A wide Array of people is attracted to the fascinating world of insects, especially because of their morphology and interesting ways of life.In entomology, insect has received considerable attraction from persons concerned with the environment.Estimates of the total number of insect species in the world range from one million to thirty million species but widely acceptable figure would probably be around five million.Anyhow about 9,00,000 insect species have been named and described and many more are being identified each year.since many years, there has been a pressing demand, from the students of Entomology for a handy book of insect and their orders. An effort has been made to provide the characters and information, which is classify the insects into related orders and their habit