RES Handbook Vol 5 Part 9. Coleoptera

THE families herein dealt with are not in themselves a complete family series but form part of the Heteromera (Cucujoidea, section ii of Crowson) , an extremely large group of families distributed throughout the world, though poorly represented in Great Britain. They are very diverse in form, habits and size; the family series is very complex and the affinities of the individual families are in many instances by no means clear.