Key to species of Neometrypus Desutter, 1988

1. FWs absent, median projection of metanotum absent......................................................... 2

- FWs present, median projection of metanotum present........................................................ 3

2. Antenomeres banded, base of subapical spurs of TIII dark brown; apex of basitarsomere of TIII dark brown; apex of LLophi rounded............................................................... Neometrypus amazonus Desutter, 1988

- Antenomeres not banded, base of subapical spurs of TIII same colour as tibia; apex of basitarsomere of TIII with uniform coloration; apex of LLophi truncated................................................... Neometrypus couriae n. sp.

3. First abdominal sternite prominent (Fig. 19J, K)............................................................. 4

- First abdominal sternite not prominent..................................................................... 6

4. Abdominal tergites with similar coloration......................................... Neometrypus mendoncae n. sp.

- Abdominal tergites medium to dark brown on the last three or five tergites (Fig. 13A, G)............................ 5

5. Abdominal tergites with median longitudinal bands (Fig. 13A, G); FWs not reaching posterior margin of metanotum; LLophi shorter than PsP; PsP without inner projection on inner face in ventral view................... Neometrypus maiae n. sp.

- Abdominal tergites without bands; FWs reaching posterior margin of metanotum; LLophi same size or longer than PsP; PsP bearing an inner projection on inner face in ventral view................. Neometrypus badius Mesa & García-Novo 2001

6. Abdominal tergites without delimited longitudinal band, dark brown, uniform (Fig. 11A, G)..... Neometrypus lopesae n. sp.

- Abdominal tergites crossed by a median, well delimited, longitudinal band, generally dark brown (Figs 3A; 5A; 7A, G; 15A, G; 17A, G; 21A, G)................................................................................... 7

7. Last abdominal tergite with similar coloration of others tergites (Figs 3A, 21A).................................... 8

- Last abdominal tergite dark brown, different from other tergites (Figs 5A, 7A, 15A, 17A)............................ 9

8. Pronotum DD brownish orange, median projection of metanotum reddish (Fig. 3D); median band of abdominal tergites welldelimited, dark brown (Fig. 3A); abdominal sternites totally or partially dark brown (Fig. 3F)... Neometrypus azevedoi n. sp.

- Pronotum dorsal disk yellowish-brown, median projection of metanotum yellowish (Fig. 21A, G); median band of abdominal tergites not well-delimited (Fig. 21A, G); abdominal sternites whitish (Fig. 21F).............. Neometrypus monnei n. sp.

9. Pronotum and abdominal tergites dark brown laterally, not spotted............................................. 10

- Pronotum and abdominal tergites not dark brown laterally, spotted (Figs 7A, 15A, 17A)............................ 11

10. Pronotum medium brown to yellowish-brown; FWs inner margins overlapped..... Neometrypus aculeatus (Saussure, 1878)

- Pronotum entirely dark brown except median longitudinal band brownish orange (Fig. 5A), FWs inner margins not touching each other.................................................................... Neometrypus carvalhoi n. sp.

11. Supra anal plate dark brown (Fig. 15E); sternites with thin and short horizontal stripes dark brown on latero-posterior margins (Fig. 15F)..................................................................... Neometrypus marcelae n. sp.

- Supra anal plate anterior margin dark brown, posterior margin light brown or yellowish-brown (Figs 7E, 17E); sternites without horizontal stripes on latero-posterior margins............................................................... 12

12. Median projection of metanotum same color as pronotum and abdominal tergites, anterior margin almost straight (Fig. 17D); median band abdominal tergites fading distally; posterior margin of supra anal plate rounded (Fig. 17E); LLophi posterior margin rounded; PsP longer than LLophi (Fig. 18A, B); copulatory papilla flattened dorso-ventrally, not fended ventrally (Fig. 18F)........................................................................ Neometrypus mejdalanii n. sp.

- Median projection of metanotum darker than pronotum and abdominal tergites, its anterior margin rounded (Fig. 7D); median band abdominal tergites well delimited through entire abdomen (Fig. 7A, G); posterior margin of supra anal plate straight (Fig. 7E); LLophi posterior margin truncated; PsP same size or shorter than LLophi (Fig. 8A, B); copulatory papilla cylindrical, fended ventrally (Fig. 8 E-G)....................................................... .. Neometrypus catiae n. sp.