Very lightweight self-supporting mesh tent

Maybe take a look at the Big Agnes Fly Creek UL2 PLATINUM.

Seems like any of the various inner net products made by the usual suspects (MLD, Locus Gear, Bearpaw, HMG) would work. The Mountain Laurel Designs cuben version is probably the lightest but may require extra care. All require at least one trekking pole and some require two. Alternatively, carbon fiber or aluminum poles may be used.

Hopefully my reply doesn't come off as overly North American centric.

I'd also pay attention to the size of netting, the finer it is, the less air flow you're going to get. It is surprising how well a fine net can stop the breeze.

So if its just mosquitoes that you'd like to stop something like 1.2mm should be enough, which is at least twice the size of noseeums.

Peter,
If you are not interested in buying a tent that comes with a mesh inner (like the Hubba Hubba or the BA above , there are plenty of those types around…) maybe something like this would do :

1.25 kg , W 1,3m x L 2,1m x H 1,25m
http://moskitonetz.com/en/mosquito-tent-ii