THE CANADIAN ENTOMOLOGIST, 223 



situated behind the antennre, are enormously large and very conspicuous. 

 The larva is a large fat white grub, with powerful jaws of a darker colour ; 

 it feeds upon the wood of the Pine, and from its size often injures the 

 timber very materially. 



4. Clytus robinice Forst. — The Locust tree Borer. (The synonymy 

 of this insect has been rather perplexing ; it is now included in the genus 

 Cyllene Newm. ; for a long time we were accustomed to call it Clytus 

 flexuosiis Fab., but the specific name given above has the priority. It was 

 also long considered to be identical with C. pictus Drury, that bores into 

 the Hickory, but the late Mr. Walsh proved satisfactorily that the two 

 species are distinct.) — The general colour of this insect is deep black with 

 light yellow stripes ; on the head and thorax these stripes form narrow 

 transverse bands, but on the wing-covers there is first of all a narrow yel- 

 low anterior edging (not shown in the figure), then a slightly flexuous 

 stripe (not straight as in the figure) ; this is followed by a narrow zig-zag 

 band forming a letter W across the wings, and three irregularly wavy and 

 broken stripes ; there is also a yellow dot at the tip, and broader stripes 

 on the sides of the abdomen of the same colour. The antennae are long 

 and many-jointed, and of a dark brown colour ; the legs are long and of a 

 tawny hue. The larva is a whitish coloured grub, about an inch long and 

 the thickness of an ordinary goose-quill, and is furnished with six very 

 minute legs. When young it appears to bore chiefly into the sap-wood, 

 but afterwards strikes off into the solid wood of the tree, perforating it in 

 every direction. Its presence is early indicated by the little heaps of saw- 

 dust extruded from the holes, and accumulated about the base of the tree. 



• 



The history of this insect is rather a curious one. For a little over a 

 hundred years it has been known to inhabit the State of New York, its 

 appearance and habits being recorded by some English Entomologists of 

 the last century. About thirty years ago it was found as far west as 

 Chicago, whence it spread throughout the State of Illinois, but it was not 

 till 1S63 that it reached Rock Island, about 200 miles further west, where 

 — Mr. Walsh relates — it suddenly appeared in great swarms and utterly 

 destroyed all the Locust trees. The first record we have found of its 

 appearance in Canada is by Mr. Couper, who states (Can. journal, 

 1^55' P- 377) that he observed some Locust trees attacked by this insect 

 in Montreal in September, 1855. In 1862 it began to be very destructive 

 to the Locusts in Toronto, and for several years was excessively abundant 



