Key to Brazilian species of the genus Rachicerus Wlaker

1 Antenna bipectinate with 19 flagellomeres, disc of thorax orange, abdomen dark blue to black......... R. carrerai sp. nov.

1’ Antenna pectinate, with 20 or more flagellomeres, disc of thorax an abdomen entirely or partially blackish to brownish.... 2

2 Antenna with 20 to 27 flagellomeres...................................................................... 3

2’ Antenna with 30 flagellomeres........................................................................... 5 3 Antenna with 20 flagellomeres, 2 nd abdominal segment yellowish....................................... R. oliverioi

3’ Antenna with 24-27 flagellomeres, abdominal segments different from above...................................... 4

4 Antenna with 24 flagellomeres, 2 nd and 3 rd abdominal segments whitish..................................... R. lanei

4’ Antenna with 27 flagellomeres, abdominal segments bright black......................................... R. lopesi

5 Longitudinal veins strongly darkened, abdomen entirely black........................................... R. marcusi

5’ Longitudinal veins darkened only in costal region of the wings, 2 nd abdominal segment bright yellow........... R. shannoni