The species composition and inversion polymorphism were studied in malaria mosquito larva hemipopulations of Karelia. Three malaria mosquito species–Anopheles messeae, A. beklemishevi, and A. maculipennis–were found in the region. The northern boundary of their range is at 65 degrees NL. The greatest species diversity was observed in biotopes of the central region. Within-species chromosome polymorphism was observed in larva populations of all three species. For A. messeae, maximum karyotype diversity indices were established for the southern and northern regions of Karelia.
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