Mesochorus caucasicus, Riedel, 2018

Riedel, Ravenhorst Matthias, 2018, Contribution to the Palaearctic species of Mesochorus G (Hymenoptera, Ichneumonidae, Mesochorinae): 1. The M. fulvus-group, Linzer biologische Beiträge 50 (1), pp. 687-716 : 690

publication ID	https://doi.org/ 10.5281/zenodo.4031076
persistent identifier	https://treatment.plazi.org/id/03DA87AD-FF90-1264-FDF8-FE9DFBF08380
treatment provided by	Admin
scientific name	Mesochorus caucasicus
status

Treatment

♂♂ ( for Mesochorus caucasicus nov.sp., M. fulvoides nov.sp., M. lapponator nov.sp. and M. pseudolapponicus nov.sp. unknown)

1 Pterostigmas brownish. Claspers pointed apically .............. M. lapponicus View in CoL THOMSON, 1885

- Pterostigmas hyaline or hyaline-ochreous ...........................................................................2

2 Claspers pointed apically ( fig. 51 View Figs 46-51 ). Propodeum - seen from lateral - strongly arched ( fig. 48 View Figs 46-51 ). Area petiolaris large, its length about half the length of propodeum...................... ......................................................................................................... M. propodealis nov.sp.

- Claspers blunt or slightly clubbed apically. Propodeum rounded. Area petiolaris distinctly shorter than half the length of propodeum ...........................................................3

3 Lower mandibular teeth larger than the upper ones. Area superomedia very slender, length>3xwidth ( fig. 15 View Figs 14-17 ) ................................................ M. fulgurator View in CoL HORSTMANN, 2006

- Mandibles with equal teeth. Area superomedia stouter, length <2.7x width .......................4

4 Claws long and strongly falcate apically ( fig. 42 View Figs 39-45 ). Subbasal cells of front wings bare in proximal half ( fig. 40 View Figs 39-45 ) ................................................................ M. pelvis View in CoL SCHWENKE, 2002

- Claws normally bent. Subbasal cells of front wings with at least scattered hairs................5

5 Genal carinae reaching the hypostomal ones close to mandibular bases. Hind femora slender, about 6x as long as wide ....................................... M. agnellonis View in CoL SCHWENKE, 1999

- Genal carinae reaching the hypostomal ones far from mandibular bases. Hind femora usually stouter .....................................................................................................................6

6 Ocellismaller, OOD 0.8-1.2 ( fig. 12 View Figs 9-13 )..................................................................................7

- Ocelli larger, OOD 0.5-0.7 ( fig. 22 View Figs 18-24 )....................................................................................8

7 Temples roundly narrowed behind eyes, length 0.5-0.6x eye width. OOD 0.8-1.0. Face narrower, width 0.8x eye length, usually with parallel sides................................................. .......................................................................................... M. britannicus View in CoL SCHWENKE, 1999

- Temples slightly widened behind eye, narrowed apically, length c.0.8x eye width. OOD 1.2. Face wide, width 1.0x eye length, with slightly divergent sides ventrally ............ ....................................................................................................... M. flavoorbitalis nov.sp.

8 Temples longer, length 0.8-1.0x eye width. Claspers longer, length c.1.4x length of 2 nd hind tarsomeres .............................................................................. M. laricis View in CoL HARTIG, 1838

- Temples shorter, strongly rounded behind eyes. Claspers shorter, c.1.1-1.2x length of 2 nd hind tarsomeres..................................................................... M. fulgurans View in CoL CURTIS, 1833