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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>Dear Malin and others,</DIV>
<DIV> </DIV>
<DIV>For Eristalis arbustorum I’m quite convinced that it is by far more easy to
distinguish males and females in the field than to distinguish between females
of Eristalis arbustorum, E. abusiva (in Europe) and E. brousii (in
North-America) and between males of these species. It is not only the color
distribution, but also the brightness of the orange spots. And males tend to
have more hairy bodies. However, there is a rather small proportion of really
dark males and really light females that do overlap in coloration. </DIV>
<DIV>So in my opinion anyone who claims to have recognised one of these species
in the field should for sure be able to say what sex it was. </DIV>
<DIV> </DIV>
<DIV>In E. tenax it is quite difficult due to huge variation in coloration. The
males being much more orange, the females being much more black, but with a very
extensive overlap. The form of the abdomen might be a bit more helpful, but I
only sex them based on the separation of the eyes. </DIV>
<DIV> </DIV>
<DIV>In E. intricarius (hair coloration) and E. pertinax (form of abdomen) it is
quite easy to separate almost all specimens.</DIV>
<DIV> </DIV>
<DIV>best wishes,</DIV>
<DIV> </DIV>
<DIV>Wouter</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'>
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<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A
title=Francis.Gilbert@nottingham.ac.uk
href="mailto:Francis.Gilbert@nottingham.ac.uk">Francis Gilbert</A> </DIV>
<DIV><B>Sent:</B> Wednesday, February 10, 2016 9:24 AM</DIV>
<DIV><B>To:</B> <A title=syrphidae@lists.nottingham.ac.uk
href="mailto:syrphidae@lists.nottingham.ac.uk">Hoverfly discussion list</A> ; <A
title=malin.thyselius@gmail.com
href="mailto:malin.thyselius@gmail.com">malin.thyselius@gmail.com</A> </DIV>
<DIV><B>Subject:</B> [Syrphidae] Re: Sex identification based on abdomen
coloration</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
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<P class=MsoNormal><SPAN
style='FONT-SIZE: 11pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #1f497d; mso-bidi-font-family: "Times New Roman"'>hi
Malin<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 11pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #1f497d; mso-bidi-font-family: "Times New Roman"'><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 11pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #1f497d; mso-bidi-font-family: "Times New Roman"'>Do
you know the attached papers? Graham Holloway did a lot of work on the variation
in colour pattern in arbustorum, and Jon Heal also on tenax, arbustorum and
intricarius</SPAN></P>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 11pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #1f497d; mso-bidi-font-family: "Times New Roman"'><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 11pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #1f497d; mso-bidi-font-family: "Times New Roman"'>Best
wishes<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 11pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #1f497d; mso-bidi-font-family: "Times New Roman"'><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style='FONT-SIZE: 11pt; FONT-FAMILY: "Calibri","sans-serif"; COLOR: #1f497d; mso-bidi-font-family: "Times New Roman"'>Francis<o:p></o:p></SPAN></P>
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<DIV>
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style='FONT-SIZE: 8pt; FONT-FAMILY: "Tahoma","sans-serif"; COLOR: #1f497d; mso-fareast-font-family: "Times New Roman"; mso-no-proof: yes'>Dr
Francis Gilbert<o:p></o:p></SPAN></P>
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style='FONT-SIZE: 8pt; FONT-FAMILY: "Tahoma","sans-serif"; COLOR: #1f497d; mso-fareast-font-family: "Times New Roman"; mso-no-proof: yes'>Professor
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B132, Biology Building, School of Life Sciences<o:p></o:p></SPAN></P>
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style='FONT-SIZE: 8pt; FONT-FAMILY: "Tahoma","sans-serif"; COLOR: #1f497d; mso-fareast-font-family: "Times New Roman"; mso-no-proof: yes'>University
Park, University of Nottingham, Nottingham NG7 2RD, UK<o:p></o:p></SPAN></P>
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style='FONT-SIZE: 8pt; FONT-FAMILY: "Tahoma","sans-serif"; COLOR: #1f497d; mso-fareast-font-family: "Times New Roman"; mso-no-proof: yes'>Tel:
+44 (0) 115 951 3215<o:p></o:p></SPAN></P>
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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<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p></o:p> </P>
<DIV>
<P class=MsoNormal><SPAN
style='mso-fareast-font-family: "Times New Roman"'>Hi,<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style='mso-fareast-font-family: "Times New Roman"'><o:p></o:p></SPAN> </P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style='mso-fareast-font-family: "Times New Roman"'>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)?<o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><SPAN
style='mso-fareast-font-family: "Times New Roman"'><o:p></o:p></SPAN> </P>
<DIV>
<DIV>
<DIV>
<P class=MsoNormal><SPAN style='mso-fareast-font-family: "Times New Roman"'>Best
Regards<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style='mso-fareast-font-family: "Times New Roman"'>Malin
Thyselius<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style='mso-fareast-font-family: "Times New Roman"'><o:p></o:p></SPAN> </P></DIV></DIV></DIV>
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