Thread subject: Diptera.info :: Dysmachus trigonus?
#1
Checking before I put them in the gallery.
About 10 days ago (3 June) I stumbled upon these two flies in copule. Even though the tempreature was running towards the 30's I could come very close (my camera is not that much state of the art) and shoot a few shot. The sun prevented me to see if any was really any good, but i am quite satisfied. Size about 12-13 mm (each), on bare, sandy soils.
#4
Yours look not quite so bristly as mine, which Mark van Veen IDed as
trigonus.
#5
Danny? Can you tell more?
Posted by
conopid on 11-10-2007 13:59
#6
Paul,
i find that the best feature to determine Dysmachus trigonus is the "fans" of long hairs at the margins of the tergites. These show up best when viewed dorsally. I cannot make these out in your photos, but the angle is not good for viewing this feature. Did you get any dorsal shots?
#7
Hello Paul,
yes, I think it is Dysmachus trigonus. Other Dutch species with (nearly) completely black legs would not fit other characters seen in your image. Do you have a detail of the genitalia? Shape of the ovipositor is very characteristic in trigonus.
Greetings, Danny
Posted by
conopid on 12-10-2007 08:44
#8
Paul,
I agree with Danny. On closer inspection of the third photo, you can easily see some of the fans of hairs sticking out above the abdomen - on the opposite side of the abdomen from the camera.
Edited by
conopid on 12-10-2007 08:47
#9
I have to dig up the original images.
#10
The easiest characters for ID-ing this species in the Netherlands is the combination of black legs and the bristles on the thorax, going all the way to the head, in stead of being restricted to the posterior part.
John