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The Society for the study of flies (Diptera)

Affiliated to the British Entomological and Natural History Society (BENHS)

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#1 2018-01-06 16:16:53

IanCarle
DF Members
Name: Ian Carle
From: Herts
Registered: 2016-07-28
Posts: 79

Couple of hoverflies and a cranefly

Hi Folks
Just a few unidentified images left from last year for which I'd be grateful for your id help again! The pictures were taken at Frogmore Meadows SSSI 02/09/2017 and 13/08/2017 for the Chrysotoxum bicinctum.

Thanks

Ian

1 & 2 - female hoverfly (TQ021988)
2a - Chrysotoxum bicinctum (TQ020989)
3,4,5 cranefly (TQ021988)


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#2 2018-01-06 17:59:34

andrewsi25
DF Members
Name: Ian Andrews
From: Pocklington, East Yorkshire
Registered: 2008-07-11
Posts: 247

Re: Couple of hoverflies and a cranefly

Platycheirus albimanus for the hoverfly.

Ian

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#3 2018-01-06 21:52:08

Geoff F
DF Members
Name: Geoff Foale
From: South Devon
Registered: 2014-05-12
Posts: 172

Re: Couple of hoverflies and a cranefly

The second hoverfly is Chrysotoxum bicinctum. It is a little bit of an oddity because it lacks any yellow on tergite 3 but this thin line is variable.

I would like to see more angles for the cranefly but my guess would be Tipula lateralis.

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#4 2018-01-07 20:07:48

IanCarle
DF Members
Name: Ian Carle
From: Herts
Registered: 2016-07-28
Posts: 79

Re: Couple of hoverflies and a cranefly

Thanks Ian and Geoff. I'm afraid I don't have any more images of the cranefly which is a shame as I guess we may not be able to give a positive id for it. Is there a particular feature that you are hoping to see Geoff?

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#5 2018-01-07 22:00:08

Geoff F
DF Members
Name: Geoff Foale
From: South Devon
Registered: 2014-05-12
Posts: 172

Re: Couple of hoverflies and a cranefly

I think I am in the general area with this cranefly. The thorax markings look suitable for the Yamatotipula group, as far as I can tell from those angles. Thereafter, the markings look possible for lateralis, such as darkened edge to the lower basal cell.

But the keys then concentrate on close inspection of tergite 9/sternite 8 so what I would really like to see is the appearance of John or another real expert to confirm or change my first quick guess.

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#6 2018-01-07 23:26:25

IanCarle
DF Members
Name: Ian Carle
From: Herts
Registered: 2016-07-28
Posts: 79

Re: Couple of hoverflies and a cranefly

Thanks Geoff, it's helpful to know what the keys say so I can get the right angles covered next time. I've booked on an introductory cranefly course at BEHNS so hope to get some more clues then!

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