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18. Euura orbitalis, Norton. 
Greenish white; head dusky. Length of full grown larva .18 to 
.19 of an inch. Number of feet, twenty. 
Produces galls on the willow {Salix humulis). 
19. Euura salicis-ovum, Walsh. 
A pale yellow color, head very pale dusky, having the usual lat¬ 
eral eye-spots. Length about one-tenth of an inch. Number of feet, 
twenty. 
20. Euura salicis-gemma, Walsh. 
Greenish white in color. Head tinged with dusky and having the 
usual dark eye-spots on the sides. Length about twenty-hundredths 
of an inch. Number of feet, twenty. 
Burrows two or three inches under the ground where it spins a 
silken white cocoon, to which particles of earth are attached externally. 
Forms galls on the buds of the humble willow (Salix humulis). 
21. Euura salicicola, Smith. 
Light pea-green in color. Head pale brown; labrum and ends of 
mandibles fuscous; the eye-spots, spiracles and claws of tarsi brown. 
Head and body hairy. Average length .24 of an inch. Number of 
feet, twenty. 
This species is found only on new limbs of the willow (Salix alba ). 
The female perfect insect inserts her eggs in longitudinal slits in 
the bark. 
The larva works its way into the pith, upon which it subsists. 
It spins an oval, yellowish silken cocoon within the twig in which 
to pass the winter. 
22. Pristiphora identidem, Norton. 
Light or pale yellowish green when first hatched, but grows darker 
with age. The full larva has two lighter whitish green lines 
running along the back from head to tail. After the first moult the 
head is pale honey yellow. 
Length .80 of an inch. Feet, twenty-two in number. The perfect 
insect appears in the latter part of June. 
The larvfe feed on the cranberry. 
Pristiphora grossularm:, Walsh. 
Color, pale grass-green without the black dottings found in the 
imported species before the last moult; head black, becoming green 
after the last moult, but with a lateral brown stripe on each side 
of the head, coming together at the top. Length, half an inch. 
Feet, twenty-two in number. 
It is two brooded, appearing in the latter part of June and early 
in July, and again in August. The currant and gooseberry are its 
food plants, upon which it also spins its cocoon. 
The female fly is shining black, with the head dull yellow and 
the legs honey yellow. 
