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Keywords from Image Description:
Ula sylvatica head Francis Walker Insecta Britanica Vol page plate XXVII. Ula sylvatica Meigen Ula sylvatica Meigen Watson and Dallwitz onwards British insects the families of Diptera Version th August archive org page Walker Insecta Britannica Diptera Vol III plate XXVII PDold Tipulomorpha heads Ula sylvatica