326 INSECTS INJURIOUS TO VEGETATION. 



in August the one above described makes a tough cocoon of 

 bits of wood and bark glued together with a sticky matter, and 

 fastened to the side of a branch, the lower side being flat and 

 the upper convex. The last transformation occurs about the 

 middle of June, when, after the end of the cocoon has been 

 softened by a liquid thrown out by the insect within, the moth 

 forces its way through. Tiiis insect has been figured in Mr. 

 Abbot's work,* where it is called furcida, a name, however, 

 which belongs to an European insect. It is also represented 

 in Guerin's " Iconographie," and in Griffith's translation of 

 Cuvier's "Animal Kingdom;" and I have adopted the specific 

 name given to it by Dr. Boisduval in these works. Cerura 

 borealis, the northern Cerura or fork-tail moth, like others of 

 the genus, has the antennae feathered in both sexes, but nar- 

 row, and tapering and bent upwards at the point; the legs, 

 especially the first pair, which are stretched out before the 

 body when at rest, are, like those of our native Limacodes, 

 very hairy; and the wings are thin and almost transparent. 

 The ground-color of our moth is a dirty white; the fore wings 

 are crossed by two broad blackish bands, the outer one of 

 which is traversed and interrupted by an irregular wavy whitish 

 line ; the hinder margins of all the wings are dotted with black, 

 and there are several black dots at the base and a single one 

 near the middle of the fore wings; the top of the thorax is 

 blackish, and the collar is edged with black. In some indi- 

 viduals the dusky bands of the fore wings are edged or dotted 

 with tawny yellow; in others these wings are dusky, and the 

 bands are indistinct. They expand from one inch and three 

 eighths to one inch and three quarters. 



The following insects, for the sake of convenience, may be 

 included in the old genus Notodonta. The first of them is 

 found in August and September on plum and apple trees, and, 

 according to Mr. Abbot,f on the red-berried alder, Prinos verti- 

 cillatus. The top of the fourth ring of this caterpillar rises in 

 the form of a long horn, sloping forwards a little ; the tail, with 

 the hindmost feet, which are rather longer than the others, is 



* "Insects of Georgia," p. 141, pi. 71. t "Insects of Georgia," p. 171, pi. 86. 



