Casinaria Holmgren, 1859

Han, Yuan-Yuan, Achterberg, Kees Van & Chen, Xue-Xin, 2021, The genus Casinaria Holmgren, 1859 (Hymenoptera: Ichneumonidae, Campopleginae) from China, Zootaxa 4974 (3), pp. 504-536 : 505-506

Key to species of Casinaria Holmgren from China

1. Nervellus not intercepted; propodeum usually without distinct carina; sometimes only the basal carina or irregular median longitudinal carina present; temple usually not swollen below, but receding dorsally immediately behind eyes; first metasomal tergite always longer than second tergite................................................................... 2

-. Nervellus intercepted; propodeum with distinct or indistinct median carina and usually other carinae also present; temple dorsally not receding, but sometimes ventrally receding; first tergite usually as long as second tergite.................... 19

2. First metasomal segment long and slender, largely cylindrical, longer than hind femur; hind femur long, slender and not widened medially; propodeum long, strongly apically produced and extending up to more than 0.75× length of hind coxa; propodeum strongly reticulate; frons with a median carina; scutellum flattened and laterally carinate; hind coxa rugulose........ 3

-. First metasomal segment comparatively stouter, either as long as or short than the hind femur; hind femur usually widened medially and stout; propodeum not strongly apically produced and not extending beyond middle of hind coxa; propodeal sculpture variable; frons without a median carina; scutellum a little convex, not laterally carinate; hind coxa weakly sculptured...... 4

3. Mesopleuron below subtegular ridge irregularly and coarsely wrinkled; fore trochanter and base of fore femur always blackish brown; face striate-rugose centrally.................................. C. pedunculata pedunculata (Szépligeti, 1908)

-. Mesopleuron below subtegular ridge finely trans-striate; fore leg wholly yellowish brown with coxa darker; face rugose, not striate-rugose centrally.................................................. C. ajanta Maheshwary & Gupta, 1977

4. Frons and vertex finely rugose; clypeus rugose; eyes on the inner side weakly indented; third to fifth metasomal segments yellowish red; tegulae yellowish brown........................................... C. matsuyamensis (Uchida, 1928)

-. Frons and vertex granulate to punctate; clypeus not rugose; eyes on the inner side indented to strongly indented and other characters not exactly same................................................................................. 5

5. Basal carina distinct and removed from base of propodeum, basal propodeal area trapezoid; speculum shiny; antenna with 39–41 flagellomeres..................................................................... C. remota sp. nov.

-. Basal carina distinct or not distinct and not away from base of propodeum, basal propodeal area almost rectangle or absent; speculum shiny or mat; antenna usually with less than 39 flagellomeres.......................................... 6

6. Propodeum rugose-reticulate, median groove deep, strongly trans-striate; metapleuron rugulose to rugose-reticulate; first metasomal segment nearly as long as hind femur; basal transverse carina of propodeum distinct or indistinct; second recurrent vein emitted distinctly from middle or after middle of areolet...................................................... 7

-. Propodeum not rugose-reticulate, median groove shallow and not strongly sculptured; metapleuron mat to rugulose-punctate; first metasomal segment stouter and usually shorter than hind femur; basal transverse carina of propodeum indistinct; second recurrent vein emitted from middle of areolet.............................................................. 15

7. Malar space 0.8× as long as basal width of mandible; speculum polished; basal area of propodeum absent............................................................................................. C. albibasalis Uchida, 1928

-. Malar space less than 0.7× basal width of mandible; speculum usually mat; basal area of propodeum present............. 8

8. Metasoma wholly black, metapleuron rugulose-punctate, juxtacoxal carina distinct...................... C. xui sp. nov.

-. Metasoma partly or largely yellowish brown to reddish brown, metapleuron mat to rugose-punctate, juxtacoxal carina absent to distinct............................................................................................. 9

9. Malar space 0.5–0.7× basal width of mandible; metasoma largely black with third and fourth or also fifth metasomal tergite reddish brown (except C. exiloides sp. nov.)............................................................... 10

-. Malar space 0.2–0.4× basal width of mandible; metasoma reddish beyond second tergite............................ 13

10. Face and clypeus rugose; mesopleuron granulate-punctate above................................. C. exiloides sp. nov.

-. Face and clypeus rugulose to granulate-rugulose; mesopleuron granulate to granulate-rugulose above................. 11

11. Propodeum elongate, horizontal dorsally; hind femur reddish brown........... C. simillima Maheshwary & Gupta, 1977

-. Propodeum normal, slanted dorsally; hind femur blackish brown............................................... 12

12. Propodeum with a distinctly regular medio-longitudinal carina; interocellar distance 2.5× ocello-ocular distance; antenna with 30–33 flagellomeres; second recurrent vein emitted distinctly after middle of areolet; hind tibia white basally................................................................................................ C. albifunda sp. nov.

