Frontoclypeus and gular region of C. 'butleri'.  Photos courtesy of I. Proulx

Larval mouthparts of C. 'butleri'
a. Mentum - Note 4th laterals slightly reduced (type I-II); high c1 and distinct c2 teeth (type III or II) b. Antenna;
c. Ventromentum; d. Pecten epipharyngis; e. Mandible - note 3rd inner tooth only partially separated and pale (type II).

Polytene chromosomes of C. 'butleri'
N - nucleolus; BR - Balbiani ring

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