The larva feeds on earthworms and larvae of other flies. 
Coenosia tigrina is a robber fly and catch flies. You would not expect that when you see this fly. In greenhouses they can be useful. 

   Photo 12-6-2010

It is a shiny green fly like the Greenbottle. 
It also has black bristle-like hair on the thorax. But in the center are some hairs missing. That 's a difference.
Sometimes the Greenbottle  misses hairs in the center too. But less.

  Watch your head!!!

    Photos 7-3-2010

There are two very similar species. Namely Graphomya minor en G. maculata.

In 2010 I have made clearer photos with a new camera.
There are three species in the Netherlands with different characteristics. Being such a small fly is that it is difficult to identify.

               Last three photos: May 2010                
If the halteres brown / black: Hebecnema nigra
If the halteres are yellow .....
With hairless eyes: Hebecnema vesper tina With hairy eyes: Hebecnema umbritica
The halteres are yellow. The eyes hairless. So Hebecnema vesper tina.
This information I have from Joke van Erkelens. (Thanks Joke) There were other features. But then it becomes very complicated.

It's a springfly. 
Here it is on the dead apple tree in the sun.
The family is somewhat similar to the Phaonia family. They also have the dark cross veins. The legs are quite dark.

  These two photos: 9-4-2010

Tibia 1 has a posterior seta and tibia 2 has 2-3 posterior seta. 
H. confinis(female) has vague spots on the abdomen and the eyes are not hairy. 
Because I can't see the hairs on the bactibia , H. confinis is not entirely sure.
The differences of  Helina species are very small. Helina pertusa par example maybe would be possible .
Thanks for the information Joke van Erkelens. 

Tibia  means shin.
Seta means bristle
Posterior: Coming after in order; following.

I like the eyes.

Determined again by Joke van Erkelens. Very similar to Helina confinis.

Explanation of Joke van Erkelens:
The combination of crossveins obscured yellow legs + 3 + dorso exchange can only with H.depuncta
(at least from the Dutch species.)
H.impuncta + H. pertusa also have darkened the crossveins + yellow legs ... but both dorso Centrals 4.
According to Joke, there are  more differences in characteristics between the flies, but that's very complicated.

June - October.

See explanation: dorso centrals

A dark fly with some distinct stripes

I don't know the species. In the Netherlands there are three known. Morellia aenescens, Morellia hortorum and Morellia simplex

Under: two photos of a Morellia spec. on Goldenrod.

Autumn house-fly, but not only in autumn. This fly I photographed in April. In winter you can find them in houses where they will overwinter. In spring they become active again.. 
In summer cattle and horses don't like them, because they feed on manure juices. But thy also feed on plant sugars. 
Two generations.   Larvae in fresh cattle manure.

  female Photo's 28-5-2010

  male Photos: 9-4-2010

Klick here for more information.

Antennea: black and red Legs: black

Klick here for more information.

In the wing of the Muscina prolapsa  the vein M1 has a sharp curve at the end. The vein of the wing of the similar M. pascuorum  not.

Neomyia spec. Family House flies (Muscidae) 

An other a shiny green housefly. You can recognize the neomyia on the shiny green top of the head.
In the Netherlands there are the species Neomyia cornicina and Neomyia triggerfish
I don't know wich species I have.

   Photo 28-5-2010

On a kingcup, marsh marigold . Photo: 23-4-2010

  Photo 7-3-2010

Phaonia valida looks like Phaonia Erran. Vein R4+5 in the wing runs into an arc at the end and this vein of P.errans is straighter. (The vein, which ends at the top of the wing.)
The vein M1 has at the end a weak arc. In the wing of P. Erran M1 is straighter.

        Foto 3-7-2010

Black gray and white with a blue tint.

April - November.
Length 7.5 - 13 mm

The larvae can be found in the manure.

The larvae live in manure and decaying organic matter.

April - October