Posted by
Sundew on 27-07-2013 13:35
#3
Indeed a female
Chrysotoxum. With the key
http://web.archiv...x_key.html, I arrive at
Chrysotoxum cautum, as the third antennal segment seems to equal segments 1 + 2. Unfortunately, I cannot see the character: "female: unique among European
Chrysotoxum in possessing a longitudinal, median, membranous strip on abdominal tergite 6, which effectively divides this tergite into two parts". Also the scutellum is unusually dark. So here I am at my wits' end!
Regards, Sundew
Posted by
Sundew on 27-07-2013 18:36
#5
Ah - in this case "Wing: front margin yellowish with a distinct dark spot in the top half; abdomen elongate; large species: 13-17 mm" is a good description in the key. As to the antenna, segment 3 has to be longer than 1 + 2 to get to
Ch. fasciolatum. So my estimation was wrong
.
Good to have true experts here!