Therates yunnanensis Wiesner and Xiong, 2024

Therates yunnanensis Wiesner and Xiong , new species

( Fig. 1 – 7 View Figures 1–7 )

Type status. Holotype male, type labels: “ Yingjiang County, Dehong Dai and Jingpo Autonomous Prefecture , Yunnan Province, China / Altitude: 800m / Leg. Shaoxing Chen, 2024-IV-5 // HOLOTYPE / Therates / yunnanensis / Det. J. Wiesner & X. Xiong (printed, red)”, as long term loan of SWFU in coll. Xiong

Distribution. China, Yunnan: Yingjiang County.

Etymology. The new species is named for the Chinese province from which it was collected.

Diagnosis. Therates yunnanensis new species is similar to T. montaneus Werner, 1992 , from which it is distinguished by the pale dot on the labrum, the shape of the humeral lunule, and the shape of the aedeagus.

Description. Total length (without labrum) 7.2 mm. Head: Shining greenish black. Mandibles yellowish, teeth brownish marginally. Labrum ( Fig. 4 View Figures 1–7 ) as wide as long, brown to black-brown with large whitish area in the marginal half, with six small apical teeth and one lateral tooth. Maxillary palpi brownish, labial palpi yellowish with darker color at distal end. Antennae lanceolate, extending posteriorly behind elytral shoulders, scape with a single apical bristle, yellowish above, black on underside, antennomeres two to basal half of five glabrous and blackish, apical half of five to eleven finely and evenly pubescent, black-brown, distal antennomeres slightly broader. Clypeus glabrous. Frons smooth with some wrinkles in the front part of the orbital plates. Thorax: Pronotum shining greenish black, barely longer than wide, constricted in front and at back, transverse furrows strong, middle line and lateral lines nearly obsolete. Elytra: shining brownish black, transparent brownish at apex, with basal and apical humps, with several setae around the basal hump, distinctly punctate in front, punctuation shallower in apical third, nearly absent near the apical humps. Some of the punctures are connected in short rows, especially behind the basal humps and near the middle suture ( Fig. 6 View Figures 1–7 ). Apex with sutural corner, rounded laterally or with tiny lateral edge, recurved in between. Maculation brownish yellow, humeral lunule and basal dot merged and connected throughout, central dot subsquare and acutely angled inwards towards the front ( Fig. 7 View Figures 1–7 ). Ventral aspect: Venter black, abdominal segment six somewhat translucent. Femora ochre-yellow; pro- and mesotibiae yellow and darkened; pro- and mesotarsomeres yellow and apically darkened; basal half of metatibiae black, apical half light yellow; metatarsi light yellow, apical two tarsomeres dark.

Aedeagus: total length 1.7 mm, curved, with pin shaped and produced tip ( Fig. 5 View Figures 1–7 ). Female unknown.

Key to the Chinese members of the chennelli group The key of Wiesner (2016) is revised to include all the presently known species.

1. Elytral maculation lacking humeral lunule........................ T. tanjuanjieae Wiesner and Bi

— Humeral lunule present.................................................................... 2

2(1). Elytral maculae variably connected throughout............ T. pseudoconfluens Sawada and Wiesner

— Elytral maculae isolated, or at most humeral lunule and basal dot or humeral lunule connected with central dot........................................................................... 3

3(2). Humeral lunule short, not extended onto disk......... T. pseudorugifer pentalabiodentatus Matalin

— Humeral lunule long, extended onto disk..................................................... 4

4(3). Central dot subsquare or a trapezoidal band.................................................. 5

— Central dot roundish, not forming a band.................................................... 6

5(4). Humeral lunule small, basal dot lacking................................... T. montaneus Werner View in CoL

— Humeral lunate broad, completely connected with the basal dot............................................................................ T. yunnanensis Wiesner and Xiong , new species

6(4). Elytral apex with a yellow dot.............................................................. 7

— Elytral apex transparent brownish................................... T. guangdongensis Wiesner

7(6). Humeral lunule short...................................................... T. probsti Wiesner

— Humeral lunule long, nearly reaching the central dot........................... T. turnai Wiesner