Two new species of Couchia parasitic in midge eggs

Two new species of Couchia are described as parasites in the eggs of midges . Couchia amphora sp. nov. typically produces terminal flask-shaped zoospor angia with occasional secondary zoosporangia arising by basipetalous succes sion. Oogonia contain oospores, which usually fill the oogonium. Couchia li mnophila sp. nov, typically produces broadly ellipsoidal zoosporangia which are single and terminal, but sympodial renewal may rarely occur. Oospores of C. limnophila do not usually fill the oogonium. The new species are cont rasted with the previously described C. circumplexa which, like C. limnophi la, typically produces broadly ellipsoidal zoosporangia and which, like C. amphora, usually produces oogonia whose oospores fill the oogonium. Couchia circumplexa differs from both new species in renewing its zoosporangia by internal proliferation. Typical morphological forms and configurations of a ppressorial complexes produced by each of the three species are useful in s pecies determination, however such usefulness is limited by the intergradat ion of forms among the three species. Drawings and full descriptions are in cluded to aid in identification of the new species.