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RésuméNous comparons les caryotypes polytènes de 7 espèces du genre Bilobella. L'analyse des séquences de We compare the polytene karyotypes of 7 species of the genus Bilobella. The analysis of the band sequences displays large interspecific differences, in contrast with the relative similarity of the external phenotypes. It is more particularly impossible to homologize all chromosomes through the seven species, and it is necessary to bring out eleven distinct types of chromosomes the combination of which leads to an haploid karyotype n = 7 in every species.The morphometric study of the karyotypes gives some results, but so far, only the characters of external morphology have allowed satisfying phylogenetic reconstruction of the genus. Such a situation is completely different from the one which is known in Diptera with polytene chromosomes, and states the problem of the genetic significance of the chromosomal band sequences in the chromosomes of Neanurinae Collenibola.

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