Most Blowfly larvae usually live in carrion or other decaying organic matter. 

In the Netherlands, the following species are: Bellardia obsoleta, Bellardia pandia, Bellardia vespillo, Bellardia viarum, Bellardia vulgaris. The species are almost indistinguishable. 
Only the abdomen and scutellum are shiny green. The thorax is grey with light grey stripes at the head.
The larvae are parasites of earthworms. The adult flies feed on nectar and pollen. The females are viviparous and deposit the larvae on earthworms.
  

Everyone knows the bluebottle. It's a beautiful fly (I think) because of metallic blue-gray coloration. The Calliphora vicina  has  bright orange cheeks. That's different from the Calliphora vomitoria. 
This bottlefly lays its white eggs on a variety of  bait.  Length 8-12 mm. March - November. 
Calliphora vicina are found throughout Europe and the U.S.A. Photos 27-3-2012, 11-4-2012. 
 

The abdomen is blue green with a metallic sheen. The light yellow with orange face is very striking. The eggs are laid on dead animals. Length 8 - 15 mm. Europe, Asia, North America. Photos 27-5-2014.  German: Totenfliege.
    

The name blow-fly comes from an older English term for meat that had eggs laid on it. Flies in this family are often metallic in appearance.
The Greenbottle (Lucilia caesar) is common, but there are many very similar species. Greenbottles are found everywhere, on carrion, dung, but also on flowers.  The larvae feed on carrion and adults visit flowers for nectar.
It has a beautiful metallic bluish green colour. This is the most widespread and common species. As always there are similar species. Photos 5-5-2010, 4-10-2012, 4-7-2012,  9-10-2012.

Lucilias 8-8-2009.
       

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Until recently, Melanomya was counted to the family Rhinophoridae. A very small fly. About 3-4 mm. On these photos it is sitting on a Lady's mantle. Photos 29-5-2010, male

Female 24-7-2017. 
  

In these pictures the hairs are less visible.  Species in the Netherlands are: Pollenia amentaria, Pollenia angustigena, Pollenia atramentaria, Pollenia griseotomentosa, Pollenia labialis, Pollenia pediculata, Pollenia rudis, Pollenia vagabunda, Pollenia viatica.  Photos March 2012.
    

The female has shiny green abdomen. The thorax is shiny green gray with stripes. The male is shiny blue.
The larvae of these Protocalliphora live in nests of birds and are parasites of young birds. Photos 30-6-2012.

  Male 12-8-2014.
  

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The fly, like a gadfly horizontal bands on the eyes. On the abdomen, it  has two bands.
Apparently it is parasitic on grasshoppers. In Africa on the harmful African grasshoppers. The larvae eat the eggs.
Size: about 9 mm. Europe, Africa, Middle East, North America. (Originally from Africa and the Mediterranean region) Photos 3-7-2011, 11-8-2013.
   

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