Arid Bees are part of the Barren Branch of bees in the Extra Bees add-on of the Forestry mod. They are obtained by cross-breeding Meadows and Modest.
A very special trait that the Barren Branch of bees have is that they don't require flowers to work. This trait can be exceptionally useful to put on bees used in massive bee farms, as without the need for flowers, the more space available for these farms.
Arid Bees produce barren combs. Barren combs give beeswax and a 50% chance of honey drops when processed in a centrifuge.