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The Society for the study of flies (Diptera)

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#1 2018-03-13 18:12:39

JohnShowers
Committee
Name: John Showers
From: Northants
Registered: 2008-02-28
Posts: 72
Website

Stevenia atramentaria males

I swept two males of this species (I think) at Ditchford Lakes and Meadows Nature Reserve SP933680 on 26.v.2017 during the Dipterists Forum Spring Field Meeting. They keyed out straightforwardly to this species using Steven Falk's Draft Test Key to British Blowflies and Woodlouse Flies. Here are some rather poor photos taken with a bridge camera indoors. As this is reportedly a scarce fly it would be good to have it confirmed. I have upped the contrast and brightness to try to show the dusted dorsocentral stripes on the thorax and and dusting on the basal corners of the tergites. It has longish hairs on the arista, but not plumose and the palpi and antennae are entirely black.


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#2 2018-03-14 15:51:09

conopid
DF Members
Name: Nigel Jones
From: Shrewsbury
Registered: 2008-02-27
Posts: 656
Website

Re: Stevenia atramentaria males

Have you compared with Steven's photos here: https://www.flickr.com/photos/63075200@ … 345084836/ ?


Nigel Jones
Shropshire

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#3 2018-03-19 14:28:19

jeremyr
DF Members
Name: Jeremy Richardson
From: Tottenham
Registered: 2012-12-31
Posts: 224

Re: Stevenia atramentaria males

atramentaria is very common in parks across north london. This one looks ok, you could also check beneath the mid femur to see if it has a row of short spinules, pictured here https://www.flickr.com/photos/124453649 … 736225500/

Jeremy

edit: I should add that the spinules just confirm the genus, to confirm atramentaria you need to check that outer verticals are present

Last edited by jeremyr (2018-03-19 14:55:52)

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#4 2018-03-19 19:52:51

JohnShowers
Committee
Name: John Showers
From: Northants
Registered: 2008-02-28
Posts: 72
Website

Re: Stevenia atramentaria males

Thank you both for the tips. The middle femur spinules and outer verticals are both present and my specimens match the photos so I am happy with Stevenia atramentaria.
Regards
John

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