PLATE XrV. 
Fig. 1 . — Chionaspis salicis-nigrce Walsh, on Salix sp. Anal plate of fe- 
male. • 
Fig. 2 . — Chionaspis americana Johnson, on Ulmus americana. Anal 
plate of female, (a) Variation in margin of median and second lobe ; (b) illus- 
trates marginal variations and forked plates. 
