#1
I take pictures of insects (all), but the lack of biological education does not identify the material. I beg to give all possible assistance in the definition.
Russia, South-East of Moscow region, a garden plot in the countryside,
2014.06.05
#3
It's a female Eristalis picea. Dark hairs and dull bands on the abdomen, dark metatarsus of hind leg, dark marking in the wing are the features to look for.
Greetings,
Ectemnius