A review of the New Caledonian Arpactophilus (Hymenoptera: Crabronidae) Author Breitkreuz, Laura C. V. Author Ohl, Michael Author Engel, Michael S. text Zootaxa 2016 4063 1 1 66 journal article 37206 10.11646/zootaxa.4063.1.1 9608b695-6310-4c63-bd94-46bda058e6d8 1175-5326 270412 80401ED8-C6BA-4420-9109-854C5CC1E88D Genus Arpactophilus Smith, 1863 Arpactophilus Smith, 1863 :36 . Type species: Arpactophilus bicolor Smith, 1863 , by monotypy. Harpactophilus Kohl, 1897 :276 . Emendation of Arpactophilus Smith, 1863 . Austrostigmus Turner, 1912 :55 . Type species: Austrostigmus queenslandensis Turner, 1908 [= Stigmus queenslandensis Turner, 1908 ], by original designation. Synonymized with Arpactophilus by Bohart in Bohart and Menke, 1976 :41 , 186. Diagnosis. Representatives of the genus Arpactophilus are the only spilomenine wasps with the combination of an occipital carina that is always presently ventrally and a palpal formula never exceeding 5:4 (maxillary: labial). The occipital carina is dorsally interrupted in some species and continuous in others. The frontal carina is always present, varying from a complete carina extending from the median ocellus to the apical margin of the clypeus or may only be present on the lower 2/3 of the frons to the middle of the clypeus. The forewing may have one or two submarginal cells, and only two subdiscoidal cells. The metabasitibal plate is absent, some species have a distinctly colored and structured area apically on the metatibia. Spiniform setae are absent on the legs and pygidium, and tarsomere V is not distinctly larger than tarsomeres I–IV. The metasoma is sessile. Females lack a pygidial plate, but possess silk-secreting setae at the apex.