Krombeinella brothersi, Williams & Lelej & Thaochan, 2019

Williams, Kevin A., Lelej, Arkady S. & Thaochan, Narit, 2019, New species of Myrmosinae (Hymenoptera: Mutillidae) from Southeastern Asia, Zootaxa 4656 (3), pp. 525-534 : 529

Krombeinella brothersi sp. nov.

( Figs 8–12 , 17–20 )

Diagnosis. Male. This species has unique coloration for the genus, having the pronotum and mesoscutum black and the mesopleuron and propodeum reddish. Additional useful diagnostic features include: body setae predominantly whitish; protrochanter unarmed; forewing colorless except light brown cloud subapically; second submarginal cell sessile with marginal cell; S7 posterior margin truncate; T7 medially concave with distinct tooth laterally, posterior margin truncate; S8 with sublateral process nearly as thick as lateral process, medial process with shallow medial emargination on posterior margin. Body length: 9.5 mm. Female. Unknown.

Description. Holotype male. Length: 9.5 mm. Coloration. Body blackish, except mesopleuron, metapleuron, and propodeum reddish-orange and tegula pale yellow-brown ( Figs 8, 9 ). Body setae pale silvery-white, except T7 setae brown apically. Tibial spurs whitish. Head. Punctures dense, irregular. Eye seta length slightly less than DLO. Clypeus dense punctate and setose, with longitudinal medial carina, ventral margin emarginate medially. Mandible apically quadridentate, dorsal tooth larger than subdorsal and subventral ones. Antennal tubercles connected by transverse carina. Antennal scrobe with dorsal carina. Ocelli small, OOD 4.0 × DLO; IOD 1.3 × DLO. Scape 2.9 × as long as wide, unicarinate. F1 3.0 × pedicel length; F2 3.0 × pedicel length. Mesosoma . Mesosoma areolate, except metapleuron transversely striate dorsally and smooth ventrally. Notauli obscure, about half mesoscutum length; parapsidal lines about two-thirds mesoscutum length. Tegula with uniform punctures. Dorsal and lateral propodeal faces separated by incomplete transverse carina. Legs. Procoxa unarmed, ventrally rounded. Metacoxa with sub-translucent rounded lamella dorsally. Wings. Forewing evenly setose, colorless except light brown subapical cloud, veins brown; three submarginal cells, second submarginal cell narrowly sessile with marginal cell and smaller than third, marginal vein with four abscissae. Metasoma. Tergites dense punctate to tight areolate; posteriorly and laterally with narrow sub-translucent whitish to brownish smooth margin. S1 basomedially with back-curved sharp lamella. S2 basomedially with back-curved tooth. T2 basally with transverse strip of longitudinal striae. S7 posterior margin truncate. T7 medially concave with distinct tooth laterally, posterior margin truncate. S8 with sublateral process smooth, pale yellow, nearly as thick as areolate and microsetose lateral process, medial process punctate and setose, with shallow medial emargination on posterior margin. Genitalia. Genitalia as in Figs 17–20 . Dorsal parapenial lobe angular posteriorly, ventral parapenial lobe rounded posteriorly. Paramere contorted, dorsoventrally compressed, subapically dilated before acuminate posterior apex. Penis valve postero-dorsally with rounded densely setose lobe, postero-ventrally with blunt tooth. Female. Unknown.

Type material. Holotype ♂: VIETNAM, Dong Nai, Cat Tien National Park, Dong trail, Malaise traps, c. 100 m, 1–8.IV.2007, Mai Phu Quy and Nguyen Thanh Manh ( RMNH).

Distribution. Known from the type locality only.

Etymology. We are proud to name this species in honor of our colleague and friend, Denis J. Brothers.

Remarks. This species was collected in the Southeastern Indochina dry evergreen forests ecoregion during the dry season. Most species of Krombeinella have the mesosoma partly reddish and partly black. The Palaearctic species, however, generally have the propodeum blackish and the pronotum reddish, while K. brothersi has this pattern reversed. The disjunct distribution of this species may necessitate its eventual placement in a different genus, especially if the eventually discovered female differs greatly from other Krombeinella . This is the third Myrmosini genus, after Taimyrmosa Lelej, 2005 and Erimyrmosa Lelej, 1984 , known to span both the Palaearctic and Oriental ecozones.

Figures

FIGURES 8–12. Krombeinella brothersi sp. nov. male. 8. Dorsal habitus. 9. Lateral habitus. 10. Face. 11. T7, lateral view. 12. S8, ventral view.

FIGURES 13–20. Myrmosinae, male genitalia. 13–14. Kudakrumia malaenglek sp. nov. 15–16. Kudakrumia loaibonho sp. nov. 17–20. Krombeinella brothersi sp. nov. 13, 15, 17. Dorsal view. 14, 16, 18. Ventral view. 19. Sagittal view. 20. Penis valve, lateral view.