Gracilaclopus

Key to species of Gracilaclopus

1. Labrum with two teeth at apex, teeth strongly developed and reflexed (Fig. 5)................. G. bidentulus new species

1’. Labrum complete lacking teeth, with apex straight or indented in middle, if indented, indentation variable in depth (Figs. 8–10, 15, 17, 19, 21)........................................................................................ 2

2. Labrum with apex indented.............................................................................. 3

2’. Labrum with apex complete (could be slightly sinuous in middle)................................................4

3. Scutellum dark-brown or black; parameres as Fig. 29 .................................. G. nigroscutatus new species

3’. Scutellum light brown (same color as elytra) parameres different from above...................................... 5

4. Pronotum brown, with 1–3 setae on each side of disc on middle, parameres as Fig. 27 a........... G. electricus new species.

4’. Pronotum light brown, with a row of 5–6 long setae on each side of disc on middle, male genitalia as Fig. 24 ................................................................................................ G. caceresi new species

5. Labrum broadly rounded, with apical margin thickened (Fig. 12).......................... G. crepuscularis new species

5’. Labrum subrectangular (on dorsal view), apical margin not thickened............................................. 6

6. Body with color uniform, dark brown or black; parameres as Fig. 28 ......................... G. morochus. new species

6’. Body bicolor, head and pronotum dark brown, elytra light brown; parameres different from above...................... 7

7. Males with parameres as Fig. 25; body size> 5.0 mm.................................... G. candelariae new species

7’. Males with parameres as Fig. 30; Body size <5.0 mm.......................................... G. parvulus (Ohaus)