THE INSECT FAUNA OF THE GENUS CRATAEGUS 1067 



testacea Kirby, Dichelonycha 



The beetles of Dichelonycha testacea were found on Crataegus tomentosa 

 foliage on May 29 and July 1. They cut irregular patches from the 

 edge of the leaf. The species is not common. 



Chrysomelidae 



borealis Shev., Dibolia 



The green flea beetles of the species Dibolia borealis are 2J millimeters 

 long. They feed on native hawthorn foliage in May, as soon as it is 

 expanded. They hibernate beneath bark scales on the trunk and the 

 branches, and when warmed in the hand in February they very soon 

 become active. 



carinata Germ., Haltica 



The metallic violet or green flea beetles of the spscies Haltica carinata 

 are 4 millimeters long. They feed on foliage of native hawthorns in 

 June. They are not common. 



cucumeris Harris, Epitrix 



Tiny shining bluish beetles less than 2 millimeters long, of the species 

 Epitrix cucumeris, were found feeding on Crataegus punctata foliage in 

 June. The species is not common. 



helxines Linn., Crepidodera 



The shining greenish flea beetles of the species Crepidodera helxines are 

 3 millimeters long. They feed on the foliage of native hawthorns and are 

 frequently so numerous as to cause considerable injury. They are found 

 feeding in May, June, July, and August, but are most abundant in 

 late May and in June. The beetles hibernate under bark scales on the 

 trunk and the larger branches, where many of them die from the attack 

 of a white fungous growth before spring. 



marginalis 111., Systena 



Yellowish brown, slender flea beetles 4 millimeters long, of the species 

 Systena marginalis, were found in August and early September eating 

 holes in leaves of native hawthorns. The species is fairly common. 



villosula Melsh., Xanthonia 



The stout brownish or black beetles of the species Xanthonia villosula 

 are 4 millimeters long. They were found feeding on the leaves of 

 Crataegus punctata from late June to early August. Occasionally they are 

 so abundant as to completely riddle the foliage of a tree with the holes 

 they cut in feeding (Wellhouse, 1919). Feeding punctures are shown in 

 figure 110, on the following page. 



