Tteterophra of (U-aiihernj Ldke jti€g!o)i G.") 



Fig. 26. — Eggs of Cori/tluirha chyiuis. Photo by Drake. 



winter in the mature state. Salicis Osborn and Drake and cana- 

 densis Parshley are synonjans of this species. It is very variable 

 in size and somewhat in color. 



Corythucha elegans Drake (Fig. 25, a and h ; Fig. 26, eggs). 



Taken on ISalix spp. at Barber Point, Wanakena, Plains and 

 Conifer. This species and the following, C. pallipes Parshley, are 

 by far the most abundant species of Heteroptera living in the 

 vicinity of Cranberry Lake. It is not uncommon to find the leaves 

 of badly infested trees greatly discolored and almost entirely 

 destroyed by their feeding punctures. Elegans also hibernates 

 in the adult state. The nymphal stages are represented by five 

 instars and there are two generations a year at Barber Point. The 

 eggs are laid in irregular rows on the ventral side of the leaves 

 along either or both sides of the principal veins. The nymphs 

 feed in clusters during the early stages. Occasionally the species 

 breeds on poplars, Popiihis tremuloides Michx. and Populus 

 grandidentata Michx. A few seedings of the large -tooth poplar 

 were very badly infested during the past summer, 1920, at Barber 

 Point, but willow seems to be the preferred food-plant. Antho- 

 coris horeaUs and the larvae of a lace-wing fly. Clirysopa sp. 

 were observed preying upon this insect in the field. 



Corythucha pallipes Parshley (Plate IV, Fig. 44). 



This insect is usually found in immense number on yellow 

 birch in the vicinity of Cranberry Lake. It also breeds on white 

 birch, beech, ironwood and occasionally on mountain ash and hard 

 3 ' ■ 



