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Keywords from Image Description:
Mochlonyx velutinus last joint of hind tarsus Walker Insecta Britanica Vol page plate XXV. Chaoboridae Chaoboridae Watson and Dallwitz onwards British insects the families of Diptera Version th August archive org page Walker Insecta Britannica Diptera Vols Plate XXV Lovell Reeve London PDold Nematocera anatomy Diptera