Arpactophilus cemuhi, 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 : 17-18

Arpactophilus cemuhi sp. nov.

( Figs. 39–40 )

Diagnosis. Arpactophilus cemuhi is the only New Caledonian species in the genus with the combination of one submarginal cell in the forewing, a dorsally-interrupted occipital carina ( Fig. 6 ), a clypeus yellow in the apical half, yellow markings on the lower frons ( Fig. 39 ) and around the mandibular base ventrally on the gena, a head much longer than broad, and finely reticulate dorsal and lateral surface of propodeum (similar to pattern in Fig. 21 ).

Description. FEMALE: Total length 2.8 mm; forewing length 1.8 mm.

Body black, with areas of brown and yellow. Yellow: apical half of clypeus; (labrum not visible); mandible; palpi; area around mandibular base; antenna, posterior and towards apex darker; lower frons between inner compound eye margin and scape; anterior pronotal margin; tegula; coxae apically; trochanters; profemur; meso- and metafemora basally and apically; tibiae; tarsi. Brown: pronotal lobe; most of coxae; most of meso- and metafemora; metasoma. Wings hyaline; pterostigma light brown.

Head about 1.3 × as long as wide in frontal view. Apical margin of clypeus projecting medially with a small incision ( Fig. 39 ). Labrum not visible. Ventral mandibular tooth about ¼–1/5 of total mandibular length, not reaching opposite mandibular base. Palpal formula 4:3. Frons imbricate, with sparse punctation and short setae. Frontal carina present from upper frons (but not reaching median ocellus) to apical half of clypeus, forming a point at basal clypeal margin. Scape 3.0 × as long as wide. Median ocellus on tangent between upper posterior orbits of compound eyes, lateral ocelli posterior of tangent. Occipital carina interrupted dorsally ( Fig. 6 ). Gena imbricate, with dense setae ventrally, without tubercles, spines, or dorsoventral carina. Hypostomal midventral line carinate, not angulate.

Mesosoma about 2.2 × as long as wide in dorsal view. Propodeum about 1.1 × as long as wide in dorsal view. Mesosoma imbricate ( Fig. 40 ); lateral surface of propodeum also transversely carinulate; dorsal surface of propodeum also imbricate, finely reticulate, and transversely carinulate (similar to pattern in Fig. 21 ). Slightly pitted sulcus present posterior to fine mesoscuto-mesoscutellar sulcus. Hypersternal sulcus present as short thin line close to omaulus. Metafemur 3.4 × as long as wide. Metatibia without differently colored area apically. Pretarsal claws without teeth. Forewing with one submarginal cell. Hind wing with five distal hamuli.

Metasoma polished, with sparse punctation and associated setae ( Fig. 40 ). Metasomal sternum II without bulge (as in Fig. 1 ). Pygidium with narrow row of silk setae apically.

MALE: Difference from female aside from genitalic structures: legs yellow. Metasomal sternum VIII neither broadened nor narrowed.

Remarks. Arpactophilus cemuhi is somewhat similar to A. caledonicus , A. nengone and A. drubea in having a single submarginal cell and a dorsally-interrupted occipital carina. It can be distinguished from A. caledonicus and A. nengone by the yellow marks on the frons of A. cemuhi . Arpactophilus drubea differs in its broader head and coarser sculpturing on the dorsal surface of the propodeum than those in A. cemuhi . The species is similar to A. dolichocara in its elongate head and single submarginal cell, but can be distinguished from by the brown or black clypeus and continuous occipital carina of the latter. Material examined. HOLOTYPE ♀: “Nouvelle Calédonie, Mont Koghis. 350m, 25.IV.1995, Réc. Chazeau & Jourdan” [MNHN].

PARATYPE 1♂: “Nouvelle Calédonie, Mont Koghis. 350m, 25.IV.1995, Réc. Chazeau & Jourdan” [MNHN].

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

Figures

FIGURES 35 – 40. Facial views and lateral habitus of ♀ holotypes (except for Arpactophilus caledonicus Bohart) of species of Arpactophilus Smith. 35. A. caac sp. nov., facial view; 36. A. caac, lateral habitus; 37. A. caledonicus, facial view; 38. A. caledonicus, lateral habitus; 39. A. cemuhi sp. nov., facial view; 40. A. cemuhi, 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 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 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.