Pison tosawai Yasumatsu

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 : 564-565

Pison tosawai Yasumatsu

Figure 1370-1371.

Pison tosawai Yasumatsu, 1935:234 , ♂. Holotype: ♂, Japan: Bonin Islands: Island of Chichijima (OMNH), examined. – Yasumatsu, 1936:361 (Bonin = Ogasawara Islands), 1939:82 (in key to Pison of eastern Asia), 84 (in checklist of Pison of Japanese Empire), 1953:135 (in list of Pison of Pacific islands); Tsuneki, 1964:49 (in key to Trypoxylini of Japan), 1984a:11 (known from Ogasawara = Bonin Islands), 1984:10 (redescription of ♂, description of ♀); R. Bohart and Menke, 1976:336 (in checklist of world Sphecidae ); Terayama and Nambu, 2009:2, 24 (in key to Trypoxylini of Japan); Takahashi, 2010:19 ( Japan: in list of Hymenoptera of Ogasawara = Bonin islands).

RECOGNITION.– Pison tosawai shares with P. punctifrons and P. suspiciosum the presence of erect setae on tergum I. It differs from these species in having the male clypeal lamella truncate apically (Fig, 1370) rather than pointed. Unlike P. punctifrons , it has the longitudinal carina separating the propodeal side from the dorsum and the posterior surface (carina absent in P. punctifrons ), the apical depression of tergum I unsculptured (rather than finely punctate) and male sternum VIII deeply emarginate apically (rather than truncate). Unlike P. suspiciosum , the interspaces on the scutum are microsculptured and dull (rather than unsculptured and shiny, and the dorsal length of male flagellomere I is 2.9 × (rather than 1.9-2.0 ×).

DESCRIPTION.– Frons dull, with well-defined punctures that average less than one diameter apart mesally and laterally, about one diameter apart sublaterally; interspaces microareolate, middle supraantennal carina absent. Occipital carina joining hypostomal carina. Labrum minimally 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, averaging about two diameters apart; interspaces microareolate. Tegula not enlarged. Mesopleural punctures conspicuous, less than one diameter apart. Postspiracular carina present but inconspicuous, about as long as midocellar diameter. Metapleural sulcus costulate between dorsal and ventral metapleural pits. Propodeum with longitudinal carina separating side from dorsum and posterior surface and extending from gastral socket area toward spiracle; dorsum obliquely ridged (ridges increasing in size laterally), with middle sulcus but without median carina; side punctatorugose; posterior surface irregularly, transversely ridged. Posteroventral forefemoral surface with well-defined punctures that are less than one diameter apart. Punctures of tergum I fine, several diameters apart on horizontal part, apical depression unsculptured, shiny. Sterna punctate throughout, punctures of sternum II averaging several diameters apart.

Setae silvery, erect on postocellar area, scutum, and tergum I, not concealing integument on clypeus, straight on lower gena; setal length about 1.5 × midocellar diameter on postocellar area, 1.0 × on scutum, and up to 2.0 × on lower gena. Terga without silvery, setal fasciae.

Body all black.

♀ (from Tsuneki, 1984b).– Ocellocular distance equal to 0.5 × hindocellar diameter; distance between hindocelli 0.6 × hindocellar diameter. Free margin of clypeal lamella arcuate. Length 9.5-11.0 mm.

♂.– Upper interocular distance equal to 0.76 × lower interocular distance; ocellocular distance equal to 1.0 × hindocellar diameter, distance between hindocelli equal to 0.8 × hindocellar diameter; eye height equal to 1.06 × distance between eye notches. Free margin of clypeal lamella truncate apically, truncation minimally concave (Fig. 1370). Dorsal length of flagellomere I 2.9 × apical width, of flagellomere X 2.0 × apical width. Sternum VIII conspicuously, deeply emarginate apically. Length 11.0 mm; head width 3.2 mm.

GEOGRAPHIC DISTRIBUTION (Fig. 1371). Known only from Island of Chichijima in the Ogasawara archipelago.

RECORDS.– JAPAN: Ogasawara Archipelago: Island of Chichijima : no specific locality (1 ♂, OMNH, holotype of Pison tosawai ), Minimifukorozawa (Tsuneki, 1984b) .