Triclistus strobilius, Sun & Luan & Sheng, 2013

Sun, Shu-Ping, Luan, Qing-Shu & Sheng, Mao-Ling, 2013, A new species of Triclistus Foerster (Hymenoptera, Ichneumonidae, Metopiinae) parasitizing cone-borers from the Eastern Palaearctic part of China, Journal of Hymenoptera Research 30, pp. 75-82 : 76-79

Triclistus strobilius sp. n. Figures 1-8

Material.

Holotype, Female, CHINA: Beiling Park, Shenyang, Liaoning Province, reared from pupa of Dioryctria rubella Hampson, collected from cone of Pinus tabulaeformis Carr., 25 September 2009, Mao-Ling Sheng, Shu-Ping Sun. Paratypes: 1 female, same data as holotype; 1 female, CHINA: Beiling Park, Shenyang, Liaoning Province, reared from pupa of Dioryctria rubella Hampson, collected from cone of Pinus armandi Franch., 15 October 2010, Mao-Ling Sheng, Shu-Ping Sun; 1 male, CHINA: Fuxin, Liaoning Province, reared from pupa of Gravitarmata margarotana (Hein), collected from cone of Pinus tabulaeformis Carr., 20 October 2010, Qing-Shu Luan; 1 male, CHINA: Yanqing, Beijing, reared from pupa of Dioryctria pryeri Ragonot, collected from cone of Pinus tabulaeformis Carr., 9 July 2012, Tao Li; 1 female, CHINA: Jingzhou, Hunan Province, reared from pupa of Dioryctria rubella Hampson, collected from twig of Pinus massoniana Lamb., 1 June 2011, Mao-Ling Sheng.

Diagnosis.

Fore wing with areolet open. Tergites 2 - 4 ( Figure 7 ) with approximately identical punctures. Head except whitish yellow projection between antennal sockets, mesosoma, fore and mid legs, all coxae and trochanters and metasoma, entirely black. Fore femora red.

Description.

Female. Body length 8.5 - 9.5 mm. Fore wing length 6.0 - 7.0 mm.

Head. Face ( Figure 2 ) evenly, strongly convex, with large, dense punctures; upper median part with reddish brown hairs. Dorso-posterior part of upper-median projection with shallow median concavity. Clypeal suture absent. Median part of mandible convex, with distinct dense punctures, lower tooth very short and small; upper tooth long and sharp, approximately 3.0 - 3.5 times as long as lower tooth. Cheek with indistinct punctures. Malar space 0.5 - 0.6 times as long as basal width of mandible. Gena strongly and straightly convergent backwards, with dense punctures, distance between punctures 0.5 - 1.0 times diameter of puncture. Postocellar line 2.0 - 2.1 times as long as ocular-ocellar line. Frons ( Figure 3 ) with dense punctures; lower part strongly concave; dorso-posterior part of projection between antennal sockets with shallow median concavity. Antenna with 31 - 32 flagellomeres; first flagellomere approximately 1.5 times as long as second flagellomere. Occipital carina complete and strong.

