The phenology of dragonflies in the Dehra Dun Valley, India

Seasonal distribution of some Indian species, which centers largely around different types of larval habitats, is discussed. Two main types of larval habitats are present in the valley, viz. the perennial streams, and seasonal monsoon ponds. The observations seem to indicate that in the species developing in perennial streams, the larval period is prolonged for some 5-8 months, while the adults are on wings for not less than 3-4 months. On the other hand, the larval period of species breeding in seasonal monsoon ponds is shortened to about 2-4 months, while their adult life span is prolonged to 8-9 months.