ABDULHAMIDJANSupervised By: Dr. Prof. ManageRetgenet Saleem2026-07-302026-07-301995http://repository.uop.edu.pk/123456789/521During a survey of larvae and pupae of the black flies of N.W.F.P., conducted from November 1992 to October Resta total of 36 species were recorded from 50 sites. The collection was made from 11 districts and one Agency i.e., Abbottabad, Bannu, Chitral, Charsadda, Dir, Kohat, Mansehra, Mardan, Peshawar, Swabi, Swat and Malakand Agency of North West Frontier Province (Pakistan). The study included Taxonomy and Ecology of preimaginal stages considering, breeding preferences, substratum preferences, physical parameters of water bodies like water temperature (10-36°C), speed (31-89 cm/sec.), transparency (20-40cm), depth (14-55cm), breeding altitude (285-2800 m), humidity (10-80%) and rainfall (4-100 mn), and chemical parameters like PH (5.7-7.5), NH;-N (.03-.089 ug/cm*), Co; (.199-.9 mn/L), HCo; (.108-.79 mm/L), Cl (0.061- 0.401 mm/L) and Ca** (1.1-3.9 mm/L) .enThesis