Adult dragonflies are distinctly sexually dimorphic. Usually there is only one type of female. However, in some Indian (and other) genera female polymorphism has also been recorded (e.g. F.C. FRASER, 1934, The fauna of British India, Odonata, Vol. 2, Taylor & Francis, London), one female form being isomorphic to the male. The males of 7 Indian members of the genus Neurothemis generally possess dark coloured wings, while the females are strikingly different; so much so that in some earlier works they have erroneously been described as different species. FRASER (cf. above) recorded the occurrence of hetero- and isomorphic females in N. fulvia (Dru.)and N. fluctuans IFabr.), but there are no records of female polymorphism in other Indian Neurothemis species. Recently the author has collected an andromorphic female of N. t. tullia (Fig. 3), which differs markedly from the usual heteromorphic form (Fig. 2) and looks exactly like the male (Fig. I). It is being described here.