Field guides are destined to the more experienced observers. They list all species with a summary of diagnostic characters to separate them from similar species. The more common characters are ommited. Most of the species are illustrated with a photograph.
The keys allow specimens to be name by providing two alternative description at a time. By selecting the proper description and proceeding to the next, the right species will be found (if you selected all the right descriptions).
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Thick headed flies (Diptera: Conopidae). Thick headed flies or Conopid flies are frequent visitors of flowers. Their larvae develop in the abdomen of aculeate Hymenoptera. The female flies onto a host in full flight and deposits an egg between the abdominal segments into the body. Key in English for the Benelux and Great-Brittain. |
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Snipeflies (Diptera: Rhagionidae and Athericidae). Snipeflies are encountered often in the field. They bask on leaves are perch head down on trunks. Keys in English. |
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Stiletto Flies (Diptera: Therevidae). Stiletto Flies look like Robberflies but lack the chitinized proboscis. They are found now and then outside, seldom lin large numbers. Keys in English. |
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Bee-flies (Diptera: Bombyliidae). Diptera with an interesting live history, their larvae are parasites in solitary bee nests. Adults hairy with long tongue, or rather bare with short tongue. Keys in English. |
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Awlflies (Diptera: Xylophagidae). A small family of only a few species. Their larvae live in decaying wood. Key in English. |
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Smell flies (Diptera: Coenomyidae). Adults distribute a strong smell, long after dead. One species in Northwest Europe. |
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Key to the common seashells on the Dutch and Belgian beaches. Key in Dutch. |
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