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Diptera.info :: Family forums :: Syrphidae
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Syrphid (?) With Huge Femur
Bruce Marlin
#1 Print Post
Posted on 27-12-2004 19:22
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Location: Chicago, Illinois USA
Posts: 59
Joined: 12.12.04

Hello All,
I hope you can help me identify this fly.
Pictures were taken July 1st, near Chicago, USA. The fly is nectaring on milkweed flowers (Asclepius spp.). I call him the femur fly, for obvious reasons... Thanks in advance!
Bruce Marlin

www.diptera.info/forim/7-0146-1.jpg

www.diptera.info/forim/7-0146-2.jpg

www.diptera.info/forim/7-0146-3.jpg
 
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Paul Beuk
#2 Print Post
Posted on 28-12-2004 07:48
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Hello Bruce,

I think this is a species of Tropidia, maybe Tropidia quadrata but there are seven other species in North America. There are not many genera with such an apical flange on the hind femur. The (imported) European Merodon equestris has it, but mimic bumblebees.
Resembling Tropidia are some Cynorhinella, but these have a face that projects anteroventrally and the face itself is less swollen and has a very distinct median knob.
Paul

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Bruce Marlin
#3 Print Post
Posted on 31-12-2004 16:40
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Location: Chicago, Illinois USA
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Thanks for that ID, Paul. Any idea if this is a male or female?
 
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Gerard Pennards
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Posted on 01-01-2005 12:56
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Location: Amersfoort
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Hoi Bruce,
Happy newyear!!Grin
I can tell you that this is a male.
In a lot of species of Syrphidae this is very easy to see, because in males the eyes touch over a certain distance on the upper side of the head, whereas in females there is a space in between the eyes!
But caution should be taken, this is NOT the case in all genera of syrphids. In that case it is better to look at the tip of the abdomen. Males always have a knob-like structure (as in your Sarcophaga sp.!), and in females this end of the abdomen is more flat without much to see! So, this is a male because of the touching eyes and the knob that you can see very well on your second picture!
And yes, Syrphids are one of the most beautiful families of flies! GrinGrin

Greetings,
Greetings,
Gerard Pennards
 
Bruce Marlin
#5 Print Post
Posted on 01-01-2005 21:02
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Location: Chicago, Illinois USA
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Joined: 12.12.04

Hi Gerrard,
Happy New Year to you, and everyone!

You guys are a wealth of information, and an invaluable help to a rank amateur such as myself. Geeze, I have to learn stuff when I come here! (No, really, I find myself hitting the books and the dictionaries just to learn the terminology so I sort-of-half know what you're talking about.) I never knew about the eye distance being a gender indicator, for instance. Argh.

Good thing ignorance can be cured, eh?
Thanks for all the help.
-Bruce
 
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27.12.22 21:10
Thanks, Jan Willem! Much appreciated. Grin

19.12.22 11:33
Thanks Paul for your work on keeping this forum available! Just made a donation via PayPal.

09.10.22 17:07
Yes, dipterologists from far abroad, please buy your copy at veldshop. Stamps will be expensive, but he, the book is unreasonably cheap Smile

07.10.22 11:55
Can any1 help out with a pdf copy of 1941 Hammer. Vidensk. Meddel. Dansk Naturhist. Foren. 105; thank you

05.10.22 19:59
Found! https://www.veldsh
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@zeegers, your book seems difficult to get from Spain, is there another way?

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Ladies and gentlemen https://jeugdbonds
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Lis - This is vol.11 (eleven) and is 346 pages. Sorry, don't have a copy.

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