Mouthparts and anal tubule of C. melanescens.
a. Pecten epipharyngis - note sharp even teeth; b. Premandible; c. Mentum - note 4th laterals not reduced (type I), c1 tooth tall and narrow, and c2 teeth separate from c1 (type III);
d. Ventromentum with about 43 striae, X/Y = VMR; e. Antenna; f. Mandible - note 3rd inner tooth is pale and not fully separated (type IIB); g. the long narrow anal tubule.

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