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 Eristalis x3
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| lagura |
Posted on 05-10-2009 23:17
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 Member Location: Helsingborg, Sweden Posts: 1241 Joined: 24.10.08 |
I don't seem to be able to figure the Eristalis' out. Lovely flies but oh so variable. These three was photographed the same day and roughly at the same place. I believe the first two to female and male E. pertinax and the third to be a female E. tenax. But I wouldn't be surprised if it was the other way around  Size: ~14mm Date: 7 September 2009 Location: On raspberry leaves on a small meadow (Helsingborg, Sweden) Thanks! Here's the first female lagura attached the following image:  [163.86Kb]  |
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| lagura |
Posted on 05-10-2009 23:18
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Member Location: Helsingborg, Sweden Posts: 1241 Joined: 24.10.08 |
And the male. Size: ~12mm
lagura attached the following image:  [154.43Kb] |
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| lagura |
Posted on 05-10-2009 23:20
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Member Location: Helsingborg, Sweden Posts: 1241 Joined: 24.10.08 |
And the other female. Size: ~16mm
lagura attached the following image:  [185.35Kb] |
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| Andre |
Posted on 06-10-2009 10:54
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 Member Location: Tilburg, the Netherlands Posts: 2111 Joined: 18.07.04 |
It's the other way round Eristalis pertinax is the only species with all yellow front and middle tarsae. Also, look carefully at the color of the spots on the abdomen. In pertinax they can be very faint to very clear, but the color is always yellowish. In tenax they can also be very faint (to absent) to very clear, but the color always tends to be reddish. From these pics the two vertical 'bands' of hairs over the eyes of tenax are not clearly visible, but that can be a very useful character too. The stigma on the wing of pertinax, as you see very clear here, is usually quite long, whereas in tenax it is usually about half that length. |
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| lagura |
Posted on 06-10-2009 19:19
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Member Location: Helsingborg, Sweden Posts: 1241 Joined: 24.10.08 |
I had a feeling it would be  Thank you very much for your reply and the info Andre. I will save it for future needs. |
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| Andre |
Posted on 06-10-2009 22:12
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Member Location: Tilburg, the Netherlands Posts: 2111 Joined: 18.07.04 |
Maybe, one day, you decide to start collecting Syrphidae? |
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