32 New York State College of Forestry 



living on other food plants so that its economic importance is re- 

 stricted to the value of the willow. State Forest Camp, July 2. 

 Grasse Kiver, July 22, 1920. Wanakena, Aug. 12, 1920. ' 



Idiocerus suturalis Fitch (Plate I, Figs, a and 5). 



Forest Camp, July 2, 1920. Grasse River, July 22, 1920. 

 Wanakena, July 29 and Aug. 12, 1920. 



Idiocerus alternatus Fitch. 



Common on poplars and willows and one of the more abundant 

 forms of the genus. This occurs over wide territory and in a num- 

 ber of more or less distinct varieties. State Forest Camp, July 5, 

 1920. Grasse River, July 22, 1920. 



Idiocerus subnitens Sanders and Delong. 



Numerous specimens, taken at Barber Point on willow, 1917, 

 1919 and 1920. A few specimens were also collected on poplar, but 

 Salix seems to be the preferred food plant. The insect was de- 

 scribed from Wisconsin. 



Idiocerus lachrymalis Fitch. 



The nymphs of this species were quite abundant on aspen early 

 in July. The adults appear later in the season so that the species 

 may be counted fairly common and as it is most abundant upon 

 the aspen its injury may be considered as limited to the latter tree. 

 The egg punctures in the twigs and smaller branches occasion large 

 swellings and distortions and no doubt weaken the limbs so that 

 they are easily broken. State Forest Camp, July 2, 1920. Grasse 

 , River, July 22, 1920. 



Idiocerus provancheri Van Duzee. 



AVhile this species has been taken on plants away from bogs in 

 other regions, all of our specimens here have been from bog plants 

 and this seems to be its restricted habitat, the special plants on 

 which it occurs being Viburnum or Cassandra. This species is not 

 abundant but a number of specimens have been taken at different 

 points. State Forest Camp, July 5, 1920. Grasse River, July 22, 

 1920. Plains, Aug. 3, 1920. 



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. basalts), one in which 

 the deep marking of the wings is limited to the base and the other 



