Lathrolestes

Reshchikov, Alexey V., 2013, Two new species of Lathrolestes (Hymenoptera, Ichneumonidae) from Norway, northern Russia and Finland with a key to western Palaearctic species, Zootaxa 3681 (1), pp. 59-72 : 60-69

Key to European species of Lathrolestes

1. Occipital carina complete (Fig. 1a)....................................................................... 2

- Occipital carina incomplete dorsally (Fig. 1b).............................................................. 19

2. Propodeum without carinae or with only area petiolaris obliterated anteriorly (Fig. 2b).............................. 3

- Propodeum with carinae more or less complete (Fig. 2a)...................................................... 6

3 Apical margin of clypeus truncated; clypeal foveae large (Fig. 3b). Head rather narrowed behind eyes. Head and lower part of mesopleuron with distinct sparse punctures; metasomal tergites with fine deep punctures. Face, clypeus, malar space, pronotum, lower part and upper edge of mesopleuron, fore edges of mesonotum, tegulae, legs (except middle and hind tarsi) and lateral parts of metasomal tergites yellow (Fig. 3bb)...................................... L. zoticus Reshchikov, 2011

- Apical margin of clypeus rounded; clypeal foveae small or large (Fig. 3a). Head weakly narrowed behind eyes or not narrowed. Head and lower part of mesopleuron granulated, without distinct punctures or with rugosity. Metasomal tergites smooth. Colouration different (Fig. 3aa).................................................................... 4

4 Ovipositor shorter than metasoma, almost as long as first metasomal tergite, without nodus, with subapical dorsal notch; lower valve without teeth at apex (Fig. 4b). Malar space 0.35 times as long as basal mandibular width. Head narrowed behind eyes. Areolet open. In female clypeus, malar space, spots on orbits near antennal sockets and on top of eyes yellow; mesoscutum black; hind legs mostly reddish; metasoma beyond first tergite reddish or pale brownish; in male face yellow........................................................................................... L. verticalis (Brischke, 1871)

- Ovipositor longer than metasoma, curved above, upper valve with nodus and without subapical dorsal notch at apex; lower valve with distinct teeth at apex (Figs 4a). Malar space as long as basal mandibular width. Head not narrowed behind eyes. Areolet closed. Colouration different...................................................................... 5

5 Head broad behind eyes. Clypeus distinctly separate from face (Fig. 5b). Lower part of mesopleuron without rugosity. Face, clypeus and mesosoma black with reddish-yellow maculae; face yellow; mesoscutum with 4 yellow longitudinal bands; metasomal tergites of females yellow-reddish, except first tergite black, reddish-yellow at apex, that of males black, except second and third tergites with broad pale yellow transverse macula................................ L. ensator (Brauns, 1898)

- Head not broad behind eyes. Clypeus not separated from face by transverse groove (Fig. 5a). Lower part of mesopleuron with rugosity. Body brownish, legs and maculae on head yellowish.......................... L. acinaces Reshchikov, 2011

6 Face and clypeus separated by impression (Fig. 6a)........................................................... 7

- Face and clypeus separated by a distinct transverse groove (Fig. 6b)............................................ 14

7 Propodeum with carinae partly present (Fig. 7a)............................................................. 8

- Propodeum with carinae complete (Fig. 7b)............................................................... 10

8 Face entirely yellow (Fig. 6a). Head and mesopleuron granulate, matt, rather finely and densely punctate (Fig. 8a). Area super- omedia elongate, narrow and fused with area basalis, area apicalis short (Fig. 7a).......... L. orbitalis (Gravenhorst, 1829)

- Face mostly dark or only medially dark. Head and mesopleuron not so distinctly and densely punctate (Fig. 8b)........... 9

9. Mesopleuron weakly punctate, polished (Fig. 8b). Body brownish, face entirely brownish, legs yellowish................................................................................................... L. laevipleuris sp. nov.

- Mesopleuron sparsely and distinctly punctuate, matt. Middle of face in male yellow, metasoma partly reddish; upper part of hind tibia dark.............................................................. L. moravicus (Habermehl, 1923)

10. Head large, very swollen (temples 1.5–2 times as long as eye diameter in profile). Head and mesopleuron matt, coarsely, densely and rather evenly punctate....................................................................... 11

- Head not so large. Head and mesopleuron shiny, polished or finely granulate, almost impunctate...................... 13

11. Tegulae brownish. Head mostly orange (Fig. 9a). Second recurrent vein intercepting areolet at its middle...................................................................................... L. erythrocephalus (Gravenhorst, 1829)

- Tegulae yellow. Head mostly black (Fig. 9b). Second recurrent vein intercepting areolet behind its middle............... 12

12. First metasomal tergite twice as long as wide (Fig. 10b). Face in female black (Fig. 9b)..... L. buccinator (Holmgren, 1857)

- First metasomal tergite less than twice as long as wide (Fig. 10a). Face in female yellow (Fig. 10a).................................................................................................. L. tripunctor (Thunberg, 1824)

