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odd fly - Microdon abditus

odd fly - Microdon abditus
Athol, Worcester County, Massachusetts, USA
June 11, 2006
Size: 8mm

Images of this individual: tag all
odd fly - Microdon abditus odd fly - Microdon abditus

Moved from Microdon globosus.

Microdon abditus
Hi Don. I think this is actually Microdon abditus, not globosus. They are similar but the flagellum is much longer on globosus (have a look at the other photos). We are working on the Microdon part of the syrphid field guide this week so I have been looking through some of the bugguide Microdon to see how our guide is working. Jeff

Thanks Don
for both the id and the host species info!

Microdon globosus
Finally got around to looking at the specimen. The host ant is Tapinoma sessile.

I have been watching intently for these again. An amazingly speciose genus in the east with very few adult specimens. Probably diverse because they don't range far from their birthplaces. This one has impressive wing markings.

Syrphidae: Microdon sp,?
If you still have it, I would like it. Alcohol is OK.

I'll put it in alchohol
I saw 2 of these on the same day. It would be great to find out what this odd looking fly is. It's wings even have a dark zigzag pattern.

Microdon globosus or M. pseudoglobus
One or the other - will have to see the specimen and use the key. All we have are old specimens (1920's) of both.

Are you using a key from the Canadian Entomologist revision of this genus? And do you know where I can buy a copy of that paper.

Thompson, F.C. 1981
Revisionary notes on nearctic Microdon flies (Diptera: Syrphidae). Proc. Ent. Soc. Wash., 83: 725-758. We have the other one also, by Novak and Garner, 1977. Haven't looked at them yet. The M. pseudoglobus (or pseudoglobosus) was described by Chris Thompson, so I suspect his 1981 paper will be the most helpful. I just tore the papers out of the journal issues before disposing of them, and put them in our collection library [which is databased]. You may be able to order a photocopy through your public library now.

It does
look like a Microdon, but not a species that I recall ever seeing. I should be able to put a name on it.

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