Key to species of the genus Coarazuphium (modify from Ball & Shpeley 2013)

1. Anophthalmous. Maximum width of elytra near middle. Male genitalia: right paramere styliform, about as long as left paramere......................................................... C. cessaima Gnaspini, Vanin & Godoy, 1998

- Microphthalmous. Maximum width of elytra near middle, or posteriad middle. Male genitalia: right paramere styliform or not, distinctly shorter than left paramere....................................................................... 2

2. Elytron with apical margin truncate, not sinuate. Male right paramere styliform or broad............................. 3

- Elytron with apical margin sinuate. Male right paramere broad, not styli- form, distinctly shorter than left paramere....... 5

3. Head dorsally without setae posteriad the anterior supraorbital setae............ C. tapiaguassu Pellegrini & Ferreira, 2011

- Head dorsally with one to three pairs of setae posteriad the anterior supraorbital setae...............................4

4. Labrum with anterior margin broadly concave. Prosternal setae two pair. Maximum width (of elytra) posteriad transverse mid- line. Male right paramere broad, not styliform, distinctly shorter than left paramere. Brazil ...................................................................................................... C. pains Álvares & Ferreira, 2002

- Labrum with anterior margin irregularly convex. Prosternal setae one pair. Male right paramere styliform, more than half length of left paramere. Mexico .............................................. C. whiteheadi Ball & Shpeley, 2013

5. Head dorsally with a single pair of setae posteriad the anterior supraorbital setae. Male left paramere styliform....................................................................................... C. tessai (Godoy & Vanin, 1990)

- Head dorsally with two pairs of setae posteriad the anterior supraorbital setae...................................... 6

6. Head dorsally with two pairs of setae (posterior supraorbitals and occipitals,) at posterior border of head capsule. Male left paramere broad, conchoids............................................ C. bezerra Gnaspini, Vanin & Godoy, 1998

- Without the above combination of characters................................................................ 7

7. Slight apical sinuosity of elytron (Figs. 12 A–C)................................ C. formoso Pellegrini & Ferreira 2011

- Pronounced apical sinuosity of elytron (Figs. 12 B–D)........................................... C. caatinga sp. n.