Synergus hakonensis Ashmead, 1904

Schwéger, Szabina, Melika, George, Tang, Chang-Ti, Bihari, Péter, Bozsó, Miklós, Stone, Graham N., Nicholls, James A. & Pénzes, Zsolt, 2015, New species of cynipid inquilines of the genus Synergus (Hymenoptera: Cynipidae: Synergini) from the Eastern Palaearctic, Zootaxa 3999 (4), pp. 451-497 : 487

Synergus hakonensis Ashmead, 1904

The type female specimen labelled as ”Hakono”, ” Japan, Koebele”, red label ”Female Type No.7308 USNM”, Ashmead’s handwritten label ” Synergus hakonensis ” was examined by the authors. The type lacks one antenna but is otherwise in good condition. The species description was based on a single female (Ashmead 1904); since then nobody has referred to this species from Japan and/or the Eastern Palaearctic. Synergus hakonensis is a valid species, most closely resembling S. ishikarii and S. belizinellus by the rounded head in frontal view. In S. hakonensis the head is very delicately coriaceous, without striae and deep punctures on the frons, vertex and interocellar area; the mesoscutum is uniformly alutaceous or very delicately coriaceous, without distinct transverse interrupted striae between notauli, while in S. ishikarii and S. belizinellus the head is always with rugose sculpture, with distinct deep punctures on the frons, vertex and interocellar area, with striae on the frons; the mesoscutum with strong surface sculpture, coriaceous or rugose, with distinct elevated transverse rugae, especially in between notauli (for more diagnostic characters see also the key to species). Currently the species is known only from the one type specimen from Japan.