PLATE XV. CocciDAE, Scale Insects. 



1. Diaspis echinocacti Bouche var. cacti Comstock, x i. 



2. Hemichionaspis aspidistrae Signoret, x about 3. 



3. Leucaspis japonica Cockerell, x i. 



4. Aspidiotus perniciosus Comstock, — San Jose scale, x i. 



5. Aspidiotus hederae Vallot, — white or oleander scale, x 2. 



6. Chrysomphalus aonidum Linnaeus, — circular or fig scale, x I, 



7. Lepidosaphes nezvsteadi Sulc, x 4. 



8. Lepidosaphes ulmi Linnaeus, — oyster-shell scale, x i. 



9. Ischnaspis longirostris Signoret, — thread scale, x 2. 



Photographs by B. H. Walden. 



