Migrations of Leptophlebia vespertina L. and L. marginata L. (Ins.: Ephemeroptera) in the estuary of a coastal stream Diel rhythmic pattern of Leptophlebia marginata L. and L. vespertina L. (Ephemeroptera) ‘VESPERTINAL MIXTURE’: MICHAEL LONGLEY’S A HUNDRED DOORS Thucididean time-reckoning and Euctemon's seasonal calendar Experimental studies on nymphal growth in Leptophlebia vespertina (L.) (Ephemeroptera) The life cycles of Leptophlebia vespertina (L.) and L. marginata (L.) (Ephemeroptera) in Llyn Dinas, North Wales The Growth of Coenis horaria (L.), Leptophlebia vespertina (L.), and L. marginata (L.) (Ephemeroptera) Some Aspects of the Ecology of Leptophlebia Vespertina (L.) (Ephemeroptera: Leptophlebiidae) Some Aspects of the Ecology of Leptophlebia Vespertina (L.) (Ephemeroptera: Leptophlebiidae) Comparative studies on the development of Leptophlebia vespertina (L., 1767) (Ephemeroptera, Leptophlebiidae) in regenerating bogs