222 A MAisruAL or dangerous insects. 



Rhabdophaga spp. 

 (Willow Gall Midge. Itonididse [Cecidomyiidse]; Diptera.) 



Species: R. aielsonii Kieffer; Denmark; willow. R. saliciperda Dufour; Europe; 

 willow, PopiUas alba. R. salicis Schrk.; Europe; Salix purpurea. 



Injury: Bore in wood and form gall-like formations. 



Deso'lption and biology: R. nielsonii with head and thorax beneath yellowish red, 



thorax dark brown above; abdomen red; length 3 mm. 



SoRAUER, P. Handbuch der Pfianzenkrankheiten, 3d ed., 1913, vol. 3, pp. 456, 457, 



fig. 277. 



B. OTHER IMPORTANT WILLOW INSECTS. 



ACARINA. 

 Eriophyidse. 



Eriophyes tetanothrii Nsdepa, blister mite; England; attacks leaves of Salix caprea. 



HEMIPTERA. 

 Aphididae. 



Lachnus viminalis Fonsc, plant louse; Germany; attacks shoots of Salix viminalis. 



Coccldae. 



Armored — 



Aspidiotus ( Tarqionia) distincta Leonardl; Europe. 



Chionaspis salicis Linnseus; Europe. 

 Unarmored— 



Lecanium ciliatum Douglas; Europe. 



Lecanium coryli Linnaeus; Europe. 



Phejiacoccus aceris Signoret; Europe. 

 • Pulvinaria behUae Linnseus; Europe. 



COLEOPTERA. 

 Anobiidse. 



Ptilinus fuscus Geoffroy; Europe; bores In dead wood of standing living trees. 

 Ptilinus pectinicornis Linnaeus; Europe; bores in wood. 



Buprestidse. 



Agrilus sexguttatus Brahm., Europe; bores in bark. 

 Poecilonota variolosa Paykull; Eiu-ope; bores in bark. 



Scarabaeidse. 



Amphimallon solstitialis Linnaeus; Europe; larvae attack roots of shoots. 



Melolontha hippocastani Fabricius and M. melolontha Linnaeus; Europe; larvae attack toots of seed- 

 lings. 



Cerambycidse. 



Molesthes sarta Solsky; India; bores in trunks of Salix alba and S. babylonica. 



Aromia moschata Liimaeus; Germany; bores in stems and old cuttings. 



Lamia textor Linnaeus; Europe; bores in larger cuttings and shoots. 



Oberea oculata Linnaeus; Europe; bores in pith of twigs and stems. 



Phymatodes lividus Rossi; Germany; particularly injurious to baskets; also, attacks felled trees and 

 lumber. 



Saperda carcharias Linnaeus, 5|cS. populnea Linnaeus; Europe; bore in bark and wood. The latter spe- 

 cies occurs on the Pacific coast of the United States. 



Chrysomelidse. 



Haltica quercetorum Foudr.; Europe; leaf beetle (see Oak); H. ampelophaga Guerin; Europe, Africa 



(see Grape). 

 yfelasoma populi Linnseus; India; defoliator on Salix elegans and S. babylonica. 



CuTCullonidse. 



Dorytomus aifinis Paykull, D. agnathus Boheman, D. dorsalis Herbst, D. maculatiis Marsham, D. 



majalis Paykull; Europe; the eggs are laid in the buds in the fall, and the larvae develop in the 



flowers in the spring. 

 Orchestcs decoratus Germar; Europe; mines the leaves of Salix triandra, S. viridis, S. fragilis, and S. 



purpurea. 

 Orchestes populi Fabricius; Europe; mines the leaves of Salix viminalis, and S. triandra. 

 ^ Cryptorhynchus lapathi Linngeus; Europe, eastern United States; breeds in the stems and twigs. 



