6. Coeliccia hayashii Phan & Kompier, 2016

(Figs 14c, 16c, 17c, 18 a–b, 19c, 20b, 22c, 28b–c)

Specimens examined. 1 ♂, 1 ♀ (in tandem), K’Bang District, Gia Lai Prov. (appr. 14.174N, 108.633E; alt. 710 m asl.), 13 v 2017, TK leg.

Description of female. Head (Fig. 14c). Labrum shiny black, base of mandibles bluish white, anteclypeus bluish white with two blackish spots on its lower margin. Postclypeus shiny black. Genae pale yellow, the yellow con-

tinuing a quarter inward over the antefrons above the postclypeus, remainder of frons matte black. Dorsal surface of head matte black, apart from a broad pale yellow band between median and lateral ocelli, lateral ocelli and antennae, and thinner from antennae to edge of compound eye. Two oblong blue postocular spots. Antennae black, first segment and base of second segment pale grey. Compound eyes in life blackish brown dorsally, mint green below.

Thorax. Prothorax (Figs 16c, 17c, 18 a–b): black with large round yellow mark on either side on middle pronotal lobe, lower edge of middle pronotal lobe with black line not quite completely encircling yellow mark anteriorly. Propleuron yellow. The posterior pronotal lobe (Fig. 18 a–b) spectacular, central part expanding from base into two pointed arms directed outward and upward (Fig. 18a), posterior margin between these arms smoothly convex in dorsal view (Fig. 18b). Lapels small. Synthorax (Figs 19c, 20b, 28b): mesepisternum black, with a distinct bluish white antehumeral stripe along almost its complete length. Mesepimeron and mesinfraepisternum black. Metepisternum yellow, but black line over metapleural suture. Metepimeron and metinfraepisternum yellow. Legs: coxae and trochanters yellow. Femur grey with black lines, remainder, claws and spines dark grey.

Wings. Hyaline, 19–20 Px in FW, 18 in HW. Pt brown, covering 1.5 cells.

Abdomen (Fig. 28c). S1 yellow with posterior margin and dorsum narrowly black; S2 black dorsally and pale below, with apical black ring; S3–7 black, with S3–4 with blue basal annulus, and paler below, but apical margin black; S8 yellow, but lateral and dorsal basal half black; S9 yellow with small lateral black mark at apical margin; S10 black.

Anal appendages (Fig. 22c). Cerci black, half as long as S10, ovipositor black, extending the length of S10 beyond S10, with dorso-apical pale spot.

Measurements (in mm). HW 30; abdomen incl. appendages 45.

Differential diagnosis. Although the general structure of the posterior pronotal lobe of the prothorax of C. hayashii is similar to that of C. coronata, C. diomedea, C. duytan and C. lecongcoi, the combination of a rounded outline of the posterior edge and the two elongated lateral extensions (‘wings’) raised at over 45 degrees separates it from these, except from C. duytan (Fig. 18; Phan 2017, 2019). The female of C. duytan illustrated in Phan (2017: Fig. 3 c–d) has a prominent lower cervical spur as defined by Dow (2016). This spur is not prominent in C. hayashii (Figs 16c, 17c) and possibly may serve to separate these species. Coeliccia duytan may generally be smaller than C. hayashii (the female C. duytan in Phan (2017) has abdomen length of only 35 mm against 45 mm in our specimen of C. hayashii), but the scarcity of specimens precludes a definite statement on the importance of this difference. Color differences between the females of both species are minimal.