PLATE VIII. Aphididae. 



1. Macrosiphum rudbeckiae Fitch, x i. 



2. Macrosiphum solanifolii Ashmead, — potato aphid, x i. 



3. Eriosoma lanigerum Hausman, — woolly apple aphid, x i. 



4. Prociphilus tessellata Fitch, x i. 



5. Chermes pinicorticis Fitch, — pine bark aphid, x i. 



6. Chermes strobilobius Kaltenbach, — woolly larch aphid, x i. 



Photographs by B. H. Walden. 



