Key to males of Barryfilius

1 Antennomere 7 lamellate, or sublamellate at least 0.75x length of lamella of antennomere 8; antennomere 6 lamellate or sublamellate......................................................................................... 2

- Antennomeres 6 and 7 discoidal, sometimes with a slight indication of a lamella................................... 3

2 Antennomere 7 sublamellate, about 0.75x length of lamella of antennomere 8; antennomere 6 sublamellate, about 0.45x length of lamella of antennomere 8; antennomere 5 discoidal; aedeagus as in Fig. 20............... B. contiguus (Britton, 1978)

- Antennomeres 6 and 7 lamellate, as long as lamella of antennomere 8; antennomere 5 sublamellate, about 0.5x long as lamella of antennomere 6; aedeagus as in Fig. 23............................................ B. quinarius (Britton, 1978)

3 Middle third of posterior edge of pronotum without a narrow, raised margin; pale red-brown; clypeus less transverse, 2.8x wide as long; aedeagus as in Fig. 19..................................................... B. centralis (Britton, 1978)

- Middle third of posterior edge of pronotum with a narrow, raised margin defined by a groove; colour very dark red-brown or pale red-brown; clypeus more transverse, more than 3.5x wide as long........................................... 4

4 Body light red-brown; clypeus indented in the middle with the labrum visible from above; punctuation of the clypeus and frons finer and denser (about 50 mm- 2 in middle of clypeus); groove defining the narrow, raised posterior margin present across the middle of the pronotum; aedeagus as in Fig. 21........................................... B. laevis (Arrow, 1932)

- Body dark red-brown; clypeus with a shallow indentation in the middle, labrum not visible from above; punctuation of the clypeus and frons coarser and less dense (about 30 mm- 2 in middle of clypeus); groove defining the raised posterior margin of the pronotum obliterated in the middle.................................................................... 5

5 Setae on the abdominal ventrites less elongate, about 1.5x long as wide; clypeus less transverse, about 2.7x wide as long; aedeagus as in Fig. 22............................................................. B. lewisae (Britton, 1978)

- Setae on abdominal ventrites elongate, about 2.5–3x long as wide; clypeus more transverse, 3.1–3.2x wide as long; aedeagus as in Fig. 24...................................................................... B. vernus (Britton, 1978)