Male germ cell chromosomes of two Calopterygoidea from the Darjeeling Himalaya (Zygoptera: Chlorocyphidae, Euphaeidae)

Spermatogonial and spermatocyte chromosomes of Rhinocypha quadrimaculata Selys ( Chlorocyphidae) and Bayadera indica (Selys) (Euphaeidae) are described and illustrated. Material originates from different localities in Darjeeling, India. In both species the chromosome number is 2n d = 25, n c? – 13, including a pair (bivalent) ot m-chromosomes. R. quadrimaculata is the first member of the family so far studied cytologically. The karyotypes of Epallage fatime (Charp.) and B. indica are briefly compared The former is the only other representative of Euphaeidae hitherto examined and deviates from the latter by the lack of m-chromosomes.