Key to the species of coastal Bledius from Brazil (adapted from Caron & Ribeiro-Costa 2007)

1. Head with supraantennal ridge extended anteriorly into a broad horn (male longer than female); pronotum with an abrupt con- striction near the base.................................. ( bonariensis group) B. bonariensis Bernhauer, 1912 (Fig. 1)

- Head with supraantennal ridge not extended anteriorly; pronotum without abrupt constriction near the base............. 2

2. Procoxal fissure closed, protrochantin concealed..................................... ( punctatissimus group, part) 3

- Procoxal fissure open, protrochantin exposed................................................................ 4

3. Elytra with a sclerotized median tip on posterior margin (Fig. 7, arrow); tergite VIII with posterior margin truncate...................................................................................... B. borzonei, sp. nov. (Fig. 3)

- Elytra without sclerotized median tip on posterior margin; tergite VIII with posterior margin emarginated...................................................................................... B. fernandezi Bernhauer, 1939 (Fig. 2)

4. Gular sutures fused anteriorly; tergite VIII with posterior margin emarginate (Fig. 17)......................................................................................... ( emarginatus group) B. externus Lynch, 1884 (Fig. 4)

- Gular sutures not fused anteriorly; tergite VIII with posterior margin truncate (Figs. 23, 24).. ( punctatissimus group, part) 5

5. Elytra pale yellow with basal and usually subapical median brownish spots; body size 1.76–1.84 mm ................................................................................ B. hermani Caron & Ribeiro-Costa, 2007 (Fig. 5)

- Elytra entirely dark brown to black; body size 1.7–2.55 mm ........................... B. depressus, sp. nov. (Fig. 6)