Thread subject: Diptera.info :: Helophilus sp, Hungary, April 2007

Posted by Xespok on 11-02-2008 16:15
#1
Just a drab H. pendulus or something more interesting?

Posted by Xespok on 11-02-2008 16:16
#2
Another view.

Posted by Xespok on 11-02-2008 16:17
#3
And another view.

Posted by Xespok on 11-02-2008 16:20
#4
A more typical H. pendulus for comparison from May.

Posted by Xespok on 11-02-2008 16:22
#5
Another view of the second ind.

Posted by Xespok on 11-02-2008 16:23
#6
The head with the characteristic dark stripe.

Posted by Andre on 11-02-2008 16:30
#7
H. hybridus female.. PS: you compared it with a male pendulus if I see it correctly Wink

Posted by Xespok on 11-02-2008 16:45
#8
I missed this point completely. I need to resex all my H. images. Actually it started to get suspicious that I always photograph females. It is probably easier to separate males and females by the shape of their abdomen. If pointed - females, if straightish - males.

But why do you think the first one is hybridus? I see that the two flies are very different, but I do not know what is relevant and what is not.

Posted by Andre on 11-02-2008 22:58
#9
Helophilus is one of the few genera where males have the eyes separated like the females (though they stay a little closer to eachother than in females). Yes, the shape of the abdomen is the next best character.
Sorry for my omission: view the tip of the femur 3 and base of tibia 3: hybridus femur with only a very small area yellow, the rest black. Base of tibia is about 1/4 yellow in hybridus, instead of 2/3.