Abstract
Three samples of Sinipta dalmani polymorphic for the M4 pericentric inversion were assayed for chromosomal variation and allozymic variation at 18 loci (9 enzymatic systems). No sig-nificant differences in inversion frequencies between two samples of the same population were found (early and late spring). This was considered compatible with the absence of directional selection on adult viability for the M4 inversion. Gene flow between two populations was statistically significant when calculated either from chromosomal or from enzymatic data. A tendency to association between the Ldh-11 allele and the standard sequence was observed.
