INSECTS INJURIOUS TO THE BUTTERNUT. 339 



of flocculent 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 

 larvse 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 larvte 

 in a letter to Mr. E. Norton, our best authority on 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 carycv, 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 unacquainted 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 ecutellum 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. Antennae 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 submedian 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. 



Larva. — 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 flocculent 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). 



