The chromosomal analysis of Garrulus glandarius brandtii and Pica pica sericea of the family Corvidae (Passeriformes) in Korea was performed by conventional Giemsa staining and C-banding method. The diploid number of two species was 2n=78-80. The conventional karyotypes were very similar, but distribution of constitutive heterochromatin was different in 1st, 3rd and W-chromosome. Besides, interstitial constitutive heterochromatin bands were found in 4 pair of chromosomes in G. glandarius but 3 pair of chromosomes in Pica pica.