Contributions to the karyology of Euconcocephalus incertus and Allodapia aliena (Tettigoniidae, Orthoptera.

The chromosome complement of two species of Indian Tettigoniids, namely, Euconcocephalus incertus (2n male = 20A + XX) and Allodapia aliena (2n female = 28A + XX) have been reported for the first time. The former species has two pairs of metacentric and two pairs of submetacentric autosomes, and a pair of metacentric sex chromosomes, whereas in the latter species all the chromosomes are telocentric and the sex chromosomes are very long. The probable occurrence of centric fusions, translocations and inversions during the karyotypic evolution of these grasshoppers is discussed.