Key to males of the Neotropical species of the genus Atrichobrunettia

1. Parameres uniformly wide, rectangular with truncate or rounded apex, wider than gonocoxites (Fig. 43) .................................................................................................... 2

­ Parameres triangular with pointed apex, or, with internal lobe digitiform at apex, or, if retangular, parameres narrower than gonocoxites......................................................... 3

2. Parameres with truncated apex; aedeagal apodeme long, 1.5X length of gonocoxite ... ................................................................................................ A. pennata Bravo, sp.nov.

­ Parameres with rounded apex; aedeagal apodeme same length as gonocoxite .............. ................................................................................................................ A. bora (Bravo)

3. Parameres triangular (Figs. 23, 26, 30, 33, 39) ............................................................ 4

­ Parameres rectangular with truncate apex or with internal lobe digitiform at apex .... 8

4. Antenna with 13 flagellomeres; eye bridge with 4 facet rows; parameres parallel (Fig. 39) ................................................................................. A. minuta Bravo, sp. nov.

­ Antenna with 14 flagellomeres; eye bridge with 3 facet rows; parameres divergent .. 5

5. Parameres longer than gonocoxite .............................................................................. 6

­ Parameres ½ length of gonocoxite ............................................................................... 7

6. Parameres with parallel arms; posterior margin of post­hypandrial plate with inverted U­shape invagination; aedeagus ending before posterior margin of post­hypandrial plate (Fig. 23) ........................................................................ A. angelae Bravo, sp. nov.

­ Parameres with divergent arms; posterior margin of post­hypandrial plate straight; aedeagus ending after posterior margin of post­hypandrial plate (Fig. 26) ................... ........................................................................................... A. longipenis Bravo, sp. nov.

7. Radial fork situated proximal to medial fork (Fig. 28); aedeagal apodeme ending before gonocoxal bridge (Fig. 30) .................................... A. brevicornis Bravo, sp. nov.

­ Radial fork situated distal to medial fork; aedeagal apodeme ending after gonocoxal bridge (Fig. 33) .................................................................... A. bispinata Bravo, sp. nov.

8. Radial fork situated basal to medial fork; parameres with truncate apex; distiphallus with shafts separated and curving inward, meeting on midline .......... A. bistria (Quate)

­ Radial fork situated apical to medial fork; parameres with internal lobe digitiform at apex; distiphallus with parallel shafts .......................................................................... 9

9. Aedeagal apodeme ending before anterior margin of gonocoxal bridge .................... 10

­ Aedeagal apodeme ending after anterior margin of gonocoxal bridge ...................... 11

10. Radial fork situated apical to medial fork (Fig. 18) ............... A. spinata Bravo, sp. nov.

­ Radial fork situated proximal to medial fork (Fig. 15) .. A. paranaensis Bravo, sp. nov.

11. Aedeagal apodeme narrow (Fig. 13) ............................. A. amazonensis Bravo, sp. nov.

­ Aedeagal apodeme wide at base, narrow at apex (Fig. 17) ...... A. ampla Bravo, sp. nov.