504 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



liams gave the name Pemphigus halsamijerce. Professor Doane's 

 name having the priority, Wilhams' P. halsamifercv must be considered 

 as a synonym of P. beicp. 



Lice Liable to be Confused with P. bet^b 



In some collections the spring forms of P. hetce are labeled P. p-vence 

 Fitch. The gall of P. hetce differs from that of P. p-vence as described 

 by Dr. Fitch by being on the under side of the leaf opening above while 

 Dr, Fitch clearly states that the gall of P. p-vence is on the upper side 

 of the leaf opening below. 



Many times there occur on the leaves of the same tree and the same 

 leaf with the galls of P. hetce the galls of what the writer is considering 

 P. p-glohuli Fitch. These galls are on the upper side of the leaf at 

 the base of the leaf. They are nearly circular in cross section while the 

 galls of P. hetce are eliptical or narrowly oval in cross section. The 

 alate lice from these galls differ in the number of secondary sensoria 

 on joint VI of the antennae. P. hetce has no sensoria on VI or at best 

 very short oval sensoria which are not raised above the surface of the 

 joint and not as long as the diameter of it. Joint VI of P. p- 

 globuli has several annular sensoria. While P. hetce from the galls 

 has always taken to the beet in the cages the migrants of P. p-glohuU 

 have uniformally refused to colonize on the beet roots. 



Range of P. bet^ 



No report of the occurrence of P. hetce has been recorded from any 

 locality east of western Kansas and Nebraska. The writer has col- 

 lected Pemphigus sp. in most of the states west of the Mississippi but 

 has never taken P. hetw either on sugar beets or on any Populus sp. 

 east of the points mentioned. The range of the narrow-leafed cotton- 

 wood, Populus angustifolice , is given as from North Dakota to Wash- 

 ington and from New Mexico to California. It is probable that a better 

 knowledge of the locations where these trees occur and beets are not 

 grown in large acreages would reveal the fact that this insect's range 

 extends as far east as that of the host tree. 



In Colorado the number of narrow-leafed trees rapidly diminishes as 

 we go eastward from the mountains. 



There is a possibility that further study will show that some other 

 of the Pemphigus sp. occur on the beet during the summer. The only 

 species which the writer has not used in cage experiments is P. p- 

 ramulorum Riley. With the exception of P. halsamijerce all species 

 have repeatedly refused to take to beets. 



Chairman H. J. Quayle; This concludes the papers and the 



