PLATE II 



Sugar Beet Root-louse, Pemphigus betas Doane Page 



Fig. 1 Newly hatched louse feeding on cottonwood leaf (See "A"). 55, 58 



2 Newly hatched louse (Enlarged) 55, 57 



3 Upper side of leaf after gall becomes closed 55, 58 



4 Side view of young gall 55, 58 



5 Fully developed gall 55, 58 



6 Full grown stem-mother (Enlarged) 55, 58 



7 Full grown second generation louse (Spring migrant) 



(Enlarged) 55, 58 



8 Antenna of Figure 7 (Enlarged) 55,58 



9 Wingless form of sugar beet root-louse found on beets dur- 



ing summer (Enlarged) 55,58 



10 A lady-beetle which feeds upon sugar beet root-lice (En- 



larged) 59, 115, 132 



1 1 Antenna of wingless louse (Enlarged) 55,58 



12 Antenna of wingless louse (Enlarged) 55, 58 



1 3 Antenna of true male sugar beet root-louse, Figure 1 6 (En- 



larged) 55,57 



14 A true bug, Authocoris melanocerus , which feeds on lice in 



gall (Enlarged) 59, 132 



15 Larva of lady-beetle (Figure 10), which also feeds on lice 



while on beets (Enlarged) 59, 115, 132 



16 True male sugar beet root-louse (Much enlarged. Note 



minute representation of actual size at left of colored 

 picture) 55,57 



17 Solitary egg laid by female sugar beet root-louse (Enlarged).55, 57 



18 True female sugar beet root-louse (Much enlarged. Note 



minute representation of actual size at left of colored 

 picture) ^ 55, 57 



Note: Incase of enlargement, a natural size black and 

 white outline drawing is shown beside the colored picture. Ex- 

 ceptions to this plan on Plate II are Figures 2, 8, 11, 12, 13 

 and 17. 



12 



