[Syrphidae] Re: Merodon trochantericus on the Channel Islands

[x.lair at laposte.net]

Dear Steven, 

I'm not really surprised by Tim Ransom's discoverey in Jersey: Merodon trochantericus is also present all along Manche coast, between Cotentin and Mount Saint-Michel. From North to South: 
Biville - 04/07/2006, dunes (Xavier Lair) 
Carteret - 28/06/2007, coastal cliffs (Philippe Sagot) 
Blainville-sur-mer - 24/07/2004 dunes (P. Sagot) 
Champeaux - 09-12/08/2006 coastal cliffs, on Scilla autumnalis (X. Lair) 
Carolles - 14/06/2005 coastal cliffs on Jasiona (X. Lair) 

I also found it on Brittany coast in 2010 (2 localities in Finistère). 
Adults on M. trochantericus can be found on on Scilla autumnalis on later summer in cliffs, it's not impossible that the larvae feed with this plant (Liliaceae) 
M. trochantericus is probably present in Manche since a long time, we found it when we seriously started inventory hoverflies in Manche in the years 2000... 
Maybe this species shows a thermo-atlantic distribution, such as other species (Tabanus eggeri, Podalonia luffii, or Chrysis grohmanni, Lasioglossum smeathmanellum) all present in Manche but absent inland and in most of North-West European countries. 

If needed, i will send you the previous published data with M. trocanhtericus in Normandy and Brittany. 
Best wishes 

Xavier Lair 


----- Mail original -----

De: "Steven Falk" <steven at sfalk.wanadoo.co.uk> 
À: "Hoverfly discussion list" <syrphidae at lists.nottingham.ac.uk> 
Cc: "tim ransom" <timransom at hotmail.com> 
Envoyé: Mercredi 19 Août 2015 20:36:51 
Objet: [Syrphidae] Merodon trochantericus on the Channel Islands 

Dear All, 
Tim Ransom has found a Merodon on Jersey that is clearly not equestris but may be trochantericus. Who would be the best prson to check it? 
Best wishes, 
Steven 
Steven Falk 
Artist-Naturalist-Photographer 
www.stevenfalk.co.uk 
Wildlife identification resources at: 
http://www.flickr.com/photos/63075200@N07/collections/ 


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