Ichneumon

Riedel, Matthias, 2019, Contribution to the Ichneumoninae (Hymenoptera, Ichneumonidae) of Nepal, Linzer biologische Beiträge 51 (2), pp. 1119-1162 : 1141-1143

Key to the ♀♀ of Ichneumon LINNAEUS from Myanmar and Himalayan region (adopted from HEINRICH 1965):

1 Body including legs black; only scutellum, narrow median stripes on 7 th or 6 th to 7 th tergites and upper margin of pronotum ivory. Flagellum short, filiform. Body length 15 mm. Myanmar........................................................................ I. chasmiops HEINRICH, 1965

- Body with extended ivory color pattern or metasoma partly red.........................................2

2 Very large species, body length 22-24 mm. Black; mesosoma, metasoma and legs with extended ivory coloration. Metasoma without red tergites. Myanmar............................................................................................... I. leucogigas HEINRICH, 1965

- Smaller species. Metasoma with ± red tergites....................................................................3

3 Hypostomal carina lamelliform. 1 st to 3 rd tergites with yellow apical bands. 1 st and 5 th to 7 th tergites red, apical tergites without yellow or ivory median spots. Legs completely red. Nepal............................................................................. I. cavigena nov.sp.

- Hypostomal carina not distinctly wider than genal carina. Colouration of metasoma different, usually apical tergites with distinct yellow or ivory median spots.......................4

4 All tergites red, 2 nd to 4 th tergites with black basal bands. Flagellum filiform, Mesoscutum red. Scutellum ivory or yellow. Body length 9-11 mm ..................................5

- All tergites or at least 2 nd and 3 rd tergites red, without black basal bands. Mesoscutum red or black. Body often larger............................................................................................8

5 Flagellum red basally, black distally, without ivory ring. 2 nd and 3 rd tergites with diffuse yellowish posterolateral spots, 6 th and 7 th tergites with yellow median spots. Hind coxa with sparse punctures ventrally and with weak scopa........................................6

- Flagellum with ivory ring. 2 nd and 3 rd tergites without yellow posterolateral spots ............7

6 Larger, body length 11 mm. Postpetiolus and 4 th tergite without yellow bands or spots. Postscutellum and frontal orbit reddish. Flagellum two-coloured. Himalayan region of India................................................................................ I. americanicolor HEINRICH, 1965

- Smaller, body length 9 mm. Frontal orbits with yellow stripe. Postscutellum, apical band on postpetiolus and posterolateral spots on 2 nd to 4 th tergites yellow. Flagellum tricoloured: red basally, yellowish medially and black distally. Nepal................................. ........................................................................................................... I. tricoloratus nov.sp.

7 Hind coxa with dense punctures ventrally. Upper mandibular tooth long and thick, lower tooth only indicated by a small rim at lower side of upper tooth. Mesoscutum completely red. Yellow median spots on apical tergites weak. Median field of postpetiolus striate, lateral fields punctate. Flagellum tricoloured: basal flagellomeres red, central flagellomeres with ivory rings, distal ones black. Myanmar, Nepal. .................. .......................................................................................... I. rhododendron HEINRICH, 1965

- Hind coxa mainly smooth ventrally, with few very scattered punctures. Mandible not modified: upper tooth not thickened and elongate, lower tooth smaller but distinct. Median field of mesoscutum black. 6 th and 7 th tergites with distinct ivory median spots. Postpetiolus including lateral fields striate. Flagellum black, with ivory ring centrally. Myanmar.................................................................................... I. malaisei HEINRICH, 1965

8 Postpetiolus with ivory apical band, 2 nd and 3 rd tergites with posterolateral ivory spots. Propodeum with ivory lateral spots. Mesosoma dark reddish-brown, apical tergites with median ivory spots ..............................................................................................................9

- Metasoma tricoloured, 5 th to 7 th tergites with median ivory spots. Propodeum, 2 nd and 3 rd tergites without ivory spots. Mesosoma mainly or completely black...........................10

9. Legs reddish-brown. Mesoscutum with two paramedian longitudinal ivory stripes. 5 th to 7 th tergites with median ivory spots. Metasoma semi-amblypygous: hypopygium moderately elongate. Body length 13 mm. Myanmar........... I. obtusicauda HEINRICH, 1965

- All tibiae with subbasal yellowish or ivory rings. Mesoscutum without paramedian ivory stripes. 5 th tergite black, 6 th and 7 th tergites with ivory spot. Metasoma oxypygous: hypopygium short. Body length 12 mm. Myanmar and Himalayan region ............................................................................................... I. annaelisae HEINRICH, 1965

10 All tergites red, 6 th and 7 th tergites with ivory or yellow median spots. Mesoscutum and head mainly red. ................................................................................................................11

- Only 2 nd and 3 rd tergites red; apical tergites black, with or without ivory spots ................12

11 2 nd and 3 rd tergites smooth and shining, with exceptionally scattered and fine punctures. Nepal................................................................................................. I. politoventris nov.sp.

- 2 nd and 3 rd tergites densely and coarsely rugose-punctate, ± matte. Nepal............................ .......................................................................................................... I. ruficephalus nov.sp.

12 Flagellum slender and bristle-shaped; 1 st flagellomere more than 4x longer than wide. Black; face, clypeus and gena red. Postpetiolus ± red. Small, body length 8 mm. Myanmar............................................................................. I. graciliformis HEINRICH, 1965

- Flagellum stouter, 1 st flagellomere 2-3x longer than wide. 2 nd and 3 rd tergites red, 1 st tergite black. Larger, body length 12-16 mm. ...................................................................13

13 6 th and 7 th tergites without ivory spots, at most 7 th tergite with median reddish spot ........14

- 6 th and 7 th tergites with distinct ivory median spots..........................................................15

14 Malar space 1.6x longer than width of mandibular base. Juxtacoxal carina absent. Scape, pedicle and basal flagellomeres red. 2 nd and 3 rd tergites completely red. 7 th tergite with weak reddish median spot. Hind tibia apically and hind tarsus completely black.................................................................................................. I. longigenalis nov.sp.

- Malar space 1.2x longer than width of mandibular base. Juxtacoxal carina present. Basal flagellomeres black. 2 nd tergite completely and 3 rd tergite laterally red. 7 th tergite black. Hind tibia and tarsus red ........................................................... I. creutzburgi nov.sp.

15 Head mainly black; only frons and vertical orbit, gena apically and lateral part of face reddish. Flagellum bristle-shaped, with 42 flagellomeres. Area superomedia almost square. 2 nd and 3 rd tergites completely red. Mesoscutum completely black. Body length 16 mm. Myanmar................................................................... I. indosessor HEINRICH, 1965

- Head mainly red; only stemmaticum, median frons and antennal grooves black. Flagellum filiform, with 37 flagellomeres. Area superomedia longer than wide. Body length 12-12.5 mm. ...........................................................................................................16

16 3 rd tergite red with black basal band, 5 th to 7 th tergites with ivory spots. Body length 12 mm. Myanmar........................................................................... I. ruficaput HEINRICH, 1965

- 2 nd and 3 rd tergites completely red, only 6 th and 7 th tergites with ivory spots. Body length 12.5 mm. Nepal......................................................................... I. nepalensis nov.sp.