Arpactophilus tayo, 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 : 46-47

Arpactophilus tayo sp. nov.

( Figs. 99–100 )

Diagnosis. Arpactophilus tayo is the only New Caledonian species in the genus with the combination of a black clypeus with a medially projecting apical margin that has a shallow V-shaped incision ( Fig. 99 ), a brown mandible, a continuous occipital carina ( Fig. 5 ), two submarginal cells in the forewing, and a flat sternum II without a bulge ( Fig. 100 , and as in Fig. 1 ).

Description. FEMALE: Total length 4.6 mm; forewing length 2.9 mm.

Body black, with areas of yellow and brown. Yellow: (labrum not visible; anterior pronotal margin not visible); legs, except coxae. Brown: antenna; tegula. Wings hyaline; pterostigma brown.

Head about 0.9 × as long as wide in frontal view. Apical margin of clypeus projecting medially, medioapically with a shallow V-shaped incision ( Fig. 99 ). 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 dense and coarse prominent punctation and short setae ( Fig. 99 ). Frontal carina present from median ocellus to upper half of clypeus, slightly elevated as a ridge on upper half of clypeus. Scape 4.5 × as long as wide. Ocellar triangle anterior of tangent between upper posterior orbits of compound eyes, lateral ocelli anterior of tangent by approximately their diameter. Occipital carina continuous ( Fig. 5 ). Gena imbricate, with dense punctation and associated setae, without tubercles, spines, or dorsoventral carina. Hypostomal midventral line carinate with bordering short transverse carinulae on hypostomal integument, not angulate.

Mesosoma about 1.5 × as long as wide in dorsal view. Propodeum about 0.6 × as long as wide in dorsal view. Mesosoma imbricate, with dense punctation and associated setae ( Fig. 100 ), except on dorsal surface of propodeum; lateral surface of propodeum also coarsely reticulate; dorsal surface of propodeum coarsely reticulate (similar to pattern in Fig. 18 , but on much smaller surface). Slightly pitted sulcus present posterior to fine mesoscuto-mesoscutellar sulcus. Hypersternal sulcus long and pitted. Metafemur 2.8 × 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 much shorter than posterior border. Hind wing with five distal hamuli.

Metasoma polished, with sparse punctation ( Fig. 100 ). 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: clypeus yellow on apical half, edges of apical margin of clypeus blunt; mandible and antenna yellow. Metasomal sternum VIII narrow; forming upwardly curved ‘pseudo sting’ [form appears similar to ovipositor of female].

Remarks. Arpactophilus tayo is similar to A. caac and A. pwaamei as all have a similar body form and coloration. They can be distinguished by the basally dark brown coxae in A. tayo which is yellow in A. caac and A. pwaamei . The surface sculpture of the frons is similar in A. tayo , A. pwaamei , and A. arhoe but in A. arho the metasomal sternum II is flat without a bulge (as in Fig. 1 ) and in A. pwaamei the dorsal surface of the propodeum is longer and partially transversally carinate in addition to the aforementioned coxal coloration difference.

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

PARATYPES 2♂: “Nouvelle Calédonie, Pinda 30m, 18.IV.1995, Réc. Chazeau & Jourdan [ CAS, MNHN].

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

Figures

FIGURES 95 – 100. Facial views and lateral habitus of ♀ holotypes (except for Arpactophilus schlingeri Bohart and A. scutellaris Bohart) of species of Arpactophilus Smith. 95. A. schlingeri, facial view; 96. A. schlingeri, lateral habitus; 97. A. scutellaris, facial view; 98. A. scutellaris, lateral habitus; 99. A. tayo sp. nov., facial view; 100. A. tayo, 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.