Posted by David Clements on 16-10-2011 20:16
#5
This certainly appears to be a male Conops vitellinus. The key features in the male are the extent and shape of yellow markings on the tergites, and the ratio of proboscis length to head height, which should be <1.2 for vitellinus (this specimen is 1.1 as measured from the image). >1.3 would suggest quadrifasciatus, which is very similar. My 1997 paper in Dipterists Digest (3: 49-53) refers - I can send a PDF if wanted. Regards D.