Callilanguria weiweii Huang & Yang, sp. nov.

Figs. 13–35

Type material. Holotype: male (IZCAS): “ Malaysia: Sabah, Keningau, Borneo Jungle Girl Camp \ 5°26'55"N, 116°27'08"E, 1100 m, 29. IV. 2015, coll. Huang Zhengzhong \ HOLOTYPE \ Callilanguria weiweii sp. nov. Huang Z.Z. det.” Paratypes: 1 male, 1 female, (MNHN); 1 male, 1 female (IZCAS), same data as holotype.

Diagnosis. The new species can be separated easily from the others of Callilanguria by the following characteristics: vertex orange, surrounded by black color; club of antenna composed of the last five antennomeres; base of femur orange, remainder copper green or black; elytra truncated, outer angle acute and a little produced. It is similar to C. luzonica but smaller, and the head and abdomen are not dark.

Description. Body length: 13.1–15.5 mm. Vertex orange, surrounded by black. Genae black, gular plate orange. Antenna and scutellar shield black. Prothorax orange. Elytra copper green with metallic luster. Base of femur orange, remainder nearly black. Ventral side orange-yellow.

Club composed of the last five antennomeres (Figs. 28A, E), fringed with pubescence. Antennomere III longer than antennomere IV, antennomere V as long as antennomere VI, antennomere VII triangular and not very dilated, antennomeres VIII to XI dilated, apex of antennomere XI truncated. Head without punctation or setae, very smooth. Clypeus broader than it is long, sparsely and finely punctured. Apex of labrum with setae. Eyes large, finely faceted. Mandibles robust and triangular. Mandibular incisor bidentate, ventral condyle round and distinct. Apex of lacinia tridentate, not obvious; the lateral edge of lacinia with setae, the left maxilla of the male specimen was damaged during dissecting (Fig. 27D). The last maxillary palpomere longer than the others (Figs. 27D, H). The last labial palpomere flat, length almost equal to width (Figs. 27C, G).

Pronotum convex, longer than broad, lateral sides round, lateral pronotal carina inconspicuous, invisible from dorsal view. Pronotum finely punctured, but with several coarse punctures before the basal margin, without basal fovea. Anterior angle round, posterior angle acute but not produced. Prosternum finely punctured and plicated, with yellowish setae. Prosternal process long and trapezoidal, without any setae, apex broad and straight.

Scutellar shield pentagonal, apex acute (Figs. 28C, G). Elytral humeri a little broader than base of pronotum. Elytra tapering posteriorly from humeri, regularly striate-punctate, striae fading before the apex. Intervals with fine punctation. Apex of elytra truncated, sutural angle round, outer angle acute and a little produced.

Mesoventrite coarsely and densely punctured. The median suture of metaventrite not reaching apex of metaventral process. Abdomen finely punctured, coxal lines absent. The last ventrite with dense black setae at the apex.

Sexual dimorphism. Antenna and the shape of scutellar shield display no differences between sexes, but in male, mandibles symmetric (Fig. 27A); apex of labrum with setae, the setae short and more or less curly (Fig. 27B); profemur and mesofemur densely granulated at base (Fig. 28B); elytra not very dehiscent at apex (Fig. 28D). In female, mandibles asymmetric (Fig. 27E); apex of labrum with setae, the setae long and straight (Fig. 27F); profemur and mesofemur not granulated (Fig. 28F); elytra dehiscent at the apex (Fig. 28H).

Male terminalia (Figs. 15–20). Tergite VIII broader than long, apex with some setae (Fig. 15). Apex of tergite IX rounded with dense setae (Fig. 16). Male genital segment with setae at apex (Fig. 17). Median lobe long and slender, slightly curved, apex of the penis truncated; internal sac with a well-developed flagellum (Fig. 19). Parameres black and slender, apex with long yellow setae (Fig. 20).

Female terminalia (Figs. 23–26). Tergite VIII broader than long, apex with some setae (Fig. 23). Apex of tergite IX tapered, with dense setae, a “V” shaped groove is obvious (Fig. 24). Spermathecal capsule slender (Fig. 25). Ovipositor long, apex strongly sclerotized and acute, apex without stylus but with several indistinct setae (Fig. 26).

Etymology. The specific epithet refers to Mr. Zhang Weiwei from China for his kind help during the field investigation and in honor of his great contributions to the popularization of entomological science in China.

Host plant. Poaceae: Setaria palmifolia (J. Koenig) Stapf. (Fig. 29). It is a native species occurring all over Malesia (Saw et al. 2016). We observed that the females of C. weiweii bit the stem of the host plant and laid eggs inside (Figs. 30–32), and the second author found the eggs and larvae within the stem of the host plant (Figs. 33– 35).