THE MOUNT DESERT REGION 99 



E. laxigerum Hausmann. Has the elm for the over winter- 

 ing host and then migrates to Pyrus and Crataegus return- 

 ing to the elm in autumn. 



Prociphilus Koch 



P. corrugaxs Sirrine. Sal. Cove Emery Dist. Fuzzy and 



yellow on Amelanchier. July 21. 

 P. imbricator Fitch. Woolly patches on beach. Long Pond, 



July. 

 P. tessellata Fitch. Migrates between maple and alder 



where it forms woolly patches on stem. Common. 



Melaphus Walsh 



M. rhois Fitch. Pear shaped or round reddish galls are 

 formed on sumac (Bit us) in September. On Sept. 24, '37 at 

 the foot of Newport Mt. I found the larva of a Syrphid fly 

 in many of these galls which when reared proved to be 

 Pipisa sp. 



Pemphigus Hartig 



P. populi - caulis Fitch. Forms galls at the base of poplar 



leaves. Bar Harbor, Sal. Cove in Aug. 

 P. popili - traxsversus Riley. Forms galls on the stems of 



poplar. Corfield, July 10. 



Hormaphis Osten Sacken 



H. hamamelidis Fitch. Forms conical galls on the leaves of 

 witch hazel (Hamamellis virginica) and migrates to birch. 

 Common. 



Chermes Linnaeus 



C. abietis Linn. Spruce gall aphid which forms the conical 



galls on spruce. Common in Aug. 

 C. floccus Patch. Occurs generally on white pine. 

 C. piNicoRTicis Fitch. Pine bark aphid which occurs on the 



trunk of white pine in flocculent masses. 



