PERGANDE NORTH AMERICAN PHYLLOXERINiE. 239 



Forming pedunculate, ovoid or globular galls on the under side 

 of leaves of Hicoria alba; the gall white or yellowish, pubescent, 

 and gummy or sticky ; opening below in a fibrous point. The 

 eggs are almost spherical, pale and translucent. lyarva, mother- 

 louse and pupa quite pale, the red eyes and eyelets strongly con- 

 trasting. The winged insects with difficulty distinguished from 

 some of the other species, a difficulty made all the greater from 

 the fact that other species get caught in the sticky surface of the 

 gall. 



Stem-mother. — Length about i"""-; elongate pyriform, more 

 than twice as long as broad. Front edge of head somewhat 

 concave and furnished with four short, stiff hairs above, one 

 at base of antennas and one in front of the eyes ; two each side 

 of the thoracic and one each side of the abdominal segments, and 

 from six to eight around the end of the body. Entire surface 

 densely and very finely granulate, with a few more prominent 

 warts on the thoracic segments, each bearing a stout hair. There 

 are also some minute hairs, sparsely set, along the posterior mar- 

 gins of the abdominal segments. Antennae as usual, with the 

 third joint about twice the length of the two basal joints com- 

 bined, and of almost uniform diameter throughout. Thumb 

 very short. Surface indistinctly scaly and annulated. 



Group III. 



21. Forming elongate folds along the veins beneath, with corre- 

 sponding ridges or carina; above Ph. caiyavena Fitch. 



There is but one species in our fauna representing this group. 



Phylloxera cary^ven^ Fitch. 



Pi. VI., figs 38-39; PL XIII., figs, 98-105. 



Pemphigus ? caryxvence Fitch. Third Rep. Nox. and Ben. Ins. of 



N. Y., Section 164, p. 126. 

 Phylloxera carycevence Riley. Eighth Rep. Nox. and Ben. Ins. of 



Mo., p. 117. 

 Phylloxera caryxvencs Thomas. Eighth Rep. Nox. and Ben. Ins. 

 of Ills., p. 162. 

 The galls of this species we readily separated from those of any 