Mesosoma. Anterior margin of pronotum with fine, short longitudinal wrinkles and fine, indistinct punctures; lateral concavity wide, deep, smooth, shiny; upper-posterior margin with fine, distinct punctures. Epomia strong. Mesoscutum with fine punctures, distance between punctures 0.5 - 3.5 times diameter of puncture. Notaulus indistinct. Scutellum weakly convex, with texture as that of mesoscutum. Postscutellum transverse, smooth and shiny, with fine, indistinct punctures; anterior part transversely concave. Mesopleuron ( Figure 4 ) strongly convex, with texture as that of mesoscutum; posterior part longitudinally smooth and shiny. Metapleuron almost flat, smooth and shiny, lower part with 15 - 20 hairs. Juxtacoxal carina absent. Submetapleural carina complete, triangularly convex anteriorly. Wings brownish hyaline. Fore wing vein 1 cu - a distal of 1/ M, distance between them 0.2 - 0.3 times length of 1 cu - a. Areolet open externally. 2 m - cu distal of 2 rs - m, distance between them 1.25 - 1.3 times length of 2 rs - m. Vein 2- Cu 3.0 - 4.0 times as long as 2 cu - a. Hind wing vein 1/ cu 4.0 - 5.0 times as long as cu - a. Front femur ( Figure 5 ) particularly swollen, with fine, sparse punctures. Ratio of length of hind tarsomeres 1:2:3:4:5 is 10.0:4.3:3.1:1.5:2.3. Hind fifth tarsomere without subapical hook-shaped thorn. Propodeum ( Figure 6 ) almost evenly convex, smooth and shiny, lateral sides and area petiolaris with fine, indistinct punctures, carinae complete and strong. Area superomedia separated from area basalis and from area petiolaris by strong carina, costula located slightly before its middle. Propodeal spiracle obliquely elongate, approximately 2.5 - 3.0 times as long as maximum width, almost touching pleural carina.

Metasoma. First tergite with even punctures between median dorsal and dorsolateral carinae, smooth and shiny between median dorsal carinae; slightly longer than apical width, weakly convergent towards sub-base, combined points of median dorsal and dorsolateral carinae projecting as lower horns, abruptly narrowed towards base of tergite. Median dorsal carinae long and strong, reaching 0.7 - 0.8 length of tergite. Dorsolateral and ventrolateral carinae complete. Tergites 2 - 4 ( Figure 7 ) and anterior half of tergite 5 with symmetrical punctures, lateral sides almost parallel. Tergite 2 approximately 0.78 - 0.8 times as long as apical width. Tergite 3 approximately 0.67 - 0.7 times as long as apical width. Posterior half of tergite 5 and following tergites ( Figure 8 ) with indistinct fine punctures. Posterior part of tergite 8 smooth and shiny. Apical margin of subgenital plate obtuse, without distinct apical-median concavity.

Color. Body almost entirely black ( Figure 1 ). Upper median projection of face between antennal sockets whitish yellow. Upper margin of face faintly brown. Vertex above eye with small yellowish brown spot. Median part of mandible dark-reddish-brown. Front femora red. Apical part of front tibiae reddish brown. Front first tarsomere, apices of mid and hind tibiae, fourth and fifth tarsomeres dark red to blackish brown. Pterostigma and veins brownish black.

Male. Body length 9.0-9.5 mm. Fore wing length 6.5-7.0 mm. Upper-posterior margin of pronotum more or less yellow.

Hosts.

Dioryctria rubella Hampson, Dioryctria pryeri Ragonot ( Lepidoptera , Pyralidae ); Gravitarmata margarotana (Hein) ( Lepidoptera , Tortricidae ).

Host plants.

Pinus massoniana Lamb., Pinus armandi Franch., Pinus tabulaeformis Carr. ( Pinaceae ).

Etymology.

The name of the new species is based on the host food.

Remarks.

Similar to Triclistus nigrifemoralis Kusigemati 1971, but can be easily distinguished from the latter in having the areolet open externally; area superomedia ( Figure 6 ) smooth and shiny, anterior side wide, separated from area basalis by distinct carina; third tergite without bare part, entirely with symmetrical hairs; hind tibia entirely black. Triclistus nigrifemoralis Kusigemati 1971 has the areolet closed externally; area superomedia rugose, strongly narrowed anteriorly, confluent with area basalis; third tergite bare medially, sparsely hairy laterally and basal 1/3 of hind tibia yellowish brown.

Figures

Figures 1 - 8. Triclistus strobilius, sp. n. Holotype, female. 1 Habitus, lateral view 2 Head, anterior view 3 Frons 4 Mesopleuron 5 Fore femur 6 Propodeum 7 Tergites 1 - 4 8 Posterior part of metasoma, lateral view.