.,;rHE OLIVE 103 



gin of the fore part of the head, the eyes scarcely discernible, plac- 

 ed behind the hisertion of the jaws, the thorax fuller than the rest 

 of the body, the upper thorax a little larger than the next two rings 

 taken together, more convex and without the transversal wrinkles 

 of the abdominal rino's. 



The chrysalis (Fig. 9) ovoid, oblong, with head inclined towards 

 the breast, shield wing fluted and embracing the abdomen at the 

 sides, the feet exposed and drawn up on the ventral part of the bodv. 

 Antennae inserted in the front of the head passing below the eves 

 and the sides of the thorax, foldino- under in such a wav that the 

 end of the proboscis or club reaches to the fore feet. It is a dirtv 

 white in color with reddish eves and iaws. 



This insect is distinguished from the Hylesinus principally by the 

 antennae of nine joints. The first six are simple, the last three are 

 dilated into a three-bladed club (Fio. H). The bodv is convex and 

 oval, and of a blackish brown coloi", and covered with an ashv vel- 

 low down. Antennae and tarsi deep yellow, uppqr thorax broader 

 than it is long, and unequally speckled; the shield wing is over twice 

 as long as it is wide, rounded at the extremities and covering exact- 

 ly the abdomen with nine lengthwise flutings delicately speckled ; 

 the feet robust and rather short, the femora of a l)rilliant black in 

 color. 



The Phloetribus count two generations. 



FIRST GEXEEATIOX. 



In the autumn and winter each insect hides itself in a nest dug 

 in the forks of the bearing branches (Fio. 3, 4). In the first davs 

 of spring, the insects abandon the nests to mate, after wdiich thev 

 assault the dead branches, where the bark is verv smooth, and dio' 

 a trench in which to deposit their eggs, (Fig. 1, 2,) gnawing oblique- 

 ly first the bark and then the rino- of the wood until thev have a 



*— I, 



road from a twelfth to an eiohth of an inch in width, thev then re- 

 trace their steps, following always the ring of the wood. The female 

 now commences to deposit her eggs singly to the right and left. 



