This year seems to be a bumper year for Melecta albafrons which may mean it was a good year for Anthophora plumipes last year .This cleptoparasite / host cycle will repeat its self most years
A cuckoo bee of the Hairy-footed Flower Bee, Anthophora plumipes. The female M. albifrons goes into an Anthophora burrow and lays its egg with the pollen food supply gathered by Anthophora. When the Melecta albifrons egg hatches the larva feeds up on the food supply intended for the Anthophora larva, pupates and emerges next year instead of the host.
Melecta albafrons top photo , Anthophora plumipes bottom photo.