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<DIV dir=ltr align=left><SPAN class=827411711-10022016><FONT color=#0000ff
size=2 face=Arial>Hi Malin</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=827411711-10022016><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=827411711-10022016><FONT color=#0000ff
size=2 face=Arial>Females of both these species are generally darker,but there
is considerable variation in both sexes and all-dark specimens exist in both
sexes. But the shape and width of frons is most reliable, and in
arbustorum, even a pale female looks very different to a plane male i.e. the
patterns are different. But just using 'brightness' alone is not relaibale.
For more info, see my Flickr feature: <A
href="https://www.flickr.com/photos/63075200@N07/collections/72157629778653197/">https://www.flickr.com/photos/63075200@N07/collections/72157629778653197/</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=827411711-10022016><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=827411711-10022016><FONT color=#0000ff
size=2 face=Arial>You also need to account for the other Ersitalis species that
fly alongside tenax and arbustorum.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=827411711-10022016><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=827411711-10022016><FONT color=#0000ff
size=2 face=Arial>Good luck,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=827411711-10022016><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=827411711-10022016><FONT color=#0000ff
size=2 face=Arial>Steven</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV align=left><FONT size=2 face=Arial>Steven Falk BSc ARCS FRES</FONT></DIV>
<DIV align=left><FONT size=2
face=Arial>Entomologist-Artist-Photographer</FONT></DIV>
<DIV align=left><FONT size=2 face=Arial><A
href="http://www.stevenfalk.co.uk/">www.stevenfalk.co.uk</A></FONT></DIV>
<DIV align=left><FONT size=2 face=Arial>mobile: 0781 555 7263</FONT></DIV>
<DIV align=left><FONT size=2 face=Arial>Twitter: @StevenFalk1</FONT></DIV>
<DIV align=left><FONT size=2 face=Arial></FONT> </DIV>
<DIV align=left><FONT size=2 face=Arial>Help Our Bees: <A
href="http://www.stevenfalk.co.uk/help-our-bees">http://www.stevenfalk.co.uk/help-our-bees</A></FONT></DIV>
<DIV align=left><FONT size=2 face=Arial></FONT> </DIV>
<DIV align=left><FONT size=2 face=Arial>Flickr Image library at:</FONT></DIV>
<DIV align=left><FONT size=2 face=Arial><A
href="http://www.flickr.com/photos/63075200@N07/collections/">http://www.flickr.com/photos/63075200@N07/collections/</A></FONT></DIV>
<DIV align=left><FONT size=2 face=Arial></FONT> </DIV>
<DIV align=left><FONT size=2 face=Arial>LinkedIn profile: <A
href="https://www.linkedin.com/in/steven-falk-aa8ba817">https://www.linkedin.com/in/steven-falk-aa8ba817</A></FONT></DIV>
<DIV align=left> </DIV>
<DIV> </DIV><BR>
<DIV lang=en-us class=OutlookMessageHeader dir=ltr align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> syrphidae-bounces@lists.nottingham.ac.uk
[mailto:syrphidae-bounces@lists.nottingham.ac.uk] <B>On Behalf Of
</B>Malin<BR><B>Sent:</B> 10 February 2016 08:16<BR><B>To:</B>
syrphidae@lists.nottingham.ac.uk<BR><B>Subject:</B> [Syrphidae] Sex
identification based on abdomen coloration<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Hi,</DIV>
<DIV><BR></DIV>
<DIV>During this years field season I have started to consider whether the
coloration of the abdomen can help in sex identification, particularity of<I>
Eristalis tenax </I>and <I>Eristalis arbustorum</I>. My feeling is that the most
brightly coloured individuals appear to be male, whereas the individuals with
darker colours could be either male or female. Have anyone noted something
similar or do you have another way to quickly determine sex in the field (except
for the difference in eye morphology, which even though useful can be a bit
tricky in some field situations)?</DIV><BR>
<DIV apple-content-edited="true">
<DIV>
<DIV>Best Regards</DIV>
<DIV>Malin Thyselius</DIV>
<DIV><BR></DIV></DIV></DIV><BR><PRE>
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