Polytene chromosome complement of C. 'februarius'
BR - Balbiani ring; N - nucleolus; P - puff.
Arm G is heterozygous for an inversion involving the region of the BR at the distal end.

Polytene chromosome complement of C. 'species NI 1'
Labelling as above.
The 'ball' and the adjacent constriction (bands 3e-2d, 8a-9) are where arm A is identified.

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