Nomada ruficornis (Linnaeus, 1758)

Lim, Kayun & Lee, Seunghwan, 2023, A key to species of Nomada ruficornis species-group (Hymenoptera: Apidae) of South Korea, with descriptions of three new species, Zootaxa 5228 (1), pp. 44-60 : 56-58

Key to South Korean species of Nomada ruficornis species-group (modification following Mitai & Tadauchi 2007; Won & Kim 2013; Smit 2018)

Females

1. HTS absent......................................................................................... 2

– HTS present......................................................................................... 3

2. Antennae entirely black, paraocular area predominantly black, sometimes with smear amber line on the margin............................................................................................ Nomada esana Tsuneki

– Antennae entirely yellow anteriorly, dark brown posteriorly, paraocular area tinged with bright yellow............................................................................................... Nomada tsunekiana Schwarz

3. HTS long and as thin as hair on hind tibiae................................................................. 4

– HTS length variable and thicker than hair on hind tibiae except long and thin posteriormost seta....................... 7

4. HTS 4 in number, evenly distributed with space............................................................. 5

– HTS more than 10 in number without distinct space.......................................................... 6

5. Propodeal triangle dark orange with median thick black line......................... Nomada sabaensis Tsuneki 1973

– Propodeal triangle entirely black....................................... Nomada shirakii Yasumatsu & Hirashima

6. HTS curved, equal in length..................................................... Nomada harimensis Cockerell

– HTS straight, short gradually........................................................ Nomada pacifica Tsuneki

7. HTS spathulate.................................................................. Nomada aswensis Tsuneki

– HTS not spathulate.................................................................................... 8

8. Scutellum black............................................................. Nomada atra Lim & Lee , sp.n.

– Scutellum reddish or bright yellow....................................................................... 9

9. Scutellum tinged with bright yellow..................................................................... 10

– Scutellum dark orange to red........................................................................... 12

10. Propodeum laterally with two dark orange dots............................ Nomada fulvicornis jeizoensis Matsumura

– Propodeum entirely black without any dots................................................................ 11

11. Scutellum flat, nearly rectangular with shallow furrow.................................. Nomada kaguya Hirashima

– Scutellum highly raised with deep median furrow..................................... Nomada lathburiana (Kirby)

12. Propodeal triangle with two yellow zigzag patterns......................................... Nomada icazti Tsuneki

– Propodeal triangle without two yellow zigzag patterns....................................................... 13

13. HTS distinctly black.................................................................................. 14

– HTS light brown to dark brown......................................................................... 18

14. HTS stout, round at tip............................................................ Nomada guttulata Schenck

– HTS subacute to acute at tip............................................................................ 15

15. Paraocular area dark orange, sometimes tinged with bright yellow............................................. 16

– Paraocular area mostly black, lateral margin weekly tinged with dark red........................................ 17

16. Labral tooth on apical one-third, laterally with serrate carina............................ Nomada calloptera Cockerell

– Labral tooth at apex............................................................. Nomada maculifrons Smith

17. Propodeal triangle red with median black line..................................... Nomada leucophthalma (Kirby)

– Propodeal triangle black............................................................. Nomada fusca Schwarz

18. Mandible bidentate................................................................................... 19

– Mandible simple or truncate............................................................................ 20

19. Scutellum covered with golden plumose.................................................. Nomada opaca Alfken

– Scutellum covered with white hair........................................... Nomada biaulacis Lim & Lee , sp.n.

20. T5 entirely red...................................................................................... 21

– T5 with bright yellow band............................................................................ 23

21. HTS dark brown, round at tip..................................................... Nomada flavoguttata (Kirby)

– HTS light brown, sharp at tip........................................................................... 22

22. Paraocular area and supraclypeal area dark orange. Propodeal triangle red with median black line.................................................................................................. Nomada hakonensis Cockerell

– Paraocular area and supraclypeal area black, lateral margin of paraocular area weekly tinged with dark red. Propodeal triangle entirely black.................................................................. Nomada montverna Tsuneki

23. HTS stout, truncate at tip, distributed without space.................................... Nomada pyrifera Cockerell

– HTS subacute, distributed with space.................................................................... 24

24. T4 entirely dark brown................................................. Nomada adustaspinae Lim & Lee , sp.n.

– T4 tinged with yellow................................................................................. 25

25. Scutellum foveolate, the biggest interspace as wide as puncture.............................. Nomada abtana Tsuneki

– Densely foveolate without wide interspace................................................................ 26

