Chromosome of Two Species of Short-winged Grasshoppers Form Cangshan Mountain Region

The chromosome karyotypes of two different grasshopper species,Anaptygus rufitibialus and Pseudoptygonotus prominemaginis were reported in this paper.It was showed that Pseudoptygonotus prominemaginis karyotypes with 2n(♂)=23,they are all telocentric chromosomes.The sex-chromosome belongs to large chromosomes,which took the first place in all chromosomes according to its relative length.Anaptygus rufitibialus karyotypes with 2n(♂)=17,they are middle chromosomes and telocentric chromosomes,the sex-chromosome belongs to large chromosomes,its relative length was at the fourth place in all chromosomes.The cross frequencies of chromosomes of these two short-winged grasshopper species mainly appeared on locus 1 and locus 2 during the meiosome process.