i6 



half of the total width; the wing-covers have ten longitudinal series or 

 rows of punctures, and three of the interstices form elevated ribs. 



The insect winters in the adult stage, and the eggs are laid on the 

 young leaves the following spring. The eggs; which are white, short and 

 disc-like, with la thin shell, are deposited in masses of five or six. They 

 are placed in s^irow; the flattened surfaces: touching, and are covered w^ith 

 a brown shellac-like coating, by which they are, protected. On hatching, 

 •the young larvae break through the under side of the egg case and burrow 



Fig. 6. 



Black locust leaves showing injury caused by larvae and adults of the 

 Locust Hispa (Odontata dorsalis). (Original.) 



into the leaf tissue below. For a few days these larvje occupy the same 

 burrow, but usually all, except one, migrate to other leaves and form 

 mines in the tissue. The mines are quite characteristic, and may be dis- 

 tinguished from those of other leaf miners on the locust. The larvae 

 consume the whole of the parenchyma, of that portion of the leaf attacked, 

 making an irregular mine equally visible from either the upper or lower 

 surface. Tineid larvae eat only the parenchyma of the upper surface of 

 the leaves, so that the mines are visible from; that side only. 



The mature larvae are elongate, slightlv tanprino- rvoct£>r;o.-i„ . „„i„_ 