13. Hind tibia dark, with pale ring at base. Propodeum short with high vertical hind part...... L. albicinctus (Habermehl, 1922)

- Hind tibia reddish-yellow with dark apex. Propodeum not so short and vertical........... L. luteolator (Gravenhorst, 1829)

14. Propodeum with complete carinae (Fig. 11b)............................................................... 15

- Propodeum with carinae partly present (Fig. 11a)........................................................... 16

15. Hind femur and metasoma brown. Frons with yellow orbits, reddish-yellow spots at upper part of temple (in holotype) (Fig. 6b)........................................................................ L. bipunctatus (Bridgman, 1886)

- Hind femur yellow-reddish. Orbits entirely yellow..................................... L. pictilis (Holmgren, 1857)

16. Ovipositor up-curved. Clypeus strongly projecting anteriorly........................... L. clypeatus (Zetterstedt, 1838)

- Ovipositor straight. Clypeus not projecting strongly anteriorly................................................ 17

17. Tarsus mostly dark, apical tarsal segments slightly enlarged. Propodeal areas partly present. Last visible metasomal tergite not modified.................................................................... L. nigricollis (Thomson, 1883)

- Fifth article of tarsus dark and enlarged (Fig. 12). Only one transverse propodeal carina present (Fig. 11a). Last visible tergite of metasoma modified in projection..................................................................... 18

18. Basal transverse carina of propodeum evenly arched; area supeomedia absent (Fig. 11a). Apical area open anteriorly (Fig. 11a), propodeum with rough sculpture (Fig. 11a). Mesopleuron and metasoma shagreened, matt. Teeth of claws not slanted. Maculae on face and behind eyes not fused in single yellow band, notum and postscutellum black, metasomal tergites with hind margin narrowly reddish-yellow........................................................ L. ungularis (Thomson, 1883)

- Basal transverse carina of propodeum forms costula and anterior part of area superomedia that is pointed anteriorly (Fig. 13b). Sculpture of propodeum smooth. Mesopleuron and metasoma slightly shagreened, polished (Fig. 13bb). Teeth of claws vertical and large (Fig. 13bbb). Orbits completely and widely yellow, parapsidial part of notum reddish-yellow, postscutellum yellow, metasomal tergite with hind margin widely reddish-yellow.............................. L. fascialis Reshchikov, 2011

19. Malar space as long as width of base of mandibles (Fig. 14a). Body mostly pale yellow except black first metasomal tergite (Fig. 14aa)..................................................................... L. luteolus (Thomson, 1883)

- Malar space shorter than width of base of mandibles (Fig. 14b); body mostly black (Fig. 14bb)....................... 20

20. Head swollen, not narrowed behind eyes. Antenna with 28–30 flagellomeres. Fore wing 5–6 mm ...................... 21

- Head narrowed behind eyes. Antenna with 21–28 flagellomeres. Fore wing 3–4 mm ................................ 22

21. Face strongly convex (Fig. 15a). Claws not pectinate (Fig. 15aa). Ovipositor straight, its sheath about 0.3 metasomal height at apex (Fig. 15aaa). Parameres elongate (Fig. 15aaaa). Metasomal tergites with narrow yellow margin (Fig. 14bb)....................................................................................... L. lucidulus (Holmgren, 1857)

- Face not strongly convex (Fig. 14b). Claws pectinate. Ovipositor longer and slightly up-curved; tip of its upper valve with nodus (Fig. 15b). Parameres elongate but wide. Metasoma mostly black (Fig. 15b)........... L. caudatus (Thomson, 1883)

22. Carinae of propodeum partly present, area petiolaris present. Areolet rhombic, open. Claws pectinate. First metasomal tergite bordered by longitudinal carinae, with projecting at spiracles. Parameres large, projecting beyond metasoma (Fig. 16a). Ovipositor straight, with subapical notch.................................................... L. saliceti (Roman, 1909)

- Carinae of propodeum absent, area petiolaris not present. Areolet petiolate. Parameres elongate and wider apically (Fig. 16b). Ovipositor slightly up-curved or straight and stout........................................................... 23

23. Clypeus projecting distinctly anteriorly, but not strongly, not incurved........................................... 24

- Clypeus strongly projecting anteriorly, incurved............................................................ 26

24. Third metasomal tergite reddish-yellow at base and at apex (Figs 16b, 17a).............. L. macropygus (Holmgren, 1857)

- Metasomal tergites black (Figs 17b, 17c)................................................................. 25

25. Tarsal claws pectinate, teeth shorter than apical tooth. Hind femur yellowish (Fig. 18a)....... L. pleuralis (Thomson, 1883)

- Tarsal claws pectinate, teeth as long as apical tooth. Almost hind femur black (Fig. 18b)....... L. nornae Reshchikov , sp. n.

26. Tarsal claws pectinate at base. Mesosoma with pale yellow maculae. Base of antennae and clypeus pale................................................................................................... L. morator Aubert, 1984

- Tarsal claws not pectinate at base. Mesosoma black. Base of antennae and clypeus dark........... L. occultor Aubert, 1984