Abstract

1. An analysis of salivary gland chromosome C in Sciara ocellaris and Sciara reynoldsi is presented. 2. A description of a spontaneous inversion occurring in chromosome C in one stock of S. ocellaris is given. 3. Intraspecific matings of the three stocks of S. ocellaris show the presence of one small difference, a deficiency of two bands near end 2 of chromosome C in the "Hammond" stock. 4. In the intraspecific matings of four stocks of S. reynoldsi, no small differences in chromosome C are detectable. 5. In interspecific matings between S. ocellaris and S. reynoldsi, chromosome C of reynoldsi differs from ocellaris by: (a) two independent inversions or one small transposition; (b) a short unpaired region; (c) small differences (deficiencies or duplications).

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