They are usually regarded as forming a single family - the Apidae - but there is very great diversity in structural details, and Ashmead divides them into fourteen families.
At present it comprises the single family Nebaliidae.
Homes must be single-family homes or two to four unit properties, or manufactured homes built after 1976.
Hence 'the insects may more conveniently be regarded as constituting the single family Phryganeidae.
All the other members of the group may be regarded as forming a single family - the Proctotrypidae, including an immense number of small parasitic Hymenoptera, not a few of which are wingless.