Japanese Encephalitis and Problem in Vector Surveillance: An Introduction -- Mosquito Surveillance Tools Used and Methodology Followed in Ecological Study on JE Vectors in Northern India -- Pictorial Key to Common Species of Culex(Culex) Mosquitoes Associated with Japanese Encephalitis Virus in India -- BPD Hop Cage Method for Effective JE Vector Surveillance -- Ecology of Culex tritaeniorhynchus in and Adjoining Areas of Delhi, Non endemic Area in Northern India, with Special Reference to Chilodonella uncinata as a Bio-control Agent -- Ecology of Culex tritaeniorhynchus in Karnal District (JE Endemic Area), Haryana State in Northern India -- Ecology of Mosquito Vectors of Japanese Encephalitis Virus in Saharanpur District (JE Endemic Area), Uttar Pradesh State in Northern India