Pison pumilio Pulawski, 2018

Pulawski, Wojciech J., 2018, A Revision of the Wasp Genus Pison Jurine, 1808 of Australia and New Zealand, New Guinea, and the Pacific Islands (Hymenoptera: Crabronidae), Proceedings of the California Academy of Sciences 65, pp. 1-584 : 366-368

Pison pumilio Pulawski , species nova

Figures 886 -891.

NAME DERIVATION.– Pumilio, Latin for dwarf; a noun in apposition to the generic name; with reference to this species small size.

RECOGNITION.– Pison pumilio is an all black species with three submarginal cells, the second recurrent vein interstitial with the second intersubmarginal vein or nearly so, and setae appressed on tergum I. The female is unknown, and the male is characterized by sternum VIII with the apical margin minimally convex to minimally concave, not emarginate, with minute apicolateral corner ( Fig. 888 ), in combination with the tegula all finely punctate except narrowly impunctate near apex ( Fig. 887 ), and the propodeal dorsum finely rugose. Subsidiary diagnostic characters are the following: ocellocular distance equal to 0.8-1.1 × hindocellar diameter, clypeal lamella acutely angulate ( Fig. 886 ), sternal punctures averaging about one diameter apart, sternal setae appressed, length 4.0- 4.8 mm.

DESCRIPTION.– Frons dull, finely punctate, punctures less than one diameter apart, middle supraantennal carina absent or evanescent. Occipital carina joining hypostomal carina. Gena moderately narrow in dorsal view. Labrum emarginate. Anteromedian pronotal pit rounded, about as wide as 0.5 × midocellar diameter. Scutum not foveate along flange, without longitudinal ridges adjacent to posterior margin; scutal punctures less than one diameter apart ( Fig. 887 ). Tegula not enlarged, finely punctate throughout (except narrowly impunctate near apex). Mesopleural punctures nearly contiguous. Postspiracular carina ill defined, about as long as midocellar diameter. Metapleural sulcus costulate between dorsal and ventral metapleural pits. Propodeum with ill-defined, irregular, longitudinal carina separating side from dorsum and posterior surface and extending from gastral socket area toward spiracle; dorsum finely, irregularly rugose; side finely ridged, punctate between ridges; posterior surface transversely ridged, punctate between ridges, with several ridges radiating up from transverse carina just above gastropropodeal articulation. Posteroventral forefemoral surface minutely, closely punctate. Hindcoxal dorsum with outer margin sharply carinate apically. Punctures of tergum I less than one diameter apart or some punctures, anterior of apical depression, one diameter apart. Sterna punctate throughout.

Setae silvery, appressed on postocellar area, scutum, and tergum I; oriented ventrally on whole frons or forming pair of patches of laterally oriented setae slightly below midocellus; on lower gena, suberect, up to one midocellar diameter long, completely concealing integument on clypeus except on lamella. Apical depressions of terga with silvery setal fasciae.

Body all black.

♀.– Unknown.

♂.– Upper interocular distance equal to 0.88-0.90 × lower interocular distance; ocellocular distance equal to 0.8-1.1 × hindocellar diameter, distance between hindocelli equal to 1.4-1.5 × hindocellar diameter; eye height equal to 0.90-0.96 × distance between eye notches. Free margin of clypeal lamella acutely angulate ( Fig. 886 ). Dorsal length of flagellomere I 1.6-1.7 × apical width, of flagellomere X 0.9-1.0 × apical width. Sternum VIII with apical margin straight or minimally concave ( Fig. 888 ). Genitalia: Figs. 889, 890 . Length 4.0- 4.8 mm; head width 1.5-1.6 mm.

GEOGRAPHIC DISTRIBUTION (Fig. 891).– Northern parts of Nothern Territory and of Western Australia.

RECORDS.– HOLOTYPE: ♂, AUSTRALIA: Western Australia: 47 km S Pardoo Roadhouse at 20°22ʹ7ʺS 120°01ʹ3ʺE, 1-14 May 2003, M.E. Irwin and F.D. Parker ( ANIC).

PARATYPES: AUSTRALIA: Northern Territory: Gregory National Park at 16°03ʹ01ʺS 130°24ʹ0.7ʺE, 9-20 June 2001, M.E. Irwin and F.D. Parker (1 ♂, CAS) . Western Australia: same data as holotype (1 ♂, ANIC; 1 ♂, CAS) .

Figures

FIGURES 886-890. Pison pumilio Pulawski, sp. nov., male. (886) Clypeus and mandibles; (887) Tegula and adjacent scutum; (888) Sternum VIII (ventral surface); (889) Genitalia in dorsal view; (890) Genitalia in lateral view. FIGURE 891. Collecting localities of Pison pumilio Pulawski, sp. nov.