This research of Alwar district of Rajasthan presents a detailed taxonomic assessment of insect biodiversity in Jaiamand Lake area. This study aimed to assess insect biodiversity, as well as water quality, ecological distribution and environmental significance. I did this research work in November 2024-December 2024, February 2025- March 2025 and May - June 2025 on Saturday, Sunday and Thursday from 7:00am to 11:00 am and 4:00 pm to 6:00 pm. Insects are one of the most important biological barriers to terrestrial and water ecosystems, Species of insects belonging to six major orders were identified during the study period and 350 specimens of entomofauna of 40 species from 18 families were collected. Order Lepidoptera was observed maximum abudant followed by order coleoptera, Hymenoptera, orthoptera Diptera and Hemiptera, Maximum species richness was observed from 15 families.

Nymphalidae (03 species order - Lepidoptera), Pieridae (05 species order Lepidoptera), Erebidae (05 species order - Lepidoptera), Crambidae (06 species order - Lepidoptera), Pyralidae (02 species order - Lepidoptera), Geometridae (2 species order - Lepidoptera), Boarmiini (2 species order - Lepidoptera), Scarabidae (2 species order - Coleoptera), Dytiscidae (2 species order - Coleoptera), Pentatomidae (2 species order - Hemiptera), Single species from family Gryllidae (order - orthoptera), Hydrometridae (order - Hemiptera), Apidae (order- Hymenoptera), Musca domestica (order - Diptera), Aphidiadae (order - Hemiptera), Tridactylidae (order - Orthoptera), Danaus Chrysippus, Aloa Lactinea, Melipotis cellaris, Two spotted bug and Apis dorsata are the abudance species.