A cytogenetic description of a new species of the Anopheles culicifacies ~omplex

Cytogenetic observations on an extensive material of the Anopheles culicifacies complex from the Thenpennai river area, Tamil N adu, South India show that the populations are made up of four cytologically distinct species. Three of these, labeled A, B and C have already been described. A fourth .one, monomorphic for the inversion arrangement + a + b in the X chromosome and il + hI in the second .chromosome, is designated as D, another morphologically indistinguishable sibling species. Each sibling 'species is characterized by a species-specific type of Y-chromosome. Both of these criteria, inversions and Y-chromosomes can be used to distinguish these important malaria vectors. J