Gula region of C. decorus showing extent of dark coloration.

Mouthparts of C. decorus.
a. Pecten epipharyngis with teeth of type B; b. Premandible with wide inner tooth; c. Antenna with relatively short basal segment; d. Mentum with broad centre tooth (type III),
4th laterals reduced about to level of 5th laterals (type II); e. Ventromentum; f. Mandible with the 3rd inner tooth incompletely separated and partly colored (type II)

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