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View Thread :: Identification queries :: Diptera (adults)
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A stray Bibio lanigerus
John Carr
#1 Print Post
Posted on 06-06-2023 19:15
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Location: Massachusetts, USA
Posts: 9498
Joined: 22.10.10

In 2008 and 2009 in Massachusetts, USA I saw some Bibio that I couldn't place in the regional key (Hardy, 1958). They almost matched Bibio vestitus but the posterior wing veins were dark. I assumed I had made a mistake in the key and forgot about them.

This year I learned we have an introduced population of the European species Bibio lanigerus in northeast USA. It has been observed within ~30 km of the coast from New York City to New Hampshire. It is still outnumbered by native species of Bibio.
John Carr attached the following image:

#2 Print Post
Posted on 06-06-2023 19:30

Location: Soest, NL
Posts: 18217
Joined: 21.07.04

Posterior veins are not dark in (our) lanigerus, somI am not totally convinced. That said, colour of these veins can be very tricky to determine on single pictures …

#3 Print Post
Posted on 06-06-2023 21:27

Location: Pocklington UK
Posts: 213
Joined: 15.08.09

The hind basitarsus looks a little longer than I'd expect in a UK lanigerus.
John Carr
#4 Print Post
Posted on 06-06-2023 21:37
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Location: Massachusetts, USA
Posts: 9498
Joined: 22.10.10

Are there any distinctive features of Bibio lanigerus, if I should collect a specimen?
#5 Print Post
Posted on 07-06-2023 20:51

Location: Soest, NL
Posts: 18217
Joined: 21.07.04

lanigerus normally has yellow hairs on bith thorax and abdomen.
otherwise, not many positive features. It is more like: lacking other characteristic features.
But that is against an European background.
I am totally ignorant as far as the Nearctic fauna is concerned.

In the foto, the hairs on thoracic dorsum seem dark, which is atypical (but not unheard of) in lanigerus.

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Date and time
23 September 2023 11:13


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