﻿Homoptera of Cranhcrry Lake Region 33 



(var. fiimipennis) 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), and, 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 mav be counted injurious. 

 State Forest Camp, Julv 3, 1920. Grasse^ River, July 22, 1920. 

 Wanakena, Aug. 12, 1920. 



Macropsis canadensis (Van Duzee) (Plate I, Fig. d). 



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, July 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 claval 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, Julv, 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 wdth 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, Fig. 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, 1920, seem to agree structurally 

 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 Duzee (Plate I, Figs. /.: and /). 



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 fitchi. Barber Point, July 17, 1920. 

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