360 ILLINOIS STATE HORTICULTURAL SOCIETY. 



furrowed between the eyes; thorax barrel-shaped, not spined, rough and 

 punctured, some smooth prominences placed in a transverse line in front 

 of the middle; scutel small, rounded, yellow; wing-cases punctured with 

 large punctures, two-spined at the tips, outer spines largest ; length of 

 female, over five-eighths of an inch ; width, five-sixteenths. This species 

 appears to be found throughout the State, but not in great abundance. 

 The larvae live in the branches of the black and white oaks ; following 

 the pith or heart of the slender branch, they eat their way forward, 

 enlarging as they go, until finally the branch is severed and falls to the 

 ground. They appear here in the latter part of May and June. Prof. 

 Peck has given an account of the operations of the larvae of this species : 



"The perfect insect lays its eggs in July," (in Massachusetts). "Each egg is 

 placed close to the axilla or joint of a l(^af stalk, or of a small twig, near the extremity 

 of a branch. The grub hatched from it penetrates at that spot to the pilh, and then 

 continues its course towards the body of the tree, devouring the pith and thereby form- 

 ing a cylindrical burrow, several inches in length, in the center of the branch. 



" Having reached its full size, which it does towards the end of summer, it divides 

 the branch, at the lower end of its burrow, by gnawing away the wood transversly from 

 within, leaving only the ring of bark untouched. It then retires backwards, stops up 

 the end of its hole, near the transverse section, with fibers of the wood, and awaits the 

 fall of the branch, which is usually broken off and precipitated to the ground by the 

 autumnal winds. Branches of five or six feet in length and one inch in diameter are 

 thus severed by these insects. By collecting the falling branches in the autumn and 

 burning them before the spring, we prevent the development of the beetles, while we 

 derive some benefit from the branches as fuel." 



Clytus (^Glycobius) speciosiis, Say. 



Is found in the northern part of the State, but as yet I have captured 

 none in this section. The body is black ; head with yellow band on the 

 front above the antennae; antennae black; thorax globular, with two 

 obi ique yellow spots each side, the latter being the longest. The wing-cases, 

 when closed, appear thus : A yellow spot on each shoulder, a diagonal 

 on each running outward from the scutel ; next a zigzag line running 

 across both, forming a W ; next a narrow transverse band, then another 

 a little wider, and finally the tips have a broad band of the same color 

 (yellow), with a spot each side of the suture of black. The intermediate 

 color between these yellow bands is a purplish black ; length about one 

 inch; width one-third. This depredates upon the sugar maple. 



Clytus robinice, Foot. Locust-tree Borer. 



This and the preceding species also belong to the sub-family Ceram- 

 bycides, of the long-horned beetles. Antennae brown, shorter than the 

 body, inserted in a notch in the upper side of the eye ; a yellow cross- 

 band on the head immediately behind the antennae ; another band along 

 the hind margin of the head, which borders the eyes behind, curving 

 around and then on the cheek ; thorax barrel-shaped, black, surrounded 

 by four yellow bands ; wing-cases brown, crossed by five zigzag, whitish 

 lines, shoulders and tips margined with the same; breast and abdomen 



