Colletes hederae FAQ's
>>What is an Ivy Bee?
The Ivy Bee is a species of mining bee that was first recorded in Britain in 2001. As the name suggests, it forages almost exclusively at flowers of Ivy, and flies only from September to mid-November (ie during the flowering period of Ivy).
>> What are they doing in my lawn?
These bees are nesting in the lawn. The nesting aggregations are often dense and the number of nests can get as large as 10's of thousands. They prefer loose soil.