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Сhromosomal complements of Pelophylax ridibundus Pallas, 1771 from 9 localities (Northern, Central and South Armenia) and Rana macrocnemis Boulenger, 1885 from one locality (North-West Armenia) have been analyzed. The chromosome sets of P. ridibundus collected  from 8 localities showed 2n=26, (10m+12sm+4st; NF=52). A secondary  constriction has been observed in all studied individuals on the 10-th  chromosome pair showing NOR-positive reaction. C-positive  heterochromatin blocks have been observed on long arms of the 2-nd and  10-th pairs of chromosomes (7 localities). In addition,  C-heterochromatin blocks have been found on interstitial regions of  short arms of the 12-th pairs, as well as in telomeric regions of long  arms of the 9-th pairs and on short arms of the 5-th pair in the frogs  from 2 localities. The karyotype of P. ridibundus from populations near Ejmiatsin differs from other populations (2n=26, 12m+10sm+4st). Diploid number of chromosomes of R. macrocnemis  was also 26 (8m+12sm+6st, NF=52). Blocks of C-positive heterochromatin  have been revealed in telomeric parts of the 1-st, 2-nd (p), 3-rd (q),  4-th (q), 6-th, 9-th (p), 10-th (p,q) and 13-th (q) pairs, as well as in  interstitial regions of the 1-st and 2-nd pairs of  chromosomes.  Intrapopulation and interpopulation geographic variations  of karyotypes and C-heterochromatin banding patterns of P. ridibundus have been revealed. Karyotypically, morphotypes “macrocnemis” and “camerani” are closely related

Features of the karyotypes of Pelophylax ridibundus Pallas, 1771 and Rana macrocnemis Boulenger, 1885 (Amphibia: Ranidae) from Armenia