Key for males of Psychoda from Brazil

1 Frontoclypeal suture present; hair patch of frons not extending between the eyes, with a small triangular patch (sometimes divided) between the eyes; hair patch of vertex divided by a naked median band; surstylus short and truncate.............................................................................. P. dantilandensis Bravo, Cordeiro & Chagas

- Frontoclypeal suture absent; hair patch of frons extending between eyes; hair patch of vertex not divided; surstylus long and slender.............................................................................................. 2

2 Radial fork incomplete........................................................................ P. zetoscota

- Radial fork complete.................................................................................. 3

3 Wing without infuscation at apices of veins; antenna with 13 or 14 flagellomeres, but when 13, flagellomeres 11–13 fused, 12th flagellomere vestigial; ascoids in Y or Ψ, with well developed branches..................................... 4

- Wing with infuscation at apices of veins; antenna with 13 flagellomeres, 13th smaller and separated, 12th well developed, fused with 11th; ascoids always in Y, with short branches..................................................... 6

4 Antenna with 14 flagellomeres; distitarsus with apical projection; palpal formula approximately 1:1:1:1................ 5

- Antenna with 13 flagellomeres, 12th vestigial, sometimes represented only by the spine; distitarsus without apical projection; palpal formula: 1:1.1:1.3:1.6.................................................................. P. savaiiensis

5 Gonostylus with one long setae at base; basiphallus shorter than distiphallus; ascoids in Ψ................. P. amazonensis

- Gonostylus without long setae at base; basiphallus longer than distiphallus; ascoids in Y................... P. divaricata

6 Paramere robust, as long as and ending at the same level of distiphallus................................... P. alternata

- Paramere slender, strongly curved and shorter than distiphallus....................................... P. alternicula