Krombeinidia chang Williams, 2019

Williams, Kevin A., Lelej, Arkady S., Okayasu, Juriya, Borkent, Christopher J., Malee, Rufeah, Thoawan, Kodeeyah & Thaochan, Narit, 2019, The female velvet ants (aka modkhong) of southern Thailand (Hymenoptera: Mutillidae), with a key to the genera of southeast Asia, Zootaxa 4602 (1), pp. 1-69 : 35-36

23c. Krombeinidia chang Williams , sp. nov.

( Figs 131–133 )

Diagnosis. FEMALE. The following combination of characters is diagnostic: mesosoma uniform orange-brown, pronotum as broad as propodeum, legs black, metasoma entirely black, T2 sculpture weak, T2 disc spots large and separated by less than spot diameter, pale golden T2 band broad and bilobed, pale golden T3 band entire, and pygidium smooth. Body length 5.4–5.8 mm. MALE. Unknown.

Description. FEMALE. Body length 5.1 mm. Coloration. Head black, except antennal tubercle, clypeus, and mandible partly red-brown. Mesosoma and coxae orange, posterior propodeal face and remainder of legs blackened. Metasoma black, except T1 basally dark red and S1 orange. Body setae generally sparse and silvery, except frons and mesosomal dorsum with interspersed erect silvery and blackish setae; T2 disc, T4, and T5 setae dense black; and vertex, T1 apex, T2 disc lateral spots, T2 apical band, T3 entirely, and T6 basal tuft with dense pale golden setae; T2 lateral spot diameter 1.2 × distance between spots; T2 apical band broadly bilobed and T3 band entire. Head. Width behind eye 1.1 × mesosoma width. Frons, vertex, and gena punctures dense to confluent. Mandible apex apparently unidentate. Clypeus apically bidentate, lateral tooth a broad triangular lamella; basomedial portion with robust tubercle. Antennal scrobe with nearly straight dorsal carina and straight lateral carina. Antennal tubercle with sparse punctures and setae. Genal carina weak, obscured by punctures and setae. F1 2.1 × pedicel length, F2 1.5 × pedicel length. Mesosoma. Length 1.1 × width. Dorsum of mesosoma with coarse confluent punctures; weak interrupted carina separating dorsal and lateral faces of mesonotum. Side of mesosoma with dense micropunctures and short setae. Mesopleural lamella an obscure interrupted carina. Humeral carina simple. Ratio of width of humeral angle, anterior spiracle, narrowest point of mesonotum, propodeal spiracle, and midpoint of propodeum 64:69:63:68:69. Scutellar scale rounded posteriorly, ~3 punctures wide, surrounded by few interconnected tubercles. Posterior propodeal face reticulate with some interspaces reduced, forming short tubercles. Lateral and posterior propodeal faces separated by row of teeth. Metatibio-tarsal ratio 48:19:14:9:8:8. Metasoma. T1 anterior face with separated punctures, posterior with confluent punctures. T2 disc with separated moderate shallow punctures, interspaces densely micropunctate and setose; evenly convex. S2 with separated punctures, denser laterally, interspaces smooth to shagreened. T3–5 and S3–5 with small dense punctures. S1 with longitudinal lamella with raised apparent tooth medially. T2 felt line 0.3 × T2 total length. T6 with long sub-ovate pygidium, widest sub-apically with lateral carina obliterated in posterior third; smooth throughout. S6 posterior margin bidentate.

Material examined. Holotype ♀, THAILAND, Phetchaburi, Kaeng Krachan, Baan Maka Nature Lodge , 12.840 o N 99.590 o E, 140 m, 16.V.2018, MKT (1♀ CSCA) . Paratype (1 female), same locality, 23.V.2018, MKT (1♀ CSCA) .

Distribution. Thailand (Phetchaburi).

Etymology. From the Thai “ ชาง ้, chang ”, elephant, Thailand’s national animal. Treat as a noun in apposition.

Remarks. In sculpture and body shape, this species is more similar to K. agricola than the other Krombeinidia females. In Chen’s (1957) key, this species terminates at couplet 8 of the Smicromyrme key, because the apical T2 band is broad and the S1 carina is bi-interrupted and medially raised. In Mickel’s (1935) key, it terminates at couplet 6 of the Timulla (Trogaspidia) key in having the pygidium smooth and the legs entirely black.

Figures

FIGURES 125–136. Mutillinae: Trogaspidiini females II. 125–127. Krombeinidia meeungensis; 128–130. K. agricola, sp. nov.; 131–133. K. chang, sp. nov.; 134–136. K. baanmaka, sp. nov. 125, 128, 131, 134. Habitus, dorsal view; 126, 129, 132, 135. Habitus, lateral view; 127, 130, 133, 136. Face view.