RES Handbook Vol 1 Part 11. Thysanoptera

The term 'British species' may be interpreted in different ways. In the Formicidae 'native' species and a few firmly established or regular immigrants are considered under this title; however, in groups such as the Psocoptera all species which have been collected in the British Isles are regarded as 'British species'. The latter interpretation has been adopted in the present handbook. Many Thysanoptera are transported by air currents and it is not always easy to differentiate between these natural immigrant species and those species which have been accidentally introduced by man.