Key to the species of the C. isayae species group (Females)

1. Upper valve of ovipositor distinctly thickened apically (Fig. 1B)... C. crassicaudata Sääksjärvi, Bordera & Palacio sp. nov.

- Upper valve of ovipositor in lateral view uniformly wide along their length, or with the apex slightly slender (Figs 1A, 4F, 5F, 6F, 7F, 8F)........................................................................................... 2

2(1). Metapleuron and metasomal tergites entirely black (Figs 5D, E). Tergite I of metasoma 1.2–1.3 × as long as posteriorly broad (Fig. 9C). Epicnemial carina relatively strong, its dorsal end weakly curved backward, ending slightly above level of center of pronotum.................................................................. .. C. nigriventris Palacio sp. nov.

- Metapleuron and metasoma with variable colouration, never entirely black (Figs 1A, B, 3C, 4D, E, 6D, E, 7D, E, 8D, E). Tergite I of metasoma 1.4–1.6 × as long as posteriorly broad (Figs 9B, 9D–F). Epicnemial carina weak, its dorsal end straight, ending at or slightly below level of center of pronotum....................................................... 3

3(2). Ocular orbits entirely yellow or white (Figs. 1A, 8A, 11E). Mesosoma mostly yellow or white with black or brown coloured marks. Speculum yellow or whitish (Figs 1A, 8D)............................................................ 4

- Ocular orbits widely interrupted posteriorly (Figs 4A, 6A, 7A, 11D). Mesosoma extensively reddish-brown with black or yellow marks. Speculum always reddish (Figs 4D, 6D, 7D)...................................................... 5

4(3). Background colour of mesosoma white (Fig. 1A). Clypeus 1.8–1.9 × as broad as medially long; clypeal suture slightly curved, almost straight (Fig. 8B). Occipital carina present dorsally (Fig. 11E)........ C. taironae Palacio, Bordera & Díaz sp. nov.

- Background colour of mesosoma yellow (Fig. 8D). Clypeus 1.6 × as broad as medially long; clypeal suture strongly curved (Fig. 3A). Occipital carina absent dorsally............................... C. isayae Díaz, Bordera & Palacio sp. nov.

5(4). Occipital carina discernible ventrally (Fig. 11D). Subalar prominence densely punctate (at least 24 setiferous punctures) (Fig. 11A). Hind wing with abscissa of Cu 1 curved (Fig. 7H)....................... C. splendida Palacio & Bordera sp. nov.

- Occipital carina completely absent ventrally. Subalar prominence sparsely punctate (at most about 17–18 setiferous punctures) (Figs 11B, C). Hind wing with abscissa of Cu 1 straight (Figs 4H, 6H)........................................... 6

6(5). Mesopleuron and metapleuron entirely red. Mesoscutum with fine and sparse setiferous punctures (Fig. 4D). Clypeus about 1.64 × as broad as medially long. Malar space about as long as basal mandibular width (Figs 4A, B).................................................................................................. .. C. kalima Palacio sp. nov.

- Mesopleuron and metapleuron with extensive white areas. Mesoscutum with moderately long and sparse setiferous punctures (Fig. 6D). Clypeus about 1.80 × as broad as medially long. Malar space 0.76 × as long as basal mandibular width (Figs 6A, B)............................................................................... C. panchei Palacio sp. nov.