Chromosome Karyotypes for 4 Species of Local Grasshopper (ORTHOPTERA:Oedipodidae) from Qinghai

The Karyotype and chromosome numbers of 4 species of the local grasshopper from Qinghai alpine meadow, which included Bryodemella holdereri holdereri Krauss), Bryodema Iuctuosum IuctuosumStoll) Oedaleus infernalisSauss), Oedaleus asiatiusc ( B. Bienko) were studied with method of conventional cytogenetics.The results indicated that in 4 species of the local grasshopper, the chromosome numbers were all 2n( ( ) = 23 = 22 + XO,23 chromosomes were all acrocentric ones. The karyotype formula o chrosome of 4 species of local grasshopper was all K(2n, ) = 23 = 23T = 4L + 14M + 4S + XO. The main differences among 3 genuses of Oedipodidae was obviously variety of relative length of autosomes and sex chromosomes. The main differences between 2 species of Oedaleus were the relative length of autosomes.