THE OLIVE 



103 



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

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

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

 taken together, more convex and without the transversal wrinkles 

 of the abdominal rings. 



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 body. 

 Antenna? inserted in the front of the head passing below the eyes 

 and the sides of the thorax, folding under in such a way that the 

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

 white in color with reddish eyes and jaws. 



This insect is distinguished from the Hylesinus principally by the 

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

 dilated into a three-bladed club (Fig. 11). The body is convex and 

 oval, and of a blackish brown color, and covered with an ashy yel- 

 low down. Antennae and tarsi deep yellow, upper 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 brilliant black in 

 color. 



The Phlcetribus count two generations. 



FIEST GENERATION. 



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

 in the forks of the bearing branches (Fig. 3, 4). In the first days 

 of spring, the insects abandon the nests to mate, after which they 

 assault the dead branches, where the bark is very smooth, and dig 

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

 ly first the bark and then the ring of the wood until they have a 

 road from a twelfth to an eighth of an inch in width, they 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, 



