Provisional key to species of Nyctonympha

1. Dorsal and lateral longitudinal carinae on elytra distinct. Venezuela ………………………………… ……………………………………………………..……………… N. costipennis (Lameere, 1893)

– Dorsal and lateral carinae on elytra feebly marked or absent …………..…………………..2

2. Body slender (Figs 6, 16, 20–22, 25, 26, 28) …………………………………….………………….3

– Body wider (Figs 1, 18, 24, 27) …………………………………………………………………12

3. Femora entirely dark ……………………...………………………………………………………4

– Femora entirely or partially light ………………………………………………………………7

4. Distance between upper eye lobes distinctly wider than width of one lobe …………………5

– Distance between upper eye lobes about equal to width of one lobe …………………………6

5. Punctures on scape and femora distinctly contrasting with pubescence; mesepisternum punctate (Fig. 21). Colombia ……………………………………… N. boyacana Galileo & Martins, 2008

– Punctures on scape and femora not distinctly contrasting with pubescence; mesepisternum smooth (Figs 5–8). Colombia ……………………………………………………… N. antonkozlovi sp. nov.

6. Apex of sutural angle of the elytra projected. Colombia … N. howdenarum Martins & Galileo, 1992

– Apex of sutural angle of the elytra rounded (Fig. 16). Panama, Venezuela ………………… ……………………………………………………………………… N. annulata Aurivillius, 1900

7. Elytra coarsely punctate (punctures on basal half closer than diameter of one puncture) (Fig. 20). Ecuador, Bolivia ……………………………………………………… N. flavipes Aurivillius, 1920

– Elytra moderately finely punctate (punctures on basal half farther apart than the diameter of one puncture) ……………………………………………………………………………………………8

8. Mesepisternum punctate ……………………………………………………………………………9

– Mesepisternum impunctate ………………………………………………………………………10

9. Scape reddish-brown (Fig. 28). Ecuador …………………… N. genieri Martins & Galileo, 1992

– Scape dark-brown (Figs 22–23). Brazil (Rio de Janeiro), Bolivia (?) …………………………… ………………………………………………………………… N. carioca Galileo & Martins, 2001

10. Tibiae with dark ring at middle. Peru, Bolivia ……………………… N. annulipes (Belon, 1897)

– Tibiae not centrally ringed ………………………………………………………………………11

11. Abdominal ventrites smooth (Fig. 25). French Guiana …… N. affinis Martins & Galileo, 2008

– Abdominal ventrites punctate (Fig. 26). Argentina (Salta), Bolivia ……………………………… ………………………………………………………………… N. punctata Martins & Galileo, 1989

12. Abdominal ventrites impunctate …………………………………………………………………13

– Abdominal ventrites punctate ……………………………………………………………………14

13. Mesepisternum punctate (Figs 17–19). Venezuela ……………… N. carcharias (Lameere, 1893)

– Mesepisternum impunctate (Fig. 27). Trinidad and Tobago …… N. taeniata Martins & Galileo, 1992

14. Femora with punctures distinctly contrasting with pubescence (Fig. 24). Colombia …………… ………………………………………………………………………… N. cribrata (Thomson, 1868)

– Femora without punctures contrasting with pubescence …………………………………………15

15. Body moderately wide; lateral tubercles of prothorax acute at apex; elytral apex strongly, obliquely truncate with outer angle forming long spine. Colombia, Bolivia …………………… ……………………………………………………………… N. andersoni Martins & Galileo, 1992

– Body notably wide; lateral tubercles of prothorax blunt at apex; elytral apex obliquely truncate with outer angle not forming long spine (Figs 1–4). Colombia ……………… N. sinjaevi sp. nov.