Mesochorus (Mesochorus) riparius Schwenke, 1999

Riedel, Matthias & Varga, Oleksandr, 2022, A checklist of the subfamily Mesochorinae (Hymenoptera, Ichneumonidae) from the Ukrainian Carpathians, Zootaxa 5100 (2), pp. 224-248 : 246

Mesochorus (Mesochorus) riparius Schwenke, 1999 ( Fig. 42 )

Material examined. UKRAINE: Transcarpathian Region : 1 ♀, 6.5 km N of Mala Ugolka, 48.153958°N, 23.370084°E, 750 m, beech forest, Malaise trap 4, 8.vii–6.viii.2015 ; 1 ♀, idem, 6.viii–3.ix.2015, leg. O. Varga ( SIZK) .

Distribution. Only known from Germany; first record for Ukraine.

Taxonomical remark. This species is characterized by its very large ocelli (distance between lateral ocellus and eye 0.4 × ocellar diameter); very short temple; completely striate facial orbit; narrow ovipositor sheath; and infuscate hind coxa. The Ukrainian specimens differ slightly from the holotype (re-description see Riedel 2018b: 13): flagellum with 30 flagellomeres; hind coxa reddish-brown; 1 st tergite dark reddish basally. The specimens are otherwise typical.

Figures

FIGURES 40–43. The Carpathian Mesochorus spp. 40—M. pectinipes; 41—M. perforatus; 42—M. riparius; 43—M. terebratus.