INSECTS INJURIOUS TO THE BUTTERNUT. 339 
offlocculent matter (exactly resembling that produced by the woolly plant- 
lice and other homopterous insects), forming an irregular dense cottony 
mass, reaching to a height equal to two-thirds the length of the worm, 
and concealing the head and tail. On the 27th and 28th of July the 
larvre molted, leaving the cast skins on the leaf. They were then naked, 
a little thicker than before, of a pale-green color, and their bodies were 
curled upon the leaf. The worms eat out the edge of the leaf. Some 
time during August two cocoons were spun between the leaves, but 
I did not succeed in raising the saw-flies. On describing, the larvae 
in a letter to Mr. E. Norton, our best authority ou this hymenopterous 
family, he kindly sent me alcoholic specimens of the larvse (without the 
woolly substance, which dissolves and disappears in alcohol) found 
feeding on the hickory, which are, apparently, from the comparison of 
alcoholic specimens, identical with the butternut Selandria. The adult 
fly he named Selandria caryce, and his descriptions are given below. 
Previously to this, and without my knowledge, Dr. Fitch, under the 
name of Selandria f juglandis, had apparently briefly described in his 
third report the same insect, but he was uuacquainted with the perfect 
insect, and was in doubt as to whether the larva was a Selandria or 
not. Under these circumstances we retain Mr. Norton's name. From 
his account it would appear that the insect also feeds on the hickory 
(Carya squamosa). 
Female. — Color shining black. The pro- and meso-thorax and scutellum rufous, the 
apex of the latter black; the nasus and legs white, with their tarsi blackish ; the 
base of coxae and a line down the upper side of the legs black. Antennas short ; the 
second joint as long as the first; the four final joints together not longer than the 
two preceding. Nasus slightly incurved. Claws of tarsi apparently bifid. Wings 
subviolaceous; lanceolate cell petiolate, the first submediau cell above it with a dis- 
tinct cross-vein. Under wings with one submarginal middle cell (all other species 
have this cell discoidal), the marginal cell with a cross-nervure, and all the outer 
cells closed by an outer nervure, which does not touch the margin. The submediau 
cell extended nearly to the margin. Length, 0.25 of an inch. Expanse of wings, 
0.40 of an inch. 
Male. — Resembles the female, but the under wings are without middle cells. 
Ibarra. — Feeds upon the leaves of the hickory (Carya squamosa). They are found 
upon the lower side of the leaf, sometimes fifteen or twenty upon one leaf, 
which they eat from the outer extremity inward, often leaving nothing but the 
strong midribs. They cover themselves wholly with white rlocculent tufts, which 
are rubbed off on being touched, leaving a green twenty-two-legged worm, about 
0.75 inch in length when fully grown ; darkest above, and with indistinct blackish 
spots upon the sides. The head is white, with a small black dot upon each side. 
Specimens were taken upon the leaves July 4. Went into the ground about the 20th 
of July. The cocoon is formed near the surface of the ground of a little earth or 
sand drawn together. Four specimens came forth about August 22, all seemingly 
very small for so large larvae. (Norton in Packard's Guide to the Study of Insects. ) 
7. Smerinthus juglandis (Abbot and Smith.) 
(Larva, Plate xi, fig. 4.) 
This caterpillar perhaps more commonly occurs on the walnut, but it 
also feeds on the hickory ( Carya alba) and the iron- wood ( Ostrya virginica). 
