Arpactophilus pwapwa, Breitkreuz, Laura C. V., Ohl, Michael & Engel, Michael S., 2016

Breitkreuz, Laura C. V., Ohl, Michael & Engel, Michael S., 2016, A review of the New Caledonian Arpactophilus (Hymenoptera: Crabronidae), Zootaxa 4063 (1), pp. 1-66 : 46

Arpactophilus pwapwa sp. nov.

( Figs. 93–94 )

Diagnosis. Arpactophilus pwapwa is the only New Caledonian species in the genus with the combination of a sternum II with a bulge ( Fig. 93 , and as in Fig. 2 ), a dorsally-interrupted occipital carina ( Fig. 6 ), a brown mandible with yellow anteriorly, yellow femora with some brown areas, an almost flat hypostomal midventral line (slightly angulate medially), a gena with dense punctation and associated setae, a yellow pronotal lobe, a metatibia with a well-delimited dark brown area on the metatibia (as in Figs. 8–9 ), and a roughly punctured frons without a distinct carina parallel to the inner compound eye margin ( Fig. 93 ).

Description. FEMALE: Total length 5.2–6.1 mm, mean = 5.6 mm; forewing length 3.1–3.3 mm, mean = 3.2 mm.

Body black, with areas of yellow and brown. Yellow: mandible laterally at base; palpi; antenna (darker towards apex); anterior pronotal margin; pronotal lobe; tegula; legs except pro- and mesocoxa basally, parts of pro- and mesofemora and apical area on metatibia. Brown: labrum; most of mandible; pro- and mesocoxa basally; pro- and mesofemora partially; apical area on metatibia. Wings hyaline; pterostigma dark brown.

Head about 1.1 × as long as wide in frontal view. Apical margin of clypeus strongly projecting medially, medioapically with shallow concave incision ( Fig. 93 ). Apical margin of labrum with a shallow concave incision medially. Ventral mandibular tooth about ¼–1/5 of total mandibular length, not reaching opposite mandibular base. Palpal formula 5:4. Frons colliculate and with short setae. Frontal carina present from median ocellus to apical half of clypeus, elevated to a small point at basal clypeal margin. Scape 3.7 × as long as wide. Ocellar triangle anterior of tangent between upper posterior orbits of compound eyes, lateral ocelli anterior of tangent by more than their diameter. Occipital carina interrupted dorsally ( Fig. 6 ). Gena imbricate with laterally dense punctation and short setae and ventrally sparse punctation and long setae, without tubercles, spines, or dorsoventral carina. Hypostomal midventral line faint anteriorly, carinate posteriorly with bordering sparse and short transverse carinulae on hypostomal integument, slightly angulate medially.

Mesosoma about 1.7 × as long as wide in dorsal view. Propodeum about 0.8 × as long as wide in dorsal view. Mesosoma colliculate ( Fig. 94 ), except on propodeum; lateral surface of propodeum transversely carinate; dorsal surface of propodeum coarsely reticulate (similar to pattern in fig. 18). Pitted sulcus present posterior to mesoscuto-mesoscutellar sulcus. Hypersternal sulcus absent. Metafemur 3.3 × as long as wide. Metatibia with a well-delimited dark brown, slightly flattened area apically (similar to Fig. 8 ). Pretarsal claws without teeth. Forewing with two submarginal cells; anterior border of submarginal cell II slightly shorter than posterior border. Hind wing with five distal hamuli.

Metasoma polished, punctation sparse ( Fig. 94 ). Metasomal sternum II swollen medially, forming bulge (as in Fig. 2 ). Pygidium with broad row of silk setae.

MALE: Unknown.

Remarks. Arpactophilus pwapwa is similar to A. kumak , A. vamale , A. nyelayu , A. xaragure , A. nyelayu , A. orowe , and A. arboreus as all share the combination of a dark brown or black metasoma with a bulge on the metasomal sternum II and a dark brown or black clypeus with a medially strongly projecting apical margin that has no or only a small incision medially. See remarks-section of A. kumak .

Material examined. HOLOTYPE ♀: “ NEW CALEDONIA 12020: 22°17’S x 166°53’E, 250m, Pic du Gran Kaori, site 1. 22 Dec 2004– 12 Jan 2005. Burwell, Wright. malaise, rainforest” [QM].

PARATYPE 1♀: “ NEW CALEDONIA 11790: 22°14’S x 166°50’E, 280m, Pic du Pin, site 2. 25 Nov 2004. Wright. sweeping, rainforest” [QM].

Etymology. The specific epithet is taken from the name Pwapwâ , one of the New Caledonian native languages. It is treated as a noun in apposition.

Figures

FIGURES 89 – 94. Facial views and lateral habitus of ♀ holotypes (except for Arpactophilus propodealis Bohart) of species of Arpactophilus Smith. 89. A. propodealis, facial view; 90. A. propodealis, lateral habitus; 91. A. pwaamei sp. nov., facial view; 92. A. pwaamei, lateral habitus; 93. A. pwapwa sp. nov., facial view; 94. A. pwapwa, lateral habitus.

FIGURES 1 – 4. Line drawings of metasomata and forewings of New Caledonian species of Arpactophilus Smith. 1. Metasoma in profile of ♀ of Arpactophilus merle sp. nov., arrow indicates unmodified metasomal sternum II; 2. Metasoma in profile of ♀ of A. irwini Bohart, arrow indicates ventrally swollen metasomal sternum II. 3. Forewing of ♀ of A. irwini; ps: pterostigma, sz I: submarginal cell I, sz II: submarginal cell II. 4, Forewing of ♀ of A. caledonicus Bohart; ps: pterostigma, sz I: submarginal cell I.

FIGURES 5 – 9. Head and metatibial details of New Caledonian Arpactophilus Smith. 5. Schematic view of posterior of head of Arpactophilus, arrow indicates complete occipital carina; 6. Schematic with arrow indicating incomplete, dorsallyinterrupted occipital carina; 7: Metatibia of holotype ♀ of A. xaragure sp. nov., arrow indicating slightly differently colored but not differently-structured area apically; 8. Metatibia of holotype ♀ of Arpactophilus orowe sp. nov., arrow indicating differently colored and structured area apically; 9. Metatibia of paratype ♀ of A. orowe, scanning electron micrograph with arrow indicating concave area apically.