These are the most evolutionarily advanced flies with mostly maggot like larva, they are generally short and stocky and covered in short hairs.
These are remarkable ugly little flies (between 0.5mm and 6mm long) renowned for the fact that some species of them i.e. Conicera tibialis, can live for a year or more and produce numerous generations inside fully interred coffins, they feed on the dead bodies within. Harold Oldroyd mentions a reliable report in his book "The Ecology of Flies" of a European in Burma passing larva, pupa and adults of an unidentified Phorid suggesting that he had a colony living in his alimentary canal.
Within the family Phoridae is the tribe Termitoxeniinae which live in Termite nests and are amazing in how short their larval life is. The first stage instars moult immediately after hatching, the second stage does not eat and moults shortly after this and the third stage has been completely suppressed, thus the whole larval life lasts less than one hour and in some species only a few minutes.
Hover-flies are some of the most attractive and noticeable flies around, they are also as their name implies incredibly good at flying and hovering. Many Hover-flies are clever mimics of Bees and Wasps (Hymenoptera) though they themselves cannot bite or sting. Volucella bombylans which exists in two forms, a yellow tailed form which looks like Bombus terrestris and a red tailed form which looks like Bombus lapidarius is a fine example. As larva, Hover-flies feed on a great variety of substances, from cow dung (Rhingia campestris), muddy puddles and ditches ( Eristalis tenax the Drone Fly), to living plant material (Merodon equestris the Bulb Fly) and living aphids (Episyrphus balteatus the Marmalade Hover-fly and Syrphus ribesii a common black and yellow wasp mimic). In fact so many Hover-fly larva eat aphids that, like the lady-beetles they are well known as a gardeners friend. Not only are Hover-flies useful because they eat aphids but they are also the second most important group of insect pollinators, after the Bees and Wasps.
Their are a large number flies which are commonly associated with dung, in the north temperate areas (that's us in England as well as most of Europe and a fair portion of North America) this means mostly cow, horse, pig and sheep dung. The Sepsidae and Borboridae feed on the dung as both larvae and adults and various species from both families will make up most of the small black flies which fly up if you disturb a fresh cow pat. The Scatophagidae are the Dung-flies (i.e. the yellow and grey hairy flies you can find all over grassy fields). The Common Yellow Dung Fly Scathophaga stercoraria is a typical example of this family and though their larva feed on the dung the adults are predatory and feed on other flies which have come to the dung to feed.
These are the small flies with light red eyes that you find in the kitchen in Summer when ever some fruit has become over ripe, once you get some in your house they tend to fall into your drinks especially beer, wines, cordials and fruit juices. The genus Drosophila contains more than 1 000 species some of which have a two week life cycle and are commonly found in Universities and Colleges around the world where they are used for experiments in the study of genetics and in Pet Shops where they are sold as food for baby Spiders and Preying Mantids.
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The Muscidae are a large family of flies typified by three species. The Common House-fly Musca domestica which has two large orange spots on its abdomen, and whose larva live in rotting vegetable matter and dung. The Lesser House-fly Fannia canicularis which has four small orange spots on its abdomen and tends to fly around and around in circles in your living room. And the Stable-fly or Biting House-fly Stomoxys calcitrans. It is worth noting that a pair of entomologists called Yao and Yuan after studying 378 046 House-flies estimated that in a residential area each House-fly carries 1 941 000 bacteria, so don't let them get at your food. The Muscidae also includes some of the Green Bottles though others are part of the Calliphoridae and it can be difficult for an amateur to tell these otherwise quite attractive flies apart.
The larva of these flies all live in, or feed on carrion (recently dead animals) but only when it contains a high degree of moisture. Blow-Flies got their name from the fact that meat that they had laid their eggs into was called blown as in blown up. Blow-flies like the Blue Bottle Calliphora vomitoria are highly attracted to thawed out or cooked meats and can be quite a nuisance in warmer counties than the UK. The Green Bottles Lucilia sp., are apparently attracted to a different set of odours than the Blow- flies and this is why they are often common outside but seldomly come indoors. The largest members of this group are the marbled-grey Flesh-flies, like Sarcophaga carnaria. These are again often common outside but seldom come into a house, and though they too breed in carrion they give birth to live young larva rather than laying eggs.
Aside from feeding on carrion there are a number of flies which have taken to feeding on living flesh. Some of these are related to the common Green Bottle i.e. Lucilia sericata and Lucilia cuprina which lay their eggs in the damp ammoniated wool around the sheep's anus. The larva, which start off eating the sheep's faeces, soon take to eating the sheep's flesh instead. These two flies are a serious pest of sheep from Scotland to Australia. These, and others like them, attack a wide variety of animals, particularly in the tropics, and are known as Bots or Bot-Flies. Even more painful are the Warbles or Warble-Flies whose larva burrow beneath the skin, leaving only their anal spiracles exposed to the air. The human bot-fly is Dermatobia hominis of South Africa whose females lay their eggs on a mosquito or some other sort of biting (piercing) fly which carries the egg to its human host In tropical countries most animals are attacked by some sort of warble, even elephants and rhinos have their hides pitted with the pock marks left behind by the larva as they burrow out of the skin before falling to the ground to pupate. Adult Warble-flies are large and hairy and often look like Bumblebees.
The Hippoboscidae are all parasites of mammals and birds, the adults all
feed on fresh blood and after their initial dispersal seldom leave their
host or its nest/lair though most of them are winged and can fly quite
well. The larva live their entire life inside the adult female who 'lays'
pupa which in some bird parasites lies in the nest over winter, hatching
in time to crawl onto the returning adults as they reoccupy the nest. The
adults are nearly all flattened ugly looking things with strong clasping
legs and a crab like gait, i.e. the European Forest Fly Hippobosca equina.
The Streblidae are much the same as the Hippoboscidae except that they only live on bats, and then only where the winter temperature remains above 10C. Most them stick their mature larva onto the walls of the caves they share with their hosts where they pupate rather than dropping them to the ground.
The Nycteribiidae are the worlds ugliest flies and look more like spiders. Like the Streblidae they are confined to bats as hosts and they stick their larva to the surrounds, however they are completely wingless and are totally dependant on their hosts for transport as well as for food