Key for males from Northeastern Brazil

1. Mandible with one distinct ventralmost tooth, remaining teeth fused............................................ 2

- Mandible with all teeth distinct.......................................................................... 8

2. Median clypeal lobe trapezoidal (Fig. 6B).................................................................. 3

- Median clypeal lobe angulate (Fig. 6D)................................................................... 5

3. Frons and dorsal pronotal area coriaceous; apical harpal margin slightly incurved (Figs 11I, J); cuspis ventral arm setose (Figs 11A, B).................................................................. C. santacatarinae (Evans, 1964)

- Frons and dorsal pronotal area smooth; apical harpal margin with small, well-delimited excavation (Figs 11A, B); cuspis ventral arm glabrous........................................................................................ 4

4. Aedeagal inner lobe as wide and longer than outer lobe; outer lobe pointed................. C. quadratus (Evans, 1963)

- Aedeagal inner lobe twice narrower, twice shorter than outer lobe; outer lobe rounded or slightly concave........................................................................................... C. paraensis (Kieffer, 1910b)

5. Metapostnotal median carina complete (Fig. 8A); apical harpal margin strongly emarginated to half of harpe (Figs 11G, H)....................................................................................... C. piripiri sp. nov.

- Metapostnotal median carina incomplete posteriorly (Fig. 8F); apical harpal margin not strongly emarginate to half of harpe. ................................................................................................... 6

6. Emargination of apical harpal margin less than 0.15× harpe length (Fig. 11A, B)................... C. awaguaja sp. nov.

- Emargination of apical harpal margin more than 0.25× harpe length............................................. 7

7. Dorsal harpal margin outcurved; outer lobe apex rounded and posterior to inner lobe apex.......................................................................................... C. quelatus (Ramos, Araújo & Azevedo, 2010)

- Dorsal harpal margin straight; outer lobe apex acute and anterior to inner lobe apex................ C. tremembe sp. nov.

8. Median clypeal lobe angulate (Fig. 6B).................................................................... 9

- Median clypeal lobe trapezoidal (Fig. 6D)................................................................. 13

9. Mandible teeth with less than five distinct apical teeth; frons and dorsal pronotal area coriaceous; apical harpal margin outcurved.................................................................... C. neotropicus (Evans, 1963)

- Mandible teeth with five distinct apical teeth; frons and dorsal pronotal area smooth; apical harpal margin slightly incurved or strongly emarginate.................................................................................. 10

10. Harpe with medial-dorsal corner partially arched, apical margin strongly emarginate; cuspis with dorsal arm laminar; cuspis with ventral arm glabrous (see Fig. 18 in Azevedo & Batista 2002)............ C. megaventris (Azevedo & Batista, 2002)

- Harpe whole arched, bilaminar, apical margin slightly incurved; cuspis with dorsal arm bilaminar; cuspis with ventral arm setose (Figs 11E, F).................................................................................. 11

11. Anterior ocellus anterior to supra-ocular line (Fig. 5A); posterior hypopygeal margin straight (Fig. 10E)..................................................................................... C. ocullatus (Azevedo & Batista, 2002)

- Anterior ocellus posterior to supra-ocular line (Fig. 5B); posterior hypopygeal margin incurved (Fig. 10F).............. 12

12. Aedeagal apical lobe acute apically, dorsal surface slightly convex; aedeagus with two pairs of apical lobes (see figs 5–7 in Leal & Azevedo 2001)........................................................ C. clypeatus (Leal & Azevedo, 2001)

- Aedeagal apical lobe narrowing apicad, dorsal surface strongly convex; aedeagus with one pair of apical lobe (Figs 11E, F)...................................................................................... C. kanela sp. nov.

13. Frons and dorsal pronotal area coriaceous; digitus glabrous; dorsal harpal margin straight.......................... 14

- Frons and dorsal pronotal area smooth; digitus densely setose; dorsal harpal margin outcurved....................... 15

14. Cuspis with ventral arm rounded (Fig. 11F and see fig. 77 in Evans 1963)....................... C. inca (Evans, 1963)

- Cuspis with ventral arm straight (Fig. 11J)................................................ C. tenetehara sp. nov.

15. Metapectal-propodeal disc with transverse posterior carina, metapostnotal median carina complete; aedeagus with two pairs of apical lobes..................................................................... C. spinipes (Evans, 1969)

- Metapectal-propodeal disc without transverse posterior carina, metapostnotal median carina incomplete; aedeagus with one pair of apical lobes................................................................... C. guajajara sp. nov.