Key to species in species group 3

1. Pronotum with two linear depressions composed of united foveolae (note: C. longum Darby, 2019 shows traces on one side of the pronotum of a short depression but is not treated in this section of the key, see below)............................................................................................................................. 2

– Pronotum without linear depressions................................................................................................. 6

2. Posterior corners of mid-keel rounded (Fig. 48C).............................................. C. dewhurst sp. nov.

– Posterior corners of mid-keel with projecting angles ........................................................................ 3

3. Lateral margins of pronotum rounded ............................................................................................... 4

– Lateral margins of pronotum angulate............................................................................................... 5

4. Larger more rounded species...................................................................... C. globulum Darby, 2019

– Smaller, narrower species .................................................................................... C. murphyi sp. nov.

5. Mesoventral mid-keel elongate (Fig. 56C) ........................................................ C. mindanao sp. nov.

– Mesoventral mid-keel square (Fig. 55C) .................................................. C. marshallae Darby, 2019

6. Pronotal disc with only a trace of foveolae .................................................. C. amazonicum sp. nov.

– Pronotal foveolae covering the disc................................................................................................... 7 7. Lateral margins of pronotum angular ................................................................................................ 8

– Lateral margins of pronotum rounded ............................................................................................. 10

8. Mesoventral lateral margins rectangular, hind angles acute.......................... C. longum Darby, 2019

– Mesoventral lateral margins not rectangular .................................................................................... 9

9. Mid-keel very narrow at junction with collar......................................... C. amboroense Darby, 2015

– Mid-keel wide at junction with collar.............................................................. C. puncticolle sp. nov.

10. Elytra almost parallel-sided in posterior half....................................................................................11

– Elytra sinuate in posterior half ........................................................................................................ 12

11. Pronotum densely and finely foveolate (Fig. 54B) ................................................ C. mahleri sp. nov.

– Pronotum sparsely and more coarsely foveolate ................................................... C. werneri sp. nov.

12. Mid-keel not joining collar anteriorly.............................................................................................. 13

– Mid-keel joining collar .................................................................................................................... 14

13. Smaller species length 0.6–0.7 mm, elytra shorter in proportion to pronotum .. C. itoi Sawada, 2008

– Larger species length 0.8 mm, elytra longer in proportion to pronotum ........ C. latum Sawada, 2008

14. Mid-keel almost parallel-sided, hind angles rounded....................................... C. pilosellum sp. nov.

– Mid-keel not parallel-sided.............................................................................................................. 15

15. Mid keel tapering from wide base by collar to keel.................................. C. nomurai Sawada, 2008

– Mid keel otherwise ............................................................................................................................. 16

16. Mid keel with projecting hind angles ........................................................ C. pauxillum Darby, 2019

– Mid keel reduced to small fragments either side of medial extension of the collar ........................................................................................................... C. ikeuchii Sawada, 2008