Key to species of the genus Caenomastax

1. Pronotum with pronounced hind margin (Figs. 53, 56, 78, 80), stout females (Figs. 77-84) and micropterous males........ 2

- Pronotum with truncated hind margin, slender females both sexes brachypterous (Figs. 59, 62, 82, 84).................. 3

2. Females: posterior projection of pronotal disc getting to half the tegmina length and with rounded tip (Fig. 80). Tegmina 3- lobed (Fig. 85). Medial projection of subgenital plate prominent and longer than lateral projections (Fig. 87). Males: abdominal sternites black and tomentose, lophi of epiphallus curving slightly towards the latero-external margin (Fig. 67)..................................................................................................... C. insignis

- Females: Hind projection of pronotal disc going slightly over half the tegmina length, obtuse tip (Fig. 80). Tegmina 2-lobed (Fig. 88). Medial projection of subgenital plate located in a deep emargination and as long and lateral projections (Fig. 90). Males: abdominal sternites yellowish and glabrous, lophi of epiphalls curving outwards (Fig. 68, 70)........ C. similis n. sp.

3. Tegmina metallic green in color, thorax and abdomen coloration brown. Pronotal disc in the females with a spot to each side of the prozona (Fig. 82). Lateral lobes of epiphallic plate emarginated, slender and curved, anterior margin of epiphallic plate emarginated with medial region of similar width than the epiphallic disc; lateral lobe of epiphallus with anterior margin elongate and the posterior margin slightly projected (Fig. 71)...................................... C. bimaculata n. sp.

- Tegmina coloration blue, general coloration of thorax and abdomen yellow and blue (Fig. 62, 83, 84). Lateral lobes of epiphallic plate shoulder blade-shaped; anterior margin of epiphallic plate slightly emarginated. Length of medial region of epiphallic disc wavy, lateral lobe of epiphallus with anterior and posterior margin similar-sized (Fig. 74, 76)........................................................................................................ C. magdalenensis n. sp.