78 INSECTS INJURIOUS TO FOREST AND SHADE TREES. 
puncture the ping causing them to wither or raising galls upon them. 
iA The following species 
have been noticed by 
Fitch: 
42. THE HICKORY-STEM GALL- 
LOUSE. 
Phylloxera caryecaulis (Fitch). 
Forming bullet-like galls, 
hollow, green, and of a leath- 
ery texture, upon the leaf- 
stalks and succulent young 
} shoots, with the walls of the 
‘W) cavity inside covered with 
, minute white and yellow lice. 
43. HICKORY-VEIN GALL- 
LOUSE. 
» Phylloxera caryevene (Fitch). 
Forming plaits in the veins 
of the leaves, which project 
up from the surface in an ab- 
ruptly elevated keel-like 
ridge upon the upper side of 
the leaf and with a mouth 
opening ou the under side, 
the lips of which are woolly 
and closed. The wingless fe- 
males minute, pale yellow, 
broad in front, and tapering 
behind to an acute point; 
antenne and legs short and 
tinged with a dusky hue. 
44, THE HICKORY LEAF-WITH- 
ERER. 
Phylloxera caryefolice Fitch. 
Forming small conical ele- 
vations on the upper surface 
of the leaf of Carya alba, each 
haying an orifice in its sum- 
mit; a very small black plant- 
louse with a pale abdomen 
Fic. 36.—The walking stick. a, b, eggs; ¢, young just hatching; and legs and smoky wings 
d, male; ¢, female.—From Riley. ' Jaid flat on its back, and hay- 
ing only three veins in addition to the rib. Length, 0.06 inch. (Fitch.) 
45. THE SEED-GALL HICKORY PHYLLOXERA. 
Phylloxera carye-semen (Walsh). 
Forming fuscous, minute, subglobular, seed-like galls on the leaves of Carya glabra, 
the galls opening in a small nipple on the under side. (Walsh.) 
46, THE HICKORY ROUND-GALL. 
Phylloxera carye-globuli Walsh. 
Forming hemispherical galls about 0.25 inch diameter on the upper surface of the leaves 
of carya glabra and alba, the galls rather flat below, where they open ina slit. (Walsh.) 
