T1NGITIDAE Corythucha pergandei lleidemann.
Common on alder, taken at Barber Point, Plains and Wanakena during the entire summer. This species spends the winter in the adult state; there are two generations a year in the Adirondaeks.
Corythucha bellula Gibson.
Common on alder, but not taken in the same association with he id emouni. Barber Point and Wanakena, June, July and August, 1917, 1919 and 1920.
Corythucha marmorata Not common, swept from weeds at Barber Point, July, 1920.
Corythucha mollicula Osborn and Drake (Fig. 25, c and d).
Common on various species of willow, but not as abundant as ete.yam Drake. Barber Point, Plains, Conifer and Wanakena dur ing the entire summer. This insect also hibernates during the winter in the mature state. tia/icis Osborn and Drake and cane densis Parshley are synonyms of this species. it is very variable in size and somewhat in color.
Corythucha elegans Drake (Fig. 25, a and b; Pig. 26, eggs).
Taken on Satix 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, Popalus tremuloides Michx. and Popalus grandidentala 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. A Who conis borealis and the larvae of a lace-wing fly. Chrysapa 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. Tt also breeds on white bireh, beech, ironwood and occasionally on mountain ash and hard and soft maple. C. hclider Drake and C. cyria Parshley are synonyms of Ibis species. The life history of pullipeg is discussed in another paper in this Galeatus peckhami Ashmead (Plate V).*' About 200 specimens, taken upon aster, Aster marrophyllus, and boneset, Eupatorium sp. at Barber Point (summit of Cratae gus during the last week of July and August, 1920, by 1)1.. Osborn and the writer. The life history of this insect is also dis cussed in another paper herein.
Melanorhopala clavata Stal.
Several specimens, taken near a small stream on tall weeds at the Plains during the latter part of August, 1920.