136 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 7 



Phorodon galeopsidis Kalt. Infesting the under side of the leaves of 

 Polygonum sp. Collected July 25, 1912, at San Jose, Cal. 



Ampliorophora ruhicola Oestl. 



Collected on the leaves and terminal shoots of thimble-berry {Rubus 

 nutkanus Moc), May 13, 1913, in hilly canyons of Contra Costa Co., 

 Cal. At that date about 95 per cent, of the lice were large pupae or 

 recently transformed adults. The dusky spot at the apex of the wing, 

 mentioned by Oestlund (Synopsis of the Aphididse of Minnesota, 

 1887) was present in all alate specimens examined. 



Macrosiphmn ludoviciance Oestl. What I take to be this species 

 was observed infesting Artemisia heterophylla. The lice appeared 

 first about February 6, 1913, at which date the plants were about 

 eight inches in height. Toward the end of the month winged forms 

 were produced and these migrated to other plants, the original centre 

 of infestation in the area of plants under observation being confined 

 to one plant. Several plants were destroyed by the lice settling in 

 masses on the growing stalk but finally towards the end of April alh 

 the lice either left the area of plants under observation or were de- 

 stroyed by enemies. Locality: Walnut Creek, Cal. 



Macrosiphum rudbeckice Fitch. This louse in California seems to 

 confine itself to the teasel (Dipsacus fullonum L.). I have collected 

 it on many occasions in the vicinity of San Jose, California. 



Additional Explanation of Figures 



Camera lucida drawings, nos. 1, 2, 4, 9, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,/22-eye- 

 piece no. 1, objective 16mm.; nos. 3, 5, 6-eyepiece no. 1 (tube 170mm.), objective 

 16mm.; nos. 7, 8, 11-eyepiece 1, objective 3in.; fig. 10-eyepiece no. 1 (tube 170mm.), 

 objective 3in. 



THE LIFE HISTORY OF THE SUGAR-BEET ROOT-LOUSE 

 (PEMPHIGUS BETAE DOANE) ' 



By J. R. Parker, Montana Experiment Station 



Considering how scanty is the knowledge of life histories in the genus 

 Pemphigus, it is thought worth while to set before the entomological 

 public the life history of the economically important species. Pemphi- 

 gus hetce Doane. This species is the most important pest of the sugar 

 beet in Montana and each year does considerable injury, the tonnage 

 in badly infested fields sometimes being reduced a third. A study of 

 its life history was begun as an Adams project in 1909, but not until the 

 past summer were all the stages in its complex life cycle known. 



1 The investigations upon which this paper is based were carried on at the Montana. 

 Experiment Station as an Adams project under the direction of Professor R. A. 

 Cooley, Station Entomologist. 



