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Xru- York S^fafr CoJhgr of Forestry 



Family APHIDIDAE 



This larjre and exceedingly important family has been given less 

 attention than some of the other families, partly because the most 

 important species have received extended investigation, partly due 

 to the effort to clean up details of life history for some of the 

 destructive but little known species in other families. No attempt 

 has been made to collect the species occurring in the Cranberry 

 Lake region. 



The group is of remarkable interest on account of its unusual 

 mode of reproduction, its enormous rate of multiplication and the 

 many puzzling phases of its attacks on different hosts, seasonal 

 migrations, alternate hosts, etc., which cannot be taken up in detail 

 within the limits of this paper. 



Ecologically, they may be chai-acterized as uniformly plant 

 feeders. Most of the species, pi-actically all for this region, attack 

 leaves, twigs or smaller branches. They multiply so rapidly and 

 form such large colonies that the drain on the plant from the 

 constant sucking of sap ^frequently results in wilting or withering 

 of plant infested. Such species as the Pine chermes, Alder blight 



Fi.tr. -1. — AldtT liliLilit. J'ctii]>hif/us IcsNiUtla : ii. much en- 

 larged; b, about natural si/e. riioto by Drake and Fivaz. 