-. Propodeum with a indistinctly irregular medio-longitudinal carina; interocellar distance 2.1× ocello-ocular distance; antenna with 39–40 flagellomeres; second recurrent vein emitted from middle of areolet or slightly behind middle; hind tibia yellowish brown basally and medially................................................... C. nigripes (Gravenhorst, 1829)

13. Face granulate-rugulose; speculum mat and with finely striate; metapleuron rugulose; propodeum with medio-longitudinal carina absent.......................................................................... C. artivultis sp. nov.

-. Face rugose; speculum smooth and shiny; metapleuron rugose-punctate; propodeum with medio-longitudinal carina wavy. 14

14. Mid and hind trochanters, hind femur and tegulae black; malar space mat; mandible without a distinct lamella; second recurrent vein emitted from little beyond middle of areolet............................ C. buddha Maheshwary & Gupta, 1977

-. Mid and hind trochanters, hind femur and tegulae yellowish brown; malar space smooth and shiny; mandible with a distinct lamella; second recurrent vein emitted distinctly beyond middle of areolet............................ C. exilis sp. nov.

15. Malar space 0.3× basal width of mandible; face finely rugose-punctate; metapleuron granulate-punctate....................................................................................... C. tenuiventris (Gravenhorst, 1829)

-. Malar space 0.5–0.75× basal width of mandible; face granulate-rugulose to rugose; metapleuron sparsely punctate to weakly rugose............................................................................................. 16

16. Hind femur yellowish brown; pronotum rugulose to rugulose-punctate posteriorly; scutellum rugulose to rugose......... 17

-. Hind femur blackish brown; pronotum rugose posteriorly; scutellum finely rugose-punctate.............................................................................................. C. arjuna Maheshwary & Gupta, 1977

17. Interocellar distance 1.1–1.3× ocello-ocular distance; mandible black, except teeth; tegulae brown; metasoma wholly black.......................................................................................... C. hei sp. nov.

-. Interocellar distance 1.7–2.0× ocello-ocular distance; mandible yellow, except teeth; tegulae yellow; metasoma yellowish brown after second segment or with apical metasomal tergites black............................................ 18

18. Upper half of mesopleuron granulose; metapleuron with minute punctures; male genital claspers rod-like apically; interocellar distance 1.7× ocello-ocular distance; malar space 0.5× basal width of mandible..... C. formosana formosana Momoi, 1970

-. Upper half of mesopleuron granulate-rugulose; metapleuron weakly rugose; male genital claspers broad apically; interocellar distance 2.0× ocello-ocular distance; malar space 0.6× basal width of mandible... C. ashimae Maheshwary & Gupta, 1977

19. Interocellar distance longer than ocello-ocular distance; metasoma completely black; basal carina of propodeum close to its base; basal area of propodeum rectangular, short and broad; first abscissa of subdiscoideus 1.1–1.4× length of second abscissa; metasoma normal, segments not constricted; antenna short, stouter and widened subapically......................... 20

-. Interocellar distance equal to ocello-ocular distance; metasoma partly black and partly yellowish brown; basal carina distinctly removed from base of propodeum; basal area of propodeum trapezoidal, long and narrow; first abscissa of subdiscoideus 1.4–1.7× length of second abscissa; third to fifth metasomal segments constricted at joints (especially third segment); antenna long, thin and not widened subapically..................................... C. varuni Maheshwary & Gupta, 1977

20. Apex of clypeus truncate; malar space 0.4–0.5× basal width of mandible; interocellar distance 1.5× diameter of ocellus; basal carina, median and lateral longitudinal carina, costulae and apical transverse carina of propodeum all strong; nervellus intercepted at lower 0.1; first metasomal segment 1.5× second segment length, shorter than hind leg; metasoma thick cylindrical................................................................................... C. partolstoyi sp. nov.

-. Apex of clypeus convex; malar space 0.2–0.3× basal width of mandible; interocellar distance 1.0–1.2× diameter of ocellus; at most basal carina of propodeum strong, others weakly developed; nervellus intercepted at lower 0.25; first metasomal segment equal to length of second segment and hind leg; metasoma thin cylindrical....................................... 21

21. Interocellar distance 1.4× ocello-ocular distance; medio-longitudinal carina distinct; thyridium drop-shaped; whole body black............................................................................... C. melasoma sp. nov.

-. Interocellar distance 2.0× ocello-ocular distance; medio-longitudinal carina absent to indistinct; thyridium circular; only part of body black......................................................................................... 22

22. Hind femur and tibia black except a yellow subdorsal stripe on tibia; malar space 0.30× basal width of mandible............................................................................... C. leo leo Maheshwary & Gupta, 1977

-. Hind femur reddish brown, with apex blackish; hind tibia distinct banded subbasally and apically, yellowish centrally; malar space 0.25× basal width of mandible................................ C. leo rufipedalis Maheshwary & Gupta, 1977