472 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 
56. The poplab gall-louse. 
Pemphigus popularius Fitch. 
Late in autumn, wandering up and down the trunk of the balsam poplar, a gall- 
louse closely like the preceding, but its abdomen green, its antenna? short, reaching 
l»iit two-thirds the distance to the wing sockets, and the rib-vein of its wings not 
thicker along the inner margin of the stigma; its length 0.13 to the tip of its wings. 
The female black, slightly dusted over with a glaucous gray powder; the abdomen 
dull green with a small coating of white flocculent wool, its opposite sides parallel 
and its tip abruptly rounded ; the antenna) 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.) 
57. The poplar-bullet c, all-louse.* 
Pemphigus populiglobuli 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 month-like orifice on the under side, the cavity within con- 
taining numerous small pale green and smaller dusky lice with the ends of their bodies 
covered with short white cottou-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 fiber on the back, and their antennae reaching the base of the wings, which 
are clear hyaline, their veins slender and white or colorless, except the outer mar- 
ginal vein, which is black to the end of the stigma, and also the rib-vein, which is much 
thicker at its apex ; their lerigth 0.07 and to the tip of their wings 0.11. (Fitch.) 
58. The poplar-vein gall-louse. 
Pemphigus populi-venoe Fitch. 
In July an oblong compressed excrescence like a cock's comb, of a light red color 
varied with pale yellow, growing from the midveiu 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 antenna? 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 veiu 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. (Fitch.) 
Other insects occurring on the poplar are the following: 
Order Lepidoptera. 
59. PapiUo tumus Linn. (Miss C. G. Soule, Can. Ent., xviii, p. 129.[ 
60. PapiUo glaucus Linn. 
61. PapiUo orsphontes Cramer. On P. dilatata (Scudder). 
62. Eugonia j album B. and L. 
63. Limenitis archippus (Cramer) (Lintner, Ent. Contr., ii, p. 166.) 
64. Thanaos persius Bcndd. 
