Pison parvum 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 : 323-325

Pison parvum Pulawski , species nova

Figures 772 -777.

NAME DERIVATION.– Parvum is a Latin neuter adjective, meaning small; with reference to this species small size.

RECOGNITION.– Pison parvum is a small (length of male 4.8-5.3 mm), all black species (hindtarsus ferruginous in some specimens), with the second recurrent vein contiguous with the second intersubmarginal vein, and the setae appressed on tergum I. The male (the female is unknown) is primarily characterized by a roundly arcuate clypeal lamella ( Fig. 772 ), not acutely angulate, and by sternum VIII not emarginate apically and rounded apicolaterally ( Fig. 774 ). It differs from most such species in having sternum II punctate throughout, although the apicomedian punctures can be minute and sparse. Pison subtile is similar, but differs by several prominent characters: its tibiae and tarsi are ferruginous (at least the tibiae are black in P. parvum ), flagellomeres III and IV are minutely microsculptured. Scutellum foveate along anterior margin. Tegula enlarged. Mesopleural punctures well defined, less than one diameter apart; interspaces microareolate, dull. Postspiracular carina present, about as long as midocellar diameter. Metapleural sulcus costulate between dorsal and ventral metapleural pits. Propodeum with irregular longitudinal carina separating side from dorsum and posterior surface and extending from gastral socket area toward spiracle; dorsum longitudinally ridged near base, transversally ridged on both sides on median sulcus, remaining surface finely, irregularly rugose; side ridged, punctate between ridges; posterior surface with well-defined, transverse ridges, punctate between ridges. Posteroventral forefemoral surface sparsely punctate basally. Punctures of tergum I mostly less than one diameter apart, some punctures about one diameter apart. Sternum II punctate throughout (apicomedian punctures either well defined or minute).

Setae silvery, subappressed on upper frons, appressed on postocellar area, scutum, and tergum I; completely concealing integument on clypeus (except lamella); on lower gena suberect, straight (curved apically), less than one midocellar diameter. Apical depressions of terga with silvery, setal fasciae.

Body black, hindtarsus ferruginous in some specimens.

♀.– Unknown.

♂.– Upper interocular distance equal to 0.8 × lower interocular distance; ocellocular distance equal to 0.80-0.82 × hindocellar diameter, distance between hindocelli equal to 1.3-1.4 × hindocellar diameter; eye height equal to 0.94-1.10 × distance between eye notches. Free margin of clypeal lamella roundly arcuate ( Fig. 772 ).

Dorsal length of flagellomere I 1.7 × apical width, of flagellomere X 1.0-1.2 × apical width. Sternum VIII apically rounded, not emarginate ( Fig. 774 ). Genitalia: Figs. 775,

776. Length 4.8-5.3 mm; head width 1.5-1.9

mm.

GEOGRAPHIC DISTRIBUTION (Fig. 777).–

Known from one locality in northwestern part of Western Australia.

RECORDS.– HOLOTYPE: ♂, AUSTRALIA: Western Australia: 47 km S Pardoo Road House at

20°22.7ˈS 120°01.3ˈE, 1-14 May 2003, M.E. Irwin and F.D. Parker (ANIC). FIGURE 777. Collecting locality of Pison parvum Pulaw-

PARATYPE: AUSTRALIA: Western Australia: ski, sp. nov .

same data as holotype (1 ♂, CAS) .

Figures

FIGURES 772-776. Pison parvum Pulawski, sp. nov., male. (772) Clypeus and mandible; (773) Head in dorsal view; (774) Sternum VIII (ventral surface); (775) Genitalia in dorsal view (right gonocoxite bent under); (776) Geni- talia in lateral view.