toward the summit, summit at basal 1/2; anterior margin without serrations, anterior slope weakly asperate, asperities widely spaced, flat, lower toward the summit. Scutellum triangular, large, U-shaped, at same level as surrounding elytral surface. Elytra 0.8 mm as long as wide 0.6; sides feebly convex on basal 1/3, then curving toward apex. Base slightly curved, humeral angles rounded, lateral side curving from humeral angle to apex. Disc short, in lateral view humped, apex rounded; striae and interstriae smooth, apical 3/4 humped and connecting to declivity, feebly convex toward apex, with few small punctures, punctures fine and rarely setose. Declivital commencing from basal third, steep; posterolateral margins strongly carinate to interstriae 7; striae and interstriae confused on the posterior half of elytra and declivity, each puncture becoming obsolete on declivity towards apex, rarely with short or long fine hair-like setae. Legs. Procoxae widely separated, interspace between procoxae 0.03 times as wide as procoxa. Protibiae obliquely triangular, with five socketed teeth on lateral margin; posterior face smooth; mesotibiae with eight socketed teeth; metatibiae with 10 socketed teeth. Genitalia. Aedeagus short and wide; penis body vase-shaped, wide at the base, gradually extending to a broader middle and narrowed towards apex; apodeme thick and curved, resembling the shape of forceps. Distribution in Lao P.D.R: Luang Namtha province Biological notes: This species both male and female collected the same habitat environment and host plant species of X. derupteterminatus. Previously, female of this species had only been recorded on Eupatorium (Asteraceae) according to Eggers (1940). In the present study, we identified additional host plant species for X. derupteterminatus, collected from Pometia pinnata (Sapindaceae).