Exochus nigritulus Lee & Choi 2016, sp. nov.
Creators: name: Choi, Jin-Kyung
name: Kolarov, Janko
name: Lee, Jong-Wook
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Exochus
Exochus nigritulus

description: Exochus nigritulus Lee & Choi sp. nov.
(Figures 2a, 3g, 6g)
Specimens examined
Holotype: female, type depository: YNU; (South Korea) GN Hadong-gun, Hwagae-myeon, Beumwang-ri, Jirisan, Chilbulam, 20 May 1989, J.G. Kim.
Description
Female. Forewing 3.8 mm, body length 5.0 mm long.
Colour. Body including space between lateral ocellus and eye black; legs orangereddish, hind femur apically, hind tibia basally and hind tarsal segments apically weakly
darkened; hind tibia yellow on the middle, more intensively darkened apically; flagellum from below and tegula brown.
Head. Transverse, moderately narrowed behind eye. Antenna with 29 flagellomeres, first flagellomere 2.5 times as long as wide, apical segments except last one square. Frons polished, with sparse and fine punctures. Diameter of ocellus as long as distance between lateral ocellus and eye. Occipital carina weak, absent from above and from below. Temple weakly shorter than transverse diameter of eye (15: 17). Face moderately convex transversally, coarsely and densely punctured, the distance between punctures shorter than their diameter. Clypeus not separated from the face, with straight apical edge. Mandible tapered to apex, lower tooth much shorter than upper tooth. Malar space 0.62 times as long as basal width of mandible.
Mesosoma. 1.8 times as long as high in lateral view. Notaulus short but deep. Scutellum rather flat. Prepectal carina reach subtegular ridge. Pronotum and metapleuron smooth and bright, without setae or punctures. Vein Rs originating weakly from middle of pterostigma. Vein Cu-a postfurcal about half of its length. Vein cu-a of hindwing inclivous, intercepted in lower 0.25, vein Cu1 of hindwing faint. Hindwing with six distal hamuli. Legs moderately stout, hind femur 2.4 times as long as wide. Correlation between hind tarsal segments as 26: 12: 10: 8: 11. Front spur of middle tibia much shorter than hind spur. Tarsal claws simple. Propodeum without area superomedia. Area externa with hair; area superomedia and dentipara sparse hair. Area superomedia not separated from area basalis with carina, glabrous. Combined area superomedia and area basalis tapered from costula to base (Figure 6g). Area superomedia weakly wider than area dentipara. Area dentipara with long setae on hind outer angle. Propodeal spiracle 2.0 times as long as wide, closer to pleural carina than to lateral longitudinal carina.
Metasoma. Rather coarsely punctured on tergite 1, more finely punctured apically. Median dorsal carinae of tergite 1 reach its middle. Epipleuron on tergite 3 semicircular, basal three-quarters of mesal edge being strongly convex. Ovipositor sheath scarcely exposed behind tip of metasoma.
Etymology
The specific name is derived from black area (absence of yellow spots) between eye and lateral ocellus.
Distribution
South Korea.
Remarks
The species is similar to Exochus kusigematii Tolkanitz (= E. erythropus Kusigemati 1971), but it differs by the following characters: smaller number of flagellar segments, straight apical margin of clypeus, absence of yellow spots on the top of eyes, more slender hind femur and coloration of the body.
description: Published as part of Choi, Jin-Kyung, Kolarov, Janko & Lee, Jong-Wook, 2016, A taxonomic review of the genus Exochus Gravenhorst (Hymenoptera: Ichneumonidae: Metopiinae) from South Korea with descriptions of ten new species, pp. 2327-2367 in Journal of Natural History 50 on pages 2338-2339, DOI: 10.1080/00222933.2016.1197335, http://zenodo.org/record/3993034