HEMIPTERA 1093 



coccinea Forst., Graphocephala Fam. Cicadellidae 



(See page 1061.) 



communis Knight, Lygus Fam. Miridae 



(See page 1054.) 



corni Bouch, Lecanium (European fruit lecanium) Fam. Coccidae 



Hosts Crataegus, Malus, Prunus, and other species. 



Injury May suck so much sap from branches as to kill them, but commoner injury is 

 due to growth of sooty fungus over sticky sacretion which the insects drop on foliage, 

 fruit, and branches. 



Distribution Europe, North America. 

 References Sorauer, P. Handbuch der Pflanzenkrankheiten 3 : 695. 1913. 



Slingerland, M. V., and Crosby, C. R. Manual of fruit insects, p. 261. 

 1914. 



corrugatans Sir., Pemphigus (Woolly thorn aphis) Fam. Aphididae 



Hosts Crataegus, Amelanchier, Pyrus, Cydonia. 



Injury Distorts leaves into a rolled curl. 



Distribution North America. 



References Patch, E. M. Maine Agr. Exp. Sta. Bui. 233. 1914. 



Quaintance, A. L., and Baker, A. C. U. S. Agr. Dept. Farmers' bul. 

 804:19. 1917. 



coryli Linn., Lecanium Fam. Coccidae 



Synonyms Eulecanium pyri Schr., Lecanium capreae Linn. 

 Hosts Malus, Crataegus, Pyrus, and other species. 

 Injury Sucks sap from bark, not commonly injurious. 

 Distribution Europe, North America. 



References Theobald, F. V. Insect pests of fruits, p. 175. 1909. 

 Lindinger, L. Die Schildlause, p. 216. 1912. 



costalis Flor., Psylla Fam. Psyllidae 



Hosts Malus, Crataegus, Sorbus, Quercus. 



Distribution Europe. 



Refere ce Harrison, J. W. H. Naturalist (London), no. 707, p. 400. 1915. 



crataegarium Walk., Macrosiphum Fam. Aphididae 



Host Crataegus oxyacaniha. 



Distribution Enlgand. 



References Walker, F. Ann. mag. nat. hist. 6: 46. 1850. 



Theobald, F. V. Journ. econ. biol. 8: 142. 1913. 



crataegi Kalt., Aphis Fam. Aphididae 



Synonyms Aphis pyri Boyer, A, crataegi Koch, A. ranunculi Kalt. 



Hosts Crataegus oxyaccintha, C. azarolus, Malus, Ranunculus. 



Injury Curls, discolors, and blisters leaves on terminal shoots. 



Distribution Europe. 



References Dobrovliansky, V. V. Biology of aphids of tree and bush fruits (Kiev). 



1913. 



Van der Goot, P. Hollandischen Blattlause, p. 174. 1915. 

 Theobald, F. V. Entomologist 48 : 259. 1915. 



crataegi Fitch, Glossonotus (Hawthorn tree hopper) Fam. Membracidae 



Hosts Crataegus, Malus, Cydonia. 



Distribution North America. 



References Fitch, A. Third annual report on noxious insects of New York, p. 334. 



1856. 

 Funkhouser, W. D. Cornell Univ. Agr. Exp. Sta. Memoir 11:248. 1917. 



