Lutnes Cameron, 1884

Gibson, Gary A. P., 2018, Revision of Lutnes Cameron (Hymenoptera: Eupelmidae), Zootaxa 4415 (2), pp. 330-356 : 336

Key to species of Lutnes Cameron

1 Head in lateral view high-triangular with frontovertex ( Fig. 4: fvt) acutely angled relative to face ( Fig. 4: fa); scrobal depression wider than high ( Fig. 3) and continuously carinate between inner orbits ( Figs 3, 5); fore wing with costal cell bare dorsally and disc with only one hyaline region with white setae behind marginal vein ( Fig. 8); propodeum with foramen incurved virtually to v-like emarginate anterior margin and callar region similarly strongly sculptured on either side of only obscurely developed postspiracular groove ( Fig. 6: psg); flagellum dark except fl3 and fl4 yellowish, and fl5–fl8 strongly transverse such that combined length shorter than length of clava ( Fig. 7) (Afrotropical)......................... Lutnes afrotropicus n. sp.

- Head in lateral view lenticular to low-triangular with frontal surface almost evenly curved or frontovertex only obtusely angled relative to face ( Figs 11, 20, 29, 50, 51); scrobal depression higher than wide and not carinately margined below anterior ocellus ( Figs 13, 39, 46, 47); fore wing with costal cell setose dorsally and more hyaline regions of disc lacking white setae ( Fig. 34) or with both anterior and posterior hyaline regions with white setae behind marginal vein ( Figs 16, 25, 41, 52, 53); propodeum with foramen obviously separated from anterior margin, and callar region with more strongly sculptured mesal region separated from smooth and shiny or only faintly sculptured lateral region by postspiracular groove extending from spiracle to foramen (e.g. Figs 17, 26, 58: psg); flagellum variable in colour pattern, but at least fl5–fl8 subquadrangular to slightly longer than wide such that combined length obviously greater than length of clava ( Figs 12, 24, 33) (Neotropical)............. 2

2(1) Brachypterous ( Figs 28, 29), with fore wing disc somewhat more hyaline but with entirely dark setae behind marginal vein ( Fig. 34).......................................................................... Lutnes infucatus n. sp.

- Macropterous ( Figs 11, 38, 50) or, if brachypterous ( Figs 20, 51), fore wing disc with anterior ( Fig. 53) or both anterior and posterior hyaline regions ( Figs 25, 41, 52) with white setae behind marginal vein................................... 3

3(2) Fore wing disc with setae entirely dark except for white setae in hyaline regions ( Figs 25, 41)......................... 4

- Fore wing disc with region of orangish setae at least behind marginal vein basally ( Figs 10, 16) and sometimes more extensively in addition to white setae in hyaline regions ( Figs 48, 50, 52).............................................. 5

4(3) Brachypterous, with slender fore wing ( Fig. 25) extending only to about mid-length of gaster ( Figs 19, 20); flagellum entirely brown ( Fig. 24); all legs with femora and tibiae brown except for slightly paler knees ( Fig. 20); gaster with Gt5 at least broadly reticulate laterally, the sculptural cells concave and delineated by ridges ( Fig. 27)............ Lutnes biguttatus (Girault)

- Macropterous, with apically broadened fore wing ( Fig. 41) extending to apex of gaster ( Figs 37, 38); flagellum with at least apical four funiculars orangish ( Fig. 38); middle and hind legs with knees distinctly white and at least mesotibia with variably long pale region mesally to subapically or apically ( Fig. 38); gaster with Gt5 entirely granular, the sculptural cells convex and delineated by grooves ( Fig. 44).................................................. Lutnes ornaticornis Cameron

5(3) Mesosoma dark with green to bluish or purple lusters, not contrasting distinctly with head ( Figs 10, 11, 14, 15); legs extensively dark, including all femora and outer surface of metatibia ( Fig. 11); macropterous ( Figs 10, 11), with fore wing having distinct region of orangish setae behind marginal vein basally ( Figs 10, 16) and sometimes variably large region of orangish setae apically near stigmal vein, but at least anterior and posterior hyaline regions separated by dark brown setae extending from base of parastigma; propodeum with plical region medially obviously less than half as long as scutellum ( Fig. 17); antenna, excluding scape, dark except fl4–fl6 or fl4–fl7 pale ( Fig. 12).................... Lutnes aurantimacula n. sp.

- Mesosoma mostly to entirely orangish-yellow to orange in distinct contrast to variably metallic but dark head ( Figs 51, 55) (at most mesoscutum ( Figs 48, 54) and/or mesopectus and acropleuron anteriorly to level about equal with apex of tegula ( Fig. 56)