Abstract: The term nocturnality refers to those insects which remain energetic during night time and remain less energetic during day time. They totally depend upon colour signals for hunting, courtship alignment and escaping from predator. Insects play an important role in ecosystem like, pollination, decomposition, nutrient cycling and aeration in soil. As the flowering season comes, the number of species belonged to different orders like Hymenoptera, Lepidoptera, Diptera and Coleoptera increases, because the members of these orders mostly stay in the flowers.