1092 HEMIPTERA 



bakeri Cowen, Aphis (Clover aphid) : . . .Fam. Aphididae 



Hosts Malus, Crataegus, clover. 



Injury Sucks juice from opening buds of fruit trees. 



Distribution North America. 



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



804:15. 1917. 

 Patch, E. M. Maine Agr. Exp. Sta. Bul. 270:49. 1918. .- 



bellula Gibson, Corythucha Fam. Tingitidae 



Hosts Crataegus neofluvialis, C. punctata, C. albicans, Alnus incana, Ribes oxyacan- 



thoides. 

 Injury Bot'i young and adult bugs suck juice from leaves, causing them to turn brown 



and drop off. . 



Distribution Northeastern United States, Canada. 

 References Gibson, E. H. Amer. Ent. Soc. Trans. 44:93. 1918. 



Wellhouse, W: H. Journ. econ. ent. 12:441. 1919. 

 (Plates LXXII and LXXIII, pages 1057 and 1059.) 



betulae Bar., Epidiaspis (European pear scale) Fam. Coccidae 



Synonyms Epidiaspis leperi Sign., E. piricola De Geer, Diaspis piri Colv. 



Hosts Pyrus, Malus, Prunus, Crataegus, and other species. 



Injury Very injurious to young twigs and branches of apple and pear in southern 



Europe, where the bark becomes incrusted. 

 Distribution South and middle Europe, United States. 

 References Lindinger, L. Die Schildlause, p. 213. 1912. 



Essig, E. 0. Injurious and beneficial insects of California, p. 172. 1915. 



bituberculatum Targ., Lecanium Fam. Coccidae 



Hosts Crataegus oxyacantha, Malus, Pyrus. 



Injury Sucks sap from bark, sometimes killing young trees. 



Distribution Europe, North America. 



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



Dietz, H. F., and Morrison, H. Indiana State Ent. Ann. rept. 8:254. 

 1916. 



brevis Sand., Aphis (Long-beaked clover aphid) Fam. Aphididae 



Hosts Crataegus, Cydonia, Pyrus, clovers, sweet pea. 



Injury Curls and turns purplish the terminal leaves of Crataegus shoots during June. 



Distribution United States. 



Reference Patch, E. M. Journ. agr. res. 3:431. 1915. 



brunnea Gibson, Corythucha Fam. Tingitidae 



Host Crataegus. 



Injury Sucks juice from foliage. 



Distribution Southern United States. 



Reference Gibson, E. H. Amer. Ent. Soc. Trans. 44:93. 1918. 



bubalis Fabr., Ceresa (Buffalo tree hopper) Fam. Membracidne 



Hosts Malus, Crataegus, and other species. 



Injury Adult makes incisions, in branches 'for oviposition. Incisions are slow to 



heal and allow entrance of borers and fungi. 

 Distribution North America. 

 References Packard, A. S. Fifth rept. U. S. Ent. Comm., p. 535. 1890. 



Hodgkiss, H. E. New York (Geneva) Agr. Exp. Sta. Tech. bul. 17:92. 

 1910. 



clitellarius Say, Thamnotettix Fam. Cicadellidae 



(See page 1061.) 



