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48Ravindran and WilliamsTable I. Mosquito species observed breeding in different habitats in the study areaSpecies Rice Irrigation Draw wells Puddles Hoof- Bedfields wells prints poolsAnophelinesAn. subpictus + + + + + +An. vagus + + + + + +An. peditaeniatus + - - - - -An. nigerrimus - + + + + +An. barbirostris + + + + + +An. stephensi - + + + + +An. aconitus - + + - - -An. splendidus - + - - - -An. annularis - - + + - +An. pallidus - - - + + +An. culicifacies - + + + + +CulicinesCx. tritaeniorhynchus + + + + + +Cx. vishnui + + - + + -Cx. pseudovishnui + - - - - -Cx. bitaeniorhynchus + - - - - +Cx. gelidus - + + - - -Cx. fuscocephala + - - + - -Cx. (Lutzia) fuscanus + + + + + -Cx. (Lophoceraomyia) sp. - + + - - -Cx. vegans - - - - + -Cx. quinquefasciatus - + + + + +Ae. vittatus - + - - - -Ae. scathophagoides - - - + - -Ae. aegypti - - + - - -Ae. vexans - - - + - -Irrigations wells supported breeding of 15 species of monsoon season and An. culicifacies, An. nigerimus,mosquitoes. An. barbirostris, An. subpictus, An. Cx. vishnui, Cx. (Lophoceraomyia) species and Ae.vagus, Cx. quinquefasciatus and C x . vittatus were found breeding exclusively in posttritaeniorhynchuswere potential breeders and were monsoon season. All other mosquitoes were foundencountered breeding for more than 20 weeks. An. breeding in both seasons. An. stephensi, An.aconitus, An. splendidus, Cx. vishnui, Ae. vittatus, subpictus, An. splendidus, An. Aconitus, Cx.were very poor breeders and were obtained in less than quinquefasciatus and Cx. gelidus showed preferencefive weeks during the course of observation. Among to breed at a well-depth greater than 15 feet, whereasmalaria vectors, An. stephensi was predominant being An. barbirostris, An. vagus, An. nigerrimus, Cx.observed in 18 of the total 30 weeks of observation tritaeniorhynchus and Cx. (Lophoceraomyia) sp. atwhen compared to An. culicifacies, which was shallow levels with depth of less than five feet. Chiobserved breeding only in two weeks and during post- square analysis performed on species obtained at allmonsoon season. Rapid urbanization in rice well depths indicated preference of An. stephensi, An.cultivation area adjoining extended areas may be the barbirostris, An. vagus, Cx. quinquefasciatus and Cx.reason for prolific breeding of An. stephensi in these gelidus to breed at different well depths (Table III).irrigation wells. Seasonal breeding preference in Irrigation wells may act as foci for mosquito breedingirrigation wells was noticed (Table II). An. aconitus during non-monsoon seasons and non-rice cultivationand An. splendidus were found breeding in pre- periods.