Arpactophilus nengone, 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 : 35-36

Arpactophilus nengone sp. nov.

( Figs. 75–76 )

Diagnosis. Arpactophilus nengone 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 that is light yellow in the apical half ( Fig. 75 ), a black frons, and a hypostomal midventral line carinate with bordering sparse and short transverse carinulae on hypostomal integument.

Description. FEMALE: Total length 2.9–3.1 mm, mean = 3.0 mm; forewing length 1.6–1.9 mm, mean = 1.8 mm.

Body black, with areas of yellow. Yellow: apical half of clypeus ( Fig. 75 ); labrum; mandible; palpi; scape, front lighter than posterior; pedicel; anterior pronotal margin; pronotal lobe; tegula; legs. Flagellum brown. Wings hyaline; pterostigma light brown.

Head about 1.2 × as long as wide in frontal view. Apical margin of clypeus medially projecting, with shallowly concave incision. Apical margin of labrum projecting, with shallow V-shaped incision. Ventral mandibular tooth about ¼–1/5 of total mandibular length, not reaching opposite mandibular base. Palpal formula 4:3. Frons finely colliculate with short setae. Frontal carina present from median ocellus to midlength of clypeus, forming flat point at basal clypeal margin. Scape 3.2 × as long as wide. Median ocellus anterior of tangent between upper posterior orbits of compound eyes, lateral ocelli on tangent. Occipital carina interrupted dorsally ( Fig. 6 ). Upper gena imbricate, lower gena colliculate, with dense setae, without tubercles, spines, or dorsoventral carina. Hypostomal midventral line carinate with bordering sparse and short transverse carinulae on hypostomal integument, line not angulate.

Mesosoma about 1.9 × as long as wide in dorsal view. Propodeum about 0.9 × as long as wide in dorsal view. Mesosoma imbricate ( Fig. 75 ), except propodeum reticulate (similar to pattern in Fig. 21 ), laterally more finely than dorsally. Pitted sulcus present posterior to mesoscuto-mesoscutellar sulcus. Hypersternal sulcus short, only present at omaulus. Metafemur 2.9 × 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, sparsely punctate ( Fig. 75 ). Metasomal sternum II without bulge (as in Fig. 1 ). Pygidium with medium-sized row of silk setae apically.

MALE: As in female except genitalia. Metasomal sternum VIII narrow.

Remarks. Arpactophilus nengone is most similar to A. caledonicus and A. propodealis in body form and coloration among the species with one submarginal cell. It can be distinguished from A. caledonicus by the presence of the frontal carina on the clypeus of the latter species and the more elongate head of A. nengone . The species differs from A. propodealis mainly by the shorter dorsal surface of the propodeum with a much coarser sculpturing.

Material examined. HOLOTYPE ♀: “Nouvelle Calédonie, Mont Koghis. 350m, 25.IV.1995, Réc. Chazeau & Jourdan” [ MNHN].

PARATYPES 7♀, 2♂:

♀: (1x) “Nouvelle Calédonie, Mont Koghis. 350m, 3.V.1995, Réc. Chazeau & Jourdan” [ MNHN]; (3x) “Nouvelle Calédonie, Pindaï 30m, 18.IV.1995, Réc. Chazeau & Jourdan” [ CAS]; (2x) “Nouvelle Calédonie, Mont Koghis. 350m, 25.IV.1995, Réc. Chazeau & Jourdan” [ ZMB]; (1x) “ NEW CALEDONIA: Isle of Pines: Vao; 0– 100m, I.1985; N.L.H. Krauss, Collector, BISHOP Museum” [ BPBM]; (1x) “ NEW CALEDONIA Valee d’Amoa, 7.II.1963; N.L.H. Krauss, Collector, BISHOP” [ BPBM].

♂: (1x) “Nouvelle Calédonie, Pindaï 30m, 18.IV.1995, Réc. Chazeau & Jourdan” [ MNHN]; (1x) “Nouvelle Calédonie, Mont Koghis. 350m, 25.IV.1995, Réc. Chazeau & Jourdan” [ CAS].

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

Figures

FIGURES 71 – 76. Facial views and lateral habitus of ♀ holotypes of species of Arpactophilus Smith. 71. Arpactophilus merle sp. nov., facial view; 72. A. merle, lateral habitus; 73. A. nemi sp. nov., facial view; 74. A. nemi, lateral habitus; 75. A. nengone sp. nov., facial view; 76. A. nengone, 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.