472 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION. 



56. The poplar gall-louse. 

 Pemphigus jpopuJariHS 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 antennae short, reaching 

 but two-thirds the distance lo 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 antennse 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 aud 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 gall-louse. 



Pemphigus popiiU-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 aud smaller dusky lice with the ends 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 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 length 0.07 and to the tip of their wings 0.11. (Fitch.) 



58. The poplar-vein gall-louse. 



Pemphigus populi-venw 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 coutainin^ 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 antennae reaching to 

 the base of the wings, which, with their oblique veins, are pellucid and colorless, the 

 coarse rib-vein being blackish aud moi-e 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. (Fitch.) 



Other insects occurriag on the poplar are the following: 



Order Lepidoptera. 



59. Papilio turmis Linn. (Miss O. G. Soule, Can. Ent., xviii, p. 1294 



60. Papilio gImiGus Linn. 



61. Papilio cresphontes Cramer. On P. dilatata (Scudder). 



62. Eugjnia jalhum B. and L. 



63. Limenitis arcMppus (Cramer) (Lintner, Ent. Contr., ii, p. 166.) 



64. Thanaos persiiis Scudd. 



