Pison rotundum 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 : 390-391

Pison rotundum Pulawski , species nova

Figures 946-947.

NAME DERIVATION.– Rotundum, a Latin neuter adjective meaning rounded; with reference to the rounded free clypeal margin of the female.

RECOGNITION.– The female of P. rotundum (the male is unknown) has three submarginal cells, the second recurrent vein contiguous with the second intersubmarginal vein or nearly so, and the setae appressed on tergum I. It shares with P. longulum the regularly round- ed clypeal free margin, forming a single arch from one orbit to the other (Fig. 946). It differs from P. longulum in having a shorter propodeal dorsum (about 1.5 × as long mesally as the scutellum, rather than twice as long), a shorter flagellomere I (dorsal length 2.1 × apical width, rather than 2.5-2.6 ×), covered with minute, inconspicuous punctures (rather than FIGURE 946. Pison rotundum Pulawski , sp. nov., female.

Clypeus and mandibles. conspicuous punctures), and in having the scutellum slightly more convex. Also similar are P. laterirugosum and P. sinuosum (only the females are known), in which, however, the clypeal free margin is minimally concave on each side, the dorsal length of flagellomere I is 2.7-3.2 × apical width (2.1 × apical width in P. rotundum ), and in P. laterirugosum , the side of the propodeal dorsum in conspicuously ridged (inconspicuously so in P. rotundum ).

DESCRIPTION.– Frons dull, finely punctate, punctures shallow, ill defined, no more than one diameter apart. Occipital carina joining hypostomal carina. Gena narrow in dorsal view. Labrum not emarginate. Anteromedian pronotal pit transversely elongate, about as long as midocellar diameter. Propleuron sparsely punctate except nearly impunctate anteriorly. Scutum not foveate along flange, without longitudinal ridges adjacent to posterior margin; scutal punctures fine, shallow, averaging about one diameter apart. Tegula not enlarged. Mesopleural punctures compressed against each other. Postspiracular carina present, about as long as midocellar diameter. Metapleural sulcus costulate between dorsal and ventral metapleural pits; ventral half of metapleuron with microscopic punctures. Propodeum with inconspicuous longitudinal carina separating side from dorsum and posterior surface and extending from gastral socket area toward spiracle; dorsum obliquely ridged (ridges becoming evanescent toward lateral margin); side irregularly ridged, punctate between ridges; posterior surface conspicuously transversely ridged. Posteroventral forefemoral surface finely punctate, punctures about 1-2 diameters apart. Hindcoxal dorsum with outer margin obtusely carinate. Punctures of tergum I about one diameter apart on horizontal part, less than that on apical depression. Sternum II punctate throughout, punctures conspicuous mesally and averaging about 1-2 diameters apart.

Setae silvery, suberect (partly erect) on frons, about as long as half midocellar diameter, diverging toward dorsum from midline between dorsal end of midscutal carina and midocellus, appressed on scutum and tergum I; on lower gena straight, slightly shorter than one midocellar diameter; not concealing integument on clypeus (sculpture easily visible). Apical depressions of terga with silvery, setal fasciae.

Body all black, mandible ferruginous mesally.

♀.– Upper interocular distance equal to 0.68 × lower interocular distance; ocellocular distance equal to 0.7 × hindocellar diameter, distance between hindocelli equal to 1.0 × hindocellar diameter; eye height equal to 1.06 × distance between eye notches. Free margin of clypeal lamella forming single regular arch from orbit to orbit, not concave laterally (Fig. 946). Dorsal length of flagellomere I 2.1 × apical width, of flagellomere IX 1.3 × apical width. Mandible: trimmal carina with small incision at about midlength.

Length 5.5 mm; head width 1.8 mm.

♂.– Unknown.

GEOGRAPHIC DISTRIBUTION (Fig. 947).–

Known from two localities in eastern Queensland.

RECORDS.– HOLOTYPE: ♀, AUSTRALIA:

Queensland: Eungella National Park, 16-19 Oct

1979, H.E. Evans, M.A. Evans, and A. Hook (QMB,

registration number T228760).

PARATYPE: AUSTRALIA: Queensland: same data as holotype (2 ♀, QMB); Lake Monduran at

FIGURE 947. Collecting localities of Pison rotundum 24°52.1ʹS 151°51.0ʹE, 26 Oct 2006, V. Ahrens and

Pulawski, sp. nov.

W.J. Pulawski (1 ♀, CAS) .