Pison austrinum 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 : 98-99

Pison austrinum Pulawski , species nova

Figures 166 -168.

NAME DERIVATION.– Austrinum is the Latin neuter adjective meaning southern; with reference to the specimens originating from South Australia.

RECOGNITION.– The female of P. austrinum (the male is unknown) has three submarginal cells, the second recurrent vein interstitial with the second intersubmarginal vein, and the setae appressed on tergum I. It is further characterized by the following: propodeum without longitudinal carina separating side from dorsum and posterior surface and extending from gastral socket area toward spiracle, and setae of lower gena appressed, straight, about as long as 0.5 × midocellar diameter. Pison angustivertex and P. brachyceras are similar, but P. austrinum differs in having the legs ferruginous (rather than black); also, the dorsal length of flagellomere I is 1.6 × the apical width, while it is 1.8-2.0 × in P. angustivertex .

DESCRIPTION.– Frons swollen above antennal socket, conspicuously microsculptured, finely, shallowly punctate, punctures about one diameter apart; middle supraantennal carina present or absent. Occipital carina not joining hypostomal carina. Labrum shallowly emarginate. Anteromedian pronotal pit transversely elongate, about as long as midocellar diameter. Scutum not foveate along flange, without longitudinal ridges adjacent to posterior margin; scutal punctures well defined, about one diameter apart. Tegula somewhat enlarged. Mesopleural punctures well defined, less than one diameter apart (some punctures slightly more than one diameter apart in holotype). Postspiracular carina present, about 1.5 × as long as midocellar diameter. Metapleural sulcus with two or three fine ridges between dorsal and ventral metapleural pits. Propodeum without longitudinal carina separating side from dorsum and posterior surface and extending from gastral socket area toward spiracle; dorsum irregularly obliquely ridged, punctate between ridges, only punctate laterally; side finely ridged, punctate between ridges; posterior surface transversely ridged, punctate between ridges. Posteroventral forefemoral surface microscopically punctate, punctures about 2-3 diameters apart. Hindcoxal dorsum with outer margin obtusely carinate. Punctures of tergum I well defined on horizontal portion, about one diameter apart, microscopically small on apical depression. Sterna closely punctate throughout.

Setae silvery, suberect and oriented obliquely dorsally on upper frons, suberect on scutum, about 0.5 × as long as midocellar diameter, appressed on tergum I; appressed, straight on lower gena, about 0.5 × as long as midocellar diameter; not completely concealing integument on clypeus. Apical depressions of terga with silvery setal fasciae, well-defined only from certain angles.

Head, thorax, propodeum, and gaster black, clypeal lamella ferruginous, mandible ferruginous except black basally and apically. Femora, tibiae, and tarsi ferruginous.

♀.– Upper interocular distance equal to 0.88-0.90 × lower interocular distance; ocellocular distance equal to 1.2-1.3 × hindocellar diameter, distance between hindocelli equal to 1.3-1.4 ×

hindocellar diameter ( Fig. 167 ); eye height equal to 0.92-0.98 × distance between eye notches. Clypeal lamella somewhat elongate, its free margin obtusely angulate ( Fig. 166 ). Dorsal length of flagellomere I 1.6 × apical width, of flagellomere IX 1.2-1.3 × apical width. Mandible: trimmal carina forming small, round tooth proximally of incision ( Fig. 166 ). Length 5.8-6.5

mm; head width 1.8-1.9 mm.

♂.– Unknown.

GEOGRAPHIC DISTRIBUTION (Fig. 168).–

South Australia.

RECORDS.– HOLOTYPE: ♀, AUSTRALIA: South

Australia: Chowilla Game Reserve 24 air km

N Renmark at 33°58.0ʹS 140°48.8ʹE, 6 Dec 2010,

V. Ahrens and W.J. Pulawski ( SAM).

PARATYPE: AUSTRALIA: South Australia: 10

km NNW Penong at 31°50.3ʹS 132°57.9ʹE, 16 Jan FIGURE 168. Collecting localities of Pison austrinum 2011, V. Ahrens and W.J. Pulawski (1 ♀, CAS). Pulawski, sp. nov.

Figures

FIGURES 166–167. Pison austrinum Pulawski, sp. nov., female. (166) Clypeus and mandibles; (167) Head in dorsal view.