About bees

Classification of bees

After variety of flowers the most bees are polilectice which means they gather pollen from many flowers. Some bees gather pollen from certain flowers while other bees gather pollen from flowers of certain colors.

After social life:

Solitary — The most of Apoidea insects are solitary, which means they don't live in colonies; every female makes her own hive.
Communal and semi social — Some bees are communal. They are like solitary bees, but some females belong to same generation use one hive, eachone making her own little rooms in order to shelter eggs and larvae. Some bee species are semi social - they live in small colonies of 2-7 some generation bees and one of them is the queen.
Social — Real social bees live in large colonies where females survive two generations: mothers (queens), doughters (workers) and males (drones) which don't play any role in colony but to breed with queens.

After feeding mode:

Non-parasite
Parasite — Parasite bees are those bees which don't feed their own larvae and don't build their own hive, but use otehr bees species' hive and reserves to supply young parasite bees.
Clepto parasite bees invade solitary bees' hives, hide their eggs in the hive before host bees do that and then close the rooms.
Social parasites represent bees that kill resident queen, lay eggs in the host rooms and then force host workers to feed young bees parasites.

Further information ...here

The source: http://wikipedia.org.