A new species of Campoletis Förster (Hymenoptera, Ichneumonidae) with a key to species known from China, Japan and South Korea

Abstract A new species of the genus Campoletis Förster, 1869, C. deserticola Sheng & Zhou, sp. nov., collected from Zhangwu, Liaoning Province and Songshan National Natural Reserve, Yanqing, Beijing, China, is described and illustrated. A taxonomic key to the species of Campoletis known in China is provided.

The Western Palaearctic species of Campoletis were revised by Riedel (2017); subsequently, three new species of Campoletis have been described by Vas (2019a, b) from Mongolia and South-Eastern Europe. Prior to this publication seven species of Campoletis had been known from China (Kokujev 1915;Uchida 1957;Kusigemati 1990;He et al. 1996;Sheng and Sun 2014).
The Project "Research Station of Liaohe-River Plain Forest Ecosystem, Chinese Forest Ecosystem Research Network", set in the desert area in Liaoning Province, has being undertaken by Y-WW's research group since 2014. One of the purposes of the investigation is recording biodiversity. Large numbers of ichneumonids were collected and in the present research, a new species of Campoletis is described which was collected in the desert. With paratypes collected from Yanqing, Beijing, it is described and illustrated herein, and compared with its congeners.
Morphological terminology is mostly based on Broad et al. (2018). Images were taken using a Leica M205A stereo microscope with LAS Montage MultiFocus. Type specimens are deposited in the Insect Museum, GSFGPM. Inner margin of eye slightly indented opposite antennal socket. Apical margin of clypeus usually with a median tooth. Lower margin of mandible with narrow lamella, lower tooth of mandible slightly narrower than upper tooth, same length or slightly shorter. Malar space 0.5-1.0× as long as basal width of mandible. Areolet receiving 2m-cu usually basad of middle. Nervellus intercepted; discoidella almost unpigmented, reaching nervellus. Lateral suture between tergite 1 and sternite 1 distinctly below mid-height. Glymma present and deep. Ovipositor 1.6 to 3.5 as long as apical depth of metasoma.
Coloration (Fig. 2). Black, except for following: mandible except teeth yellow brown. Apical three segments of maxillary palpi, tegulae and lateral margins of tergite 7 brown. Femora, sides of fore tibia (Fig. 9), hind tibia (Fig. 10) except base, main portion of tergite 2, tergites 3 and 4 and anterior portion of tergite 5 brownish red. Inner side of fore tibia and fore tarsus yellowish brown. Mid tarsus brown. Base of hind tibia and tarsus brownish black. Pterostigma and veins brown.
Distribution. China: Beijing, Liaoning. Etymology. The specific name is derived from the habitat of the holotype locality.

Remarks.
The new species is similar to Campoletis gastrolinae Kusigemati, 1972 andC. cognata (Tschek, 1871) in having the head and mesosoma black; tergites 2-3 red to reddish brown; hind femur completely or predominantly red; apical margin of clypeus with strong median tooth; second tergite approximately as long as (C. cognata at most 1.2×) posterior width. It can be distinguished from C. gastrolinae by the following combination of characters: frons without median longitudinal carina; notaulus absent; areolet receiving vein 2m-cu distinctly basal of its middle; Area superomedia and area petiolaris confluent; ovipositor sheath 1.1-1.2× as long as second tergite; coxae entirely black; tergites 6-8 mainly black. C. gastrolinae has the frons with median longitudinal carina; notaulus extending to the middle of the mesoscutum; the areolet receiving vein 2m-cu is placed at its middle; Area superomedia and area petiolaris separated by distinct carina; the ovipositor sheath is 0.8× as long as the second tergite; fore and mid coxae yellow; tergites 6-8 partly yellowish brown.
The new species can be distinguished from C. cognata by the following couplet inserted into Riedel's (2017) Identification key:

34
Prepectal carina angled in the area of the sternaulus and divided into a transverse and pleural part, both similar; genal carina obliterated ventrally; ovipositor sheath c. 0.9-1.2× longer than the first tergite; fore tibia leaner, more than 6× longer than wide (as fig. 46