Monoctonus inexpectatus Čkrkić, Petrović & Tomanović, sp. n.

Holotype. Female. Canada, Ontario, Wellington County, Guelph, Biodiversity Institute of Ontario, 13 VI 2013, coll. BIO Collections Staff, Malaise trap . Holotype slide mounted and deposited in CNC . Paratype: Canada, Manitoba, Riding Mountain National Park, Arrowhead Trail, 26 VI 2012, 1 female . Paratype slide mounted and deposited in FBUB. (Fig. 4 a–h)

Diagnosis. This species most resembles M. nervosus based on number of flagellomere, fore wing venation and shape of ovipositor sheath, but it can be easily distinguished based on labial palps which have 2 palpomeres (3 in M. nervosus) and shorter R1 (pterostigma length/R1 length is 3.2–3.8 in M. inexpectatus, 1.8–2.3 in M. nervosus).

Female. Head (Fig. 4a). Eyes oval, medium sized, sparsely setose. Malar space equal to 0.15 of longitudinal eye diameter. Tentorial index 0.2. Clypeus oval with 6 setae. Maxillary palps with four palpomeres, labial palps with two palpomeres. Antenna with 16 antenomeres, filiform, setae on flagellomeres semierect subequal to flagellomere diameter (Fig. 4b). Flagellomere 1 (F1) 3.7× as long as wide, without longitudinal placodes. F2 3.7× as long as wide, with 1–2 longitudinal placodes (Fig. 4c). F3, F4 and F5 with 3, 3–4 and 3–4 longitudinal placodes, respectively. F1 length equal to F2.

Mesosoma. Mesoscutum with incomplete notaulices, visible only in anterior part. Dorsal surface of mesoscutum sparsely setose in the middle (Fig. 4d). Head width/mesoscutum width ratio 1.3. Propodeum areolated, with moderately narrow central pentagonal areola (Fig. 4e).

Fore wing (Fig. 4h). Wing length 2 mm, width 0.7 mm. Stigma narrow, 6.7× as long as wide and 3.2–3.8× as long as distal abscissa of R1. Vein m-cu distinct, 2RS effaced or visible only in first half. Veins r and 3RS distinct.

Metasoma. Petiole 2.3× as long as wide at spiracles. Dorsal disc of petiole moderately rugose, especially in basal third, with 8–9 long setae on each side (Fig. 4f). Ovipositor sheath ploughshare shaped. Ovipositor sheath length/width ratio 3.15 (Fig. 4g).

Colour. Head brown, eyes black. Face with mouthparts and clypeus brownish-yellow. Scapus, pedicel and basal half of F1 yellow, remainder of antenna brown. Mesonotum brown, propodeum and legs yellowish-brown. Wings hyaline with brown venation. Petiole brown, rest of metasoma and ovipositor sheath yellowish-brown. Body length 2.6 mm.

Male. Unknown.

Host: unknown.

Distribution. Central Canada.

Etymology: The name of this species is derived from Latin inexpectatus for unexpected and refers to the surprisingly large number of new species discovered within the analysed Monoctonina material.