Tue 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 24 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 species 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. 
marginals Ill., 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. Oce asionally they are 
so abundant as to completely riddle the foliage of a tree w ith the holes 
they cut in feeding (Wellhouse, 1919). Feeding punctures are shown in 
figure 110, on the following page. 
