Key to species of Cuyabasa (adapted from Bechyné 1959)

1 Punctation of pronotum almost absent or at least finer than elytral punctation; surface of antennal calli mostly smooth..... 2

- Punctation of pronotum as apparent as elytral punctation; surface of antennal calli rugose; elytra metallic blue to green; pronotum, underside, head and legs dark red to reddish black; antennomeres 4–11 more dark; spermatheca as in Figure 2 ..................................................................... Cuyabasa gastrophysoides Bechyné, 1959

2 Ventral side, scutellum, head, legs and antennae black; elytra metallic blue to green; pronotum yellow to red; frontal ridge not reaching antennal sockets; spermatheca and aedeagus as in Figure 3 ................... Cuyabasa minor (Bechyné, 1955)

- Underside, head, legs and antennae red ordark red; antennomeres 4–11 darkened; frontal ridge reaching antennal sockets; aedeagus as in Figure 1 ................................................. Cuyabasa chiquitoensis Bechyné, 1959