Arpactophilus arhoe, 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 : 14

Arpactophilus arhoe sp. nov.

( Figs. 29–30 )

Diagnosis. Arpactophilus arhoe is the only New Caledonian species in the genus with the combination of a black clypeus ( Fig. 29 ), a continuous occipital carina ( Fig. 5 ), an imbricate and punctured gena without a carina, a black metasoma, and a bulge on sternum II ( Fig. 30 and as in Fig. 2 ).

Description. FEMALE: Total length 5.4 mm; forewing length 3.4 mm.

Body black, with areas of dark yellow and brown. Dark yellow: labrum; palpi; scape; pedicel; flagellum in front; anterior pronotal margin; tegula; coxae apically; trochanters; most of femora; tibiae; tarsi. Brown: mandible partially; posterior surface of of flagellum; pronotal lobe apically; most of coxae; femora partially ( Fig. 30 ). Wings hyaline; pterostigma dark brown.

Head about 0.9 × as long as wide in frontal view. Apical margin of clypeus medially projecting, with shallow, broad medial incision ( Fig. 29 .). Apical margin of labrum with two small lobes. Ventral mandibular tooth about ¼– 1/5 of total mandibular length, not reaching opposite mandibular base. Palpal formula 5:4. Frons imbricate, with dense, coarse punctation, punctures separated by less than a puncture width and dense setae ( Fig. 29 ). Frontal carina present from median ocellus to almost apical margin of clypeus, elevated to a distinct ridge on clypeus. Scape 3.9 × as long as wide. Ocellar triangle anterior of tangent between upper posterior orbits of compound eyes, lateral ocelli anterior of tangent by less than their diameter. Occipital carina continuous ( Fig. 5 ). Gena imbricate, with dense, coarse punctation and dense setae, without tubercles, spines, or dorsoventral carina. Hypostomal midventral line carinate, with bordering short transverse carinulae on hypostomal integument, not angulate.

Mesosoma about 1.7 × as long as wide in dorsal view. Propodeum about 0.8 × as long as wide in dorsal view. Mesosoma imbricate with additional dense punctation ( Fig. 30 ), except dorsal surface of propodeum; lateral surface of propodeum also transversely carinulate; dorsal surface of propodeum coarsely reticulate (similar to pattern in Fig. 18 ). Pitted sulcus present posterior of fine mesoscuto-scutellar sulcus. Hypersternal sulcus long and pitted. Metafemur 2.6 × as long as wide. Metatibia without differently colored area apically. Pretarsal claws without teeth. Forewing with two submarginal cells; anterior border of submarginal cell II slightly shorter than posterior border. Hind wing with two distal hamuli.

Metasoma polished, with sparse punctation ( Fig. 30 ). Metasomal sternum II swollen medially, forming bulge (as in Fig. 2 ). Pygidium with broad row of silk setae apically.

MALE: Unknown

Remarks. Arpactophilus arhoe can be distinguished from all other Arpactophilus with a bulge on the metasomal sternum II by the form of its clypeus. In A. arhoe , the apical margin of the clypeus is medially projecting, with a shallow, broad medial concave incision. Among species with a bulging metasomal sternum II, the form of the clypeus is closest to that of A. arha , but the two species differ noticeably in coloration, especially of the clypeus and lower frons, which are black in A. arhoe ( Fig. 29 ) and yellow in A. arha ( Fig. 27 ). Arpactophilus pwaamei and A. tayo are also similar in coloration and clypeal form, but they have no bulge on metasomal sternum II.

Material examined. HOLOTYPE ♀: “Nouvelle Calédonie, Pinda 30m, 18.IV.1995, Réc. Chazeau & Jourdan [ MNHN].

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

Figures

FIGURES 29 – 34. Facial views and lateral habitus of ♀ holotypes of species of Arpactophilus Smith. 29. Arpactophilus arhoe sp. nov., facial view; 30. A. arhoe, lateral habitus; 31. A. brochus sp. nov., facial view; 32. A. brochus, lateral habitus; 33. A. bwatoo sp. nov., facial view; 34. A. bwatoo, lateral habitus.

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.

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 16 – 22., Dorsal surfaces of ♀ of species of Arpactophilus Smith. 16. Arpactophilus concavus Bohart; 17. A. irwini Bohart; 18. A. kumak sp. nov. (holotype); 19. A. merle sp. nov. (holotype); 20. A. caac sp. nov. (holotype); 21. A. kraussi Bohart; 22. A. propodealis Bohart.

FIGURES 23 – 28. Facial views and lateral habitus of ♀ holotypes (except for Arpactophilus abdominalis Bohart and A. arboreus Bohart) of species of Arpactophilus Smith. 23. A. abdominalis, facial view; 24. A. abdominalis, lateral habitus; 25. A. arboreus, facial view; 26. A. arboreus, lateral habitus; 27. A. arha sp. nov., facial view; 28. A. arha, lateral habitus.