Krombeinidia agricola 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 : 34-35

23b. Krombeinidia agricola Williams , sp. nov.

( Figs 128–130 )

Diagnosis. FEMALE. Having the first and third metasomal segments bright orange and having the pygidium shagreened are apparently unique among Krombeinidia species. Other diagnostic features include: pronotum as broad as propodeum, legs black, T2 sculpture weak, T2 disc spots moderate and separated by slightly more than spot diameter, pale golden T2 band narrow and interrupted, and pale golden T3 band entire. Body length 5.6 mm. MALE. Unknown.

Description. FEMALE. Body length 5.6 mm. Coloration. Head black, except mandible with orange patch. Mesosoma, meso-, and metacoxae orange, remainder of legs black. Metasoma black, except T1, S1, T3, and S3 orange. Body setae generally sparse and silvery, except frons and mesosomal dorsum with erect blackish setae; T1 apex, T2 disc, T4, and T5 setae dense black; and T2 disc lateral spots, T2 apical band, T3 entirely, and T6 basal tuft with dense pale golden setae; T2 lateral spot diameter 0.9 × distance between spots; T2 apical band interrupted medially with black setae and T3 band entire. Head. Width behind eye 1.1 × mesosoma width. Frons and vertex punctures coarse confluent; gena punctures coarse, separated, with interspaces dense micropunctate. Mandible apex bidentate, inner tooth large. Clypeus apically with medially-interrupted laterally-downcurved transverse lamella; basomedial portion with broad flat tubercle. Antennal scrobe with arcuate dorsal carina and straight lateral carina. Antennal tubercle with punctures and few transverse ridges. Genal carina distinct and connected posteriorly with occipital carina, obliterated anteriorly. F1 2.4 × pedicel length, F2 1.3 × pedicel length. Mesosoma. Length 1.1 × width. Dorsum of mesosoma with coarse confluent punctures; weak interrupted carina separating dorsal and lateral faces of pronotum and mesonotum. Side of mesosoma with dense micropunctures and short setae. Mesopleural lamella an obscure carina. Humeral carina simple. Ratio of width of humeral angle, anterior spiracle, narrowest point of mesonotum, propodeal spiracle, and midpoint of propodeum 50:54:44:50:49. Scutellar scale rounded posteriorly, ~2 punctures wide, surrounded by few interconnected tubercles. Posterior propodeal face reticulate with some interspaces reduced, forming apparent striae and short tubercles. Lateral and posterior propodeal faces separated by row of teeth. Metatibio-tarsal ratio 50:20:13:10:8:9. Metasoma. T1 anterior face with separated punctures, posterior with confluent punctures. T2 disc with separated moderate shallow punctures, interspaces densely micropunctate and setose; with obscure transverse arcuate depression in apical half. T3–5 and S3–5 with small dense punctures. S1 with blunt anterior tubercle separated from posterior short longitudinal lamella. S2 with separated shallow punctures, interspaces micropunctate and microsetose. T2 felt line 0.4 × T2 total length. T6 with long sub-ovate pygidium, widest sub-apically with lateral carina obliterated in posterior half; shagreened to microreticulate throughout. S6 posterior margin bidentate.

Material examined. Holotype ♀, THAILAND, Kanchanaburi, Thong Pha Phum, Vimarndin farm stay, 14.655 o N 98.521 o E, 200 m, 17–20.V.2018, MKT (CSCA).

Distribution. Thailand (Kanchanaburi).

Etymology. From the Latin agricola , “ farmer”, in reference to the type locality, the Vimarndin organic farm.

Remarks. In Chen’s (1957) key, this species terminates at couplet 12 of the Smicromyrme key, because it has a posterior setal band on T2 but has the S1 carina interrupted. In Mickel’s (1935) key, it terminates at couplet 13 of the Timulla (Trogaspidia) key in having the T2 apical band interrupted and the T3 cuticle orange. In having T3 with orange cuticle and the pygidium shagreened, this species differs from other known Krombeinidia . Molecular studies or discovery of the male might change the genus placement of this species.

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.