THE MOUNT DESERT REGION 39 



Trioza Foerster 



T. TRiPUNCTATA Fitcli. Common at the foot of Western Mt., 

 July to Sept. The nymphs are gregarious on the under 

 side of the terminal leaves of the blackberry, causing them 

 to curl and form rosette-like bunches. 



PsYLLA Geoffroy 



P. ANNULATA Fitch. 'Mt. Descrt,' July 30 (McAtee). The 



nymphs live on maple. 

 P. FLOCcosA Patch. 'Mt. Desert,' July 30 (McAtee). The 



nymphs live on the growing twigs of alder. 

 P. CARPixicoLA Crawf. Salisbury Cove; S. W. Harbor, July 



15-Aug. 30. 

 P. TEiMACULATA Crawf. Salisbury Cove; S. W. Harbor, July 



15-Aug. 30. 



Aphididae. Plant-lice 

 Eriosoma Leach 



E. LANiGERUM Hausm. Woolly aphid. Bar Harbor. The 

 brood from the over-wintering eggs form the leaf clusters 

 known as 'rosettes' on the elm, then migrate to the apple 

 and thorn, and return to the elm in the fall. 



Prociphilus Koch 



P. TESSELLATA Fitch. Woolly Alder aphid. Migrates between 

 the maple and alder. 



Melaphis Walsh 



M. RHOLS Fitch. Large rounded galls on the leaves of the 

 staghorn sumach. 'Mt. Desert' (J. G. Jack). 



Pemphigus Hartig 



P. popuLi-CAULis Fitch. Bar Harbor; Salisbury Cove, Aug. 

 Forms galls at the base of the leaves of poplar. 



HoRMAPHis Osten Sacken 



H. HAMAMELiDis Fitch. Bar Harbor. Forming conical galls 

 on the leaves of the witch hazel {Hamamelis virginica) and 

 migrating to birch {Betula). 



