Title: Spermatogenesis in the Mosquito, <i>Aedes dorsalis</i> (Meigen)
Abstract: The chromosome morphology and behavior pattern during spermatogenesis in Aedes dorsalis was studied. The results were compared with the findings of similar investigations in other species of mosquitoes. Chromosome preparations were made from testes-tissue of fourth instar and pupal stages by the squash technique and stained with aceto-lactic-orcein. The two testes of an individual may have cells at different divisional stages. Leptotene and zygotene stages of meiotic prophase were not distinguishable. The unwinding of the homologous chromosomes in later stages of prophase I was found to progress at different rates on either side of the centromere. The separation of the chromosomes during anaphase I was mostly synchronous. The polarization of arms of the prophase II chromosomes was observed. The repulsive forces between the sister chromatids in metaphase II were less apparent and the chromosomes at this period were H-shaped in configuration.