Macropsis viridis (Fitch).
This is perhaps the most abundant of the genus and is found on almost every willow, that is, during the time they are in season, July and August. State Forest Camp, July, 1920. Grasse River, July 22, 1920.
Macropsis sp.
Cranberry Lake, 1920.
Macropsis basalis (Van Duzee) (Plate I, Figs. e, f and g).
This occurs in two distinct varieties (var. bosons), one in which the deep marking of the wings is limited to the base and the other (var. funtipennis) there are either two distinct bars or the entire wing is dark smoky or brown. The two forms occur on the same trees (willows and aspen), anfi, in so far as could be noted, the varied specimens develop from identical larvae. Upon further rearing of the individual it would be desirable to confirm this point. They are so plentiful on aspen that they may be counted injurious. State Forest Camp, July 3, 1920. Grasse River, July 22, 1920. Wanakena, Aug. 12, 1920.
Macropsis canadensis (Van Duzee) (Plate I, Fig. 4).
Taken on the willow, especially in the lower ground along region of lake or brook, but, less abundant than some of the other species. Cranberry Lake and Barber Point, Judy 13, 1920.
Oncopsis variabilis (Fitch) (Plate I, Figs. i and j).
This is an extremely variable species and occurs in several dif ferent forms, the most abundant one being bright yellow with black strips along the elaval suture. Its common food plant ap pears to be yellow birch, also white birch, and it has been taken in dense woods as well as along the margins of thickets of the forest. State Forest Camp, Barbers Point, July, 1920. Grasse River, July 22, 1920. Wanakena, July 29, 1920. Plains, Aug. 3, 1920.
Oncopsis sobrius (Walker).
This species is evidently common on the yellow birch and while this may not be its only food plant, it would seem to be the common one. But the species is less abundant than in 'Maine and does not rank with one or two of the other species of the genus as a forest pest if we may judge by its occurrence during the present season. Cranberry Lake, June 30, 1919.
Oncopsis cognatus (Van Duzee) (Plate I, Fib. h).
• Specimens placed here were collected at Wanakena, Aug. 1-7, 1917. A number of other specimens collected at Barber Point from yellow birch, July 13-24, 1.920, seem to agree with this form but are quite uniformly cinnamon brown in color. They may constitute a variety or possibly a distinct. species but it is desirable to have more biological data before multiplying species in this extremely variable genus.
Oncopsis fitchi Van Drizee (Plate I, Figs. and 1).
Very abundant, on a variety of plant-hosts, especially birch, and apparently the most important species of the genus. Its attacks result in a drain upon the plants and egg punctures of this species are noted so abundantly on some trees as to become injurious. State Forest Camp, July 2, 1920.
Oncopsis pruni (Provancher).
Very few specimens have been referred to this species and these appear closely related to fitch i. Barber Point, July 17, 1920.
Oncopsis minor (Fitch).
Apparently one of the common forms on yellow birch but not easily separated from fitchi. Barber Point, July 9, 10, 13 and Aug. 2, 1920.
Oncopsis nigrinasi (Fitch).
State Forest Camp, Barber Point, July 5, 1920 Oncometopia lateralis (Pabrieius).
This species has a very wide range, occurring from Canada to the southern IT. S. and infesting a great variety of plants. it lives in a great variety of habitats. At Cranberry Lake it was taken in the Plains region of the low ground along streams and on the hilt tops, but occurred in greatest abundance at the " French Camp," Wanakena (Aug. 12, nymphs and adults were taken in large num bers). These were secured by sweeping grass and apparently the species was feeding in this location although possibly they may have developed on herbaceous plants in the immediate vicinity. Cranberry Lake, Sept. 15, 16, 1917 ; (nymphs and adults) July 28, 1920. Nymph-Plains, Aug. 3, 1920, and one adult Aug. 12, 1920. Grasse River, July 22, 1920. Wanakena, Aug. 1-7, 1917.