II. The genus dreyfusia (order hemiptera, family chermesidæ) in britain, and its relation to the siver fir

Abstract

The following paper embodies the results of an investigation, carried on during the past two years under the Department of Scientific and Industrial Research, at the Royal Botanic Gardens, Kew, on the biology and host relationships of the silver fir Chermes , which belong to the genus Dreyfusia . The Chermesidæ , a family of the sub-order Aphidoidea ( Hemiptera-Homoptera ), commonly known as plant lice, attack a large and varied number of plants, piercing their tissues in order to obtain their food.