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SUMMARY
The grasshopper Catantops humilis is prevalent in young oil palm and rubber plantations on the coastal plains of Peninsular Malaysia. The majority of male individuals have an XO sex determination mechanism, but a few populations show XO and neo-XY individuals occurring sympatrically. The centric rearrangement involves the X chromosome and an L2 autosome. During meiosis the neo-Y retains its euchromatic nature throughout first prophase, and its segregation from the neo-X is regular. In addition to the variation in mean cell chiasma frequency between populations produced by differences in population size, the fusion causes significant reduction in this parameter through distal localisation of a single chiasma in the neo-XY bivalent.