1094 HEMIPTERA 



crataegi VanD., Idiocerus Fam. Cicadellidae 



Host Crataegus. 



Injury Adults and young suck juice from foliage. 



Distribution North America. 



Reference Van Duzee, E. P. Can. ent. 22 : 110. 1890. 



crataegi Monell, Macrosiphum Fam. Aphididae 



Hosts Crataegus punctate, C. coccinea, C. oxyacantha. 



Injury Sucks juice from lower side of leaves and from tender twigs. Leaves curl 



downward and in severe infestations trees may be defoliated. 

 Distribution North America. 



Reference Patch, E. M. Maine Agr. Exp. Sta. Bui. 233:255. 1914. 

 (Fig. 108, page 1063.) 



crataegi Tullgr., Prociphilus Fam. Aphididae 



Hosts Crataegus oxyacantha, Malus. 



Injury Curls and discolors leaves and sometimes injures blossoms. 



Distribution Europe. 



Reference Van der Goot, P. Hollandischen Blattlause, p. 450. 1915. 



crataegi Schr., Psylla Fam. Psyllidae 



Synonym Chermes quercus Thorns. 



Hosts Cratiegus oxyacantha, Quercus sp. 



Injury Causes small red blisters to form on upper side of leaves. 



Distribution Europe. 



Reference Aulmann, G. Psyllidarum catalogus, p. 13. 1913. 



crataegi Dgl., Typhlocyba Fam. Cicadellidae 



Hosts Crataegus oxyacantha, apple (?). 



Injury Nymphs and adults suck juice from foliage, but commonly they are not 



numerous enough to cause much injury. 

 Distribution Europe. 

 References Douglas, J. W. Ent. mo. mag. 12:203. 1876. 



Melichar, L. Cicadinen von Mittel-Europe, p. 348. 1896. 



crataegiella Theobald, Aphis Fam. Aphididae 



Synonym Aphis crataegi Buck. 



Host Crataegus oxyacantha. 



Injury Curls and discolors leaves of terminal shoots, which turn reddish brown. 



Distribution Europe. 



References Buckton, G. B. Monograph of British aphides, 2:35. 1879. 



Theobald, F. V. List of Aphididae of Hastings District, p. 9. 1912. 



crataegifoliae Fitch, Aphis Fam. Aphididae 



Hosts Crataegus punctata, C. coccinea, C. oxyacantha, C. tomentosa, Cydonia, legumes. 

 Injury Curls and discolors leaves and young shoots, turning them purplish. 

 Distribution North America. 



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

 804:18. 1917. 



crataegus-coccinea Rafin., Aphis Fam. Aphididae 



Host Crataegus coccinea. 

 Distribution North America. 



References Rafinesque, C. S. Amer. mo. mag. and crit. rev. 3 : 16. 1818. 

 Patch, E. M. Maine Agr. Exp. Sta. Bul. 270:48. 1918. 



curtisii Fb., Euscelis Fam. Cicadellidae 



(See page 1161.) 



