Key to Neotropical species of Setacera

1. Presutural supra-alar seta weak, length about half that of presutural seta; overall body coloration more bluish gray; midtibia of males lacking apical tufts of long hairs; females with 6 visible abdominal segments from dorsal view..................................................................................................... S. pilicornis (Coquillett)

- Presutural supra-alar seta well developed, subequal to presutural seta; overall body coloration more brownish; midtibia of males with apical tufts of long hairs; females with 7 visible abdominal segments from dorsal view..................... 2

2. Midfemur of males with posteroventral row of numerous (>40) long setae near base subequal in length to greatest width of femur; sternites 3 and 4 of males lacking dense patch of well-developed setae posteromedially; anal plate of females prominent, length equal to width.............................................................. S. trichoscelis Mathis

- Midfemur of males lacking posteroventral row of setae as above; sternites 3 and 4 of males with dense patch of well-developed, conspicuous setae posteromedially; anal plate of females not as prominent, width greater than length...................................................................................................... S. durani Cresson