Hermann August Hagen
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Hermann August Hagen (1817 - 1893) was a German entomologist who specialised in Neuroptera and Odonata. In 1845 he began to collaborate with Edmond de Sélys Longchamps .
Some of the terms used by Hagen were not well explained. This was corrected by the Irish Entomologist Alexander Henry Haliday in 1857 (Explanation of terms used by Dr Hagen in his synopsis of the British Dragon-flies. Entomologists' Annual 164-15. Fig.)
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