Petersenidia Lelej in Lelej & Yamane, 1992

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 : 39

Genus 27. Petersenidia Lelej in Lelej & Yamane, 1992

Diagnosis. FEMALE. This genus can be separated from other Oriental mutillids by the following combination of characters: propodeum narrower than or as broad as pronotum; scutellar scale distinct; T2 disc with two laterally disposed white to golden setal spots; T2 apex without pale setal band, at most with sparse fringe; pygidium defined by lateral carinae and usually entirely smooth. The pygidium of Petersenidia is usually wider and defined by stronger lateral carinae than Krombeinidia . MALE. See Lelej (1996c).

Diversity and Distribution. This is something of a dumping-ground genus for Trogaspidiini species with symmetrical penis valves. Lelej (2005) listed 21 species belonging to Petersenidia and 23 species doubtfully placed in the genus. Petersenidia is widespread in the Oriental region.

Remarks. Like Krombeinidia , this large genus is more reliably defined by male morphology than female. We have used the absence of a white setal band at the apex of T2 as the primary determinant for genus placement of the new species below. Eventual discovery of the males could disprove these hypotheses.