26. Mandible truncate................................................................. Nomada striata Fabricius

– Mandible simple..................................................................................... 27

27. Antennae entirely dark orange................................................. Nomada panzeri orientis Tsuneki

– Antennae posteriorly tinged with black................................................................... 28

28. Propodeal triangle black; HTS irregularly distributed............................ Nomada amurensis Radoszkowsky

– Propodeal triangle black laterally tinged with dark red; HTS evenly distributed.................. Nomada fervens Smith

Males

1. Clypeus entirely black......................................................... Nomada harimensis Cockerell

– Clypeus tinged with yellow............................................................................. 2

2. HTS absent.......................................................................................... 3

– HTS present......................................................................................... 4

3. Scape ventrally and paraocular area entirely yellow, distinct two yellow oval maculation on scutellum............................................................................................... Nomada tsunekiana Schwarz

– Scape ventrally tinged with dark orange and black; paraocular area mostly black, margin of its yellow, scutellum entirely black............................................................................. Nomada esana Tsuneki

4. Gonostylus distinctly long and slender, acute apically................................... Nomada maculifrons Smith

– Gonostylus blunt and thick.............................................................................. 5

5. Supraclypeal area fully bright yellow................................................ Nomada pyrifera Cockerell

– Supraclypeal area fully black or tinged with quadrate yellow maculation......................................... 6

6. Mandible truncate..................................................................................... 7

– Mandible simple or dentate............................................................................. 9

7. Clypeus with yellow triangular maculation, somewhat laterally tinged with black............... Nomada pacifica Tsuneki

– Clypeus mostly black; apical margin with yellow band........................................................ 8

8. T2 basally tinged with dark brown, adults active in summer................................. Nomada abtana Tsuneki

– T2 dark orange, adults active in spring................................................ Nomada striata Fabricius

9. Pygidial plate triangularly notched....................................................................... 10

– Pygidial plate not triangularly notched.................................................................... 11

10. T1 entirely dark brown..................................................... Nomada amurensis Radoszkowsky

– T1 entirely pale brown, laterally with two dark brown oval maculation.................... Nomada calloptera Cockerell

11. Pygidial plate shallowly and roundly notched.............................................................. 12

– Pygidial plate distinctly notched........................................................................ 15

12. T2–T6 with distinct wide yellow band.............................................. Nomada lathburiana (Kirby)

– Partly with yellow band or widely darkened, but at least T2–T3 without yellow band............................... 13

13. HTS slender, difficult to differentiate among surrounding hair........................... Nomada montverna Tsuneki

– HTS thickness variable, evidently distinguished from surrounding hair.......................................... 14

14. Basoventral lobe distinctly present................................................... Nomada guttulata Schenck

– Basoventral lobe absent......................................................... Nomada flavoguttata (Kirby)

15. Scutellum entirely yellow......................................................... Nomada kaguya Hirashima

– Scutellum with yellow or red two oval maculation, sometimes entirely black..................................... 16

16. T2 laterally with distinct yellow maculation, T3 laterally with small yellow spots, remaining entirely dark brown........ 17

– Yellow maculation present on T3–5...................................................................... 18

17. F2 distinctly longer than F3..................................................... Nomada hakonensis Cockerell

– F2 as long as F3................................................................. Nomada aswensis Tsuneki

18. Mandible bidentate................................................................... Nomada opaca Alfken

– Mandible simple..................................................................................... 19

19. HTS thick, cylindrical............................................... Nomada fulvicornis jeizoensis Matsumura

– HTS thin, hair-like................................................................................... 20

20. Abdomen entirely black with inverted triangle maculation........................... Nomada leucophthalma (Kirby)

– Abdomen without inverted triangle maculation............................................................. 21

21. T2 dark brown with semicircle maculation on middle… Nomada shirakii Yasumatsu & Hirashima

– T2 laterally with yellow maculation...................................................................... 22

22. Abdomen tinged with pale brown....................................................................... 23

– Abdomen tinged with only dark brown and yellow.......................................................... 24

23. Gonostylus sharp, crescent-like........................................................ Nomada fervens Smith

– Gonostylus thick, triangular........................................................... Nomada icazti Tsuneki

24. Clypeus with yellow triangular maculation, somewhat tinged with black laterally......... Nomada panzeri orientis Tsuneki

– Clypeus mostly black, apical margin with yellow band....................................................... 25

25. F1 about half as long as F2, scutellum with two red oval maculation.......................... Nomada fusca Schwarz

– F1 one third of F2, scutellum entirely black................................ Nomada adustaspinae Lim & Lee , sp. n.