Diptera.info :: Identification queries :: Diptera (adults)
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 Sargus males or females?
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| NJG |
Posted on 16-07-2006 13:00
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Member Location: Oudenaarde - Belgium Posts: 10 Joined: 19.08.04 |
Hi, Does anybody now a simple feature on how to see if a Sargus is a male or a female? The space between the eyes looks always about the same in the specimens that I catch. Stubbs shows the genitals but I find it hard to link the drawings with these specimens in reality. (I would like to be 100% sure about some possible S. cuprarius that I caught in the past...) MVG NJG Belgium |
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| Tony Irwin |
Posted on 22-07-2006 22:39
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 Member Location: Norwich, England Posts: 3306 Joined: 19.11.04 |
Hi Within a species, the male frons is narrower than the female. But in some species the male frons can be as broad as the female frons is in other species, so this is not always easy to use!  If you look at the tip of the abdomen it is usually possible to see the cerci in the female. These are two-segmented, unlike the male surstyli which are only one-segmented, and more hidden. Have a look at http://www.dipter...post_10864 the first picture shows the two segmented cerci clearly (though this is a Chloromyia). Dissection of the females is not a waste of time, because there are good characters in the genital furca which can be used to separate the species. 
Edited by Tony Irwin on 22-07-2006 23:13 Tony ---------- Tony Irwin - http://www.museum.../index.htm |
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...what you prefer, we can discus this, during some good wine, cheese and many new pinned flies!