INSECTS INJURIOUS TO THE POPLAR. 123 
duli green with a small coating of white flocculent wool, its opposite sides parallel 
and its tip abruptly rounded; the antenn short, thick, and thread-like; the wings 
dull hyaline, their rib-vein black and the oblique veins slender and blackish with the 
basal third of the third vein abortive and the fourth vein perceptibly thicker towards 
its base; and the small branch of the rib-vein bounding the anterior end of the 
stigma having nearly the same thickness with the rib-vein. (Fitch.) 
13. THE POPLAR-BULLET GALL-LOUSE. 
Pemphigus populi-globuli Fitch. 
In July, on the leaves of the balsam poplar slightly above their base, an irregular 
globular apple green gall the size of a bullet, projecting from the upper surface of 
the leaf, with a curved mouth-like orifice on the under side, the cavity within con- 
taining numerous small pale green and smaller dusky lice with the end of their bodies 
covered with short white cotton-like threads, and larger winged ones which are of a 
black color, with the abdomen dusted over with white meal and with thin white woolly 
fibres on the, back, and their antenn reaching the base of the wings, which are clear 
hyaline, their veins slender and white or colorless, except the outer marginal vein, 
which is black to the end of the stigma, and also the rib-vein, which is much thicker 
at its apex; their length 0.07 and to the tip of their wings 0.11. 
14. THE POPLAR-VEIN GALL-LOUSE. 
Pemphigus populi-vene Fitch. 
In July an oblong compressed excrescence like a cock’s comb, of a light red color 
varied with pale yellow, growing from the midvein of balsam poplar leaves on their 
upper side with an orifice on the opposite under side; a cavity within containing a 
multitude of lice and their white cast skins, interspersed with a whitish meal-like 
powder ; those with wings being black, with coarse thread-like antenne reaching to 
the base of the wings, which, with their oblique veins, are pellucid and colorless, the 
coarse rib-vein being blackish and more thick at its tip along the inner margin of the 
stigma, and the vein of the outer margin being blackish and somewhat coarse from 
its base to the stigma; its length 0.05 and to the tip of the wings 0.08. 
Other insects occurring on the poplar are the following :— 
15. Saperdavestita Say. On poplar in July, Providence (G. Hunt, p. 124). 
16. Xyleutes robine Harris. In Populus candicans. (Kellicott Bull. 
Buffalo Soc. Nat. Se., iv, 30.) 
17. Hgeria tibiale Harris. Found in New Hampshire on P. candicans 
Harris. (Amer. Journ. Sc., xxxvi, 1839, 309.) 
18, Limenitis misippus (Lintner, Contr., ii, 166). 
19, sLemenites disippus B.-Lec., Lintner, Proc. Ent. Soc. Phil., 1866). 
20. The prickly caterpillar, Hyperchiria io (Fabricius). On balsam pop- 
lar and aspen (Lintner, Coutr., ii, 146.) 
The prickly black caterpillar, Vanessa antiopa (Linn). 
Elm measuring worm, Lugonia subsignaria Hiibner. 
Notodonta dictea Linn. On aspen (Lintner, iv, 77). 
Cossus undosus Lintner (Contr., iv, 130). At Green River, Wyoming, 
probably on P. balsamifera). 
25, Smerinthus modesta Harris. On aspen (Kellicott). 
Tephrosia cribrataria Guenée, Larva on Populus tremuloides and P. 
JSastigiata (Guenée). 
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