Petersenidia leleji 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 : 40-41

27b. Petersenidia leleji Williams , sp. nov.

( Figs 143–144 )

Diagnosis. FEMALE. The following combination of characters is diagnostic: humeral angle weakly produced, pronotum broader than propodeum, mesosoma uniform orange, legs partly orange, metasoma entirely black, T2 sculpture weak, T2 disc spots small and separated by ~3 × spot diameter, T2 with sparse white apical fringe, T3 band entire, and pygidium smooth. Body length 5.4 mm. MALE. Unknown.

Description. FEMALE. Body length 5.4 mm. Coloration. Head black, except antennal tubercle, mandible, scape, and clypeus largely red-brown, and venter of flagellum largely orange-brown. Mesosoma, coxae, and femoral bases orange-brown, femoral apices, tibiae, and tarsi blackish. Metasoma black, except T1, S1, and T6 largely red-brown. Body setae generally sparse and silvery, except frons, vertex, and mesosomal dorsum with suberect blackish and red-brown setae; T2 disc, T4, and T5 setae dense black; and T2 disc lateral spots, T3 entirely, and T6 basal tuft with dense whitish-silver setae; T2 lateral spot diameter 0.3 × distance between spots, T2 with sparse apical fringe of pale silvery setae, and T3 band entire. Head. Width behind eye 0.9 × mesosoma width. Frons, vertex, and gena punctures dense to confluent. Mandible apex apparently unidentate. Clypeus apically bidentate, teeth connected by transverse carina; basomedial portion with robust tubercle. Antennal scrobe with arcuate dorsal carina and straight lateral carina. Antennal tubercle with scattered micropunctures. Genal carina weak, forming small tooth at hypostomal carina and extending posteriorly to occipital carina. F1 2.0 × pedicel length, F2 1.5 × pedicel length. Mesosoma. Length subequal to width. Dorsum of mesosoma with coarse confluent punctures; obscure 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 weak, complete. Ratio of width of humeral angle, anterior spiracle, narrowest point of mesonotum, propodeal spiracle, and midpoint of propodeum 70:78:70:72:73. Scutellar scale rounded posteriorly, ~2 punctures wide. Posterior propodeal face reticulate with many interspaces obliterated leaving apparent striae. Lateral and posterior propodeal faces separated by wavy carina with few short teeth. Metatibio-tarsal ratio 58:24:13:10:9:10. Metasoma. T1 anterior face with sparse punctures, posterior with confluent punctures. T2 disc with moderate separated pits, interspaces micropunctate and setose; with obscure transverse depression in apical half. T3–5 and S3–5 with small dense punctures. S1 with simple longitudinal lamella. S2 with sparse punctures, interspaces smooth. T2 felt line 0.3 × T2 total length. T6 with long sub-ovate pygidium, widest medially with lateral carina obliterated in posterior half; smooth throughout. S6 posterior margin truncate.

Material examined. Holotype ♀, THAILAND, Phatthalung, 2.4 km S Ban Na, Farm , 7.543 o N 99.883 o E, 50 m, 6.IV.2017, MKT (CSCA). Paratypes (22 ♀), THAILAND, Chiang Mai, Doi Ang Khang , 1300 m, 21.VIII.1998 (1♀ SKYC) . VIETNAM: Vinh Phu, Tam Dao , forest, 10–15.XI.1990, S. Belokobylskij (5♀ ZISP, IBSS) ; Ha Son Binh: Da Bac, Tuly , fores, 22–23.X.1990, S. Belokobylskij (2♀ ZISP) ; Mai Chou , forest, 3. XI.1 990, S. Belokobylskij (12♀ ZISP) ; Hoa Binh, Mai Chau, Pa Co Xa Linh , 20°44'N 104°55'E, 1120 m, 22–24.IV.2002, S. Belokobylskij (1♀ ZISP) ; Quang Ninh, Baitu Long Islands, Dong Ho Il. , 20.III.1987, V. Kuznetsov (1♀ IBSS) .

Distribution. Thailand (Chiang Mai, Phatthalung), Vietnam (Ha Son Binh, Hoa Binh, Quang Ninh, Vinh Phu).

Etymology. KAW is happy to name this species for his co-author and friend, Arkady Lelej, for his contributions to this and many other mutillid research projects.

Remarks. In Chen’s (1957) key, this species terminates at couplet 7 of the Smicromyrme key, because the pygidium is smooth and the S1 carina is entire. In Mickel’s (1935) key, it terminates at couplet 9 because the antenna is largely orange-brown and the genal punctures are moderately large.

Figures

FIGURES 137–146. Mutillinae: Trogaspidiini females III. 137–138. Orientidia manleyi, sp. nov.; 139–140. O. thoawanae, sp. nov.; 141–142. Petersenidia modkhong, sp. nov.; 143–144. Petersenidia leleji, sp. nov.; 145–146. Promecidia ninnii. 137, 139, 141, 143, 145. Habitus, dorsal view; 138, 140, 142, 144, 146. Habitus, lateral view.