6 BULLETIN 571, U. S. DEPARTMENT OF AGRICULTURE. 
more susceptible to attack by certain wood-boring insects and less 
able to withstand drought in summer* 
During the summer and early fall the larvae, then very small and 
feeding but little, will be found attached to the underside of the 
leaflets in brownish, minute, tortuous, and winding cases (PL I, fig. 5 ; 
PL III, fig. 2), which greatly resemble at a glance brown spots such 
as might be caused by certain fungi. These tiny cases are enlarged 
only as it becomes necessary for the larvae to build their way to new 
feeding areas. A detailed description of the larval cases as they 
appear during the summer and fall months is given on page 7. So 
far as the writer has observed, the injury caused to the foliage during 
the fall is so slight that the leaves do not fall prematurely. 
DESCRIPTION. 
THE EGG. 
The egg is elliptical in outline, somewhat convex above and 
flattened below. Viewed with the hand lens the surface is quite 
smooth, but under higher magnification it is very faintly punctate. 
When first deposited the egg is white with a slight greenish tinge, 
translucent, and iridescent in some lights. The empty shell is white. 
The average size of five eggs was found to be 0.55 by 0.33 mm. (0.0216 
by 0.0129 inch). The eggs are deposited singly on the underside 
of the leaflet and usually at the junction of the veins with the midrib. 
Moths confined hi rearing cages (battery jars) have been noticed 
sometimes ovipositing upon the upper surface of the leaves, but in 
no case has the writer observed such oviposition under natural 
conditions. (PL I, fig. 1.) 
THE LARVA. 
Upon hatching the larva is a little less than a millimeter (0.039 
inch) in length. The head and prothoracic shield are brown in 
color, while the rest of the body is of a much lighter shade of brown. 
When extended the full-grown larva averages about 14.5 mm. 
(0.5708 inch) in length by 2.0 mm. (0.0787 inch) in greatest width. 
The head is round, shiny dark brown or blackish in color, and slightly 
rugose. The general color of the body is very dark green, except 
the prothoracic shield, which is somewhat lighter. The shape of 
the larva is nearly cylindrical, tapering slightly at both ends, but 
more posteriorly than anteriorly. The body is sparsely covered 
with fine long hairs and on either side of the dorsal surface of the 
second thoracic segment is a small well-defined tubercle, from the 
black center of which arises a fine hair. The skin, especially in the 
thoracic region, is quite wrinkled, there being a pair of crescentic 
folds on the dorsum of the second and third, segments. Rudiments 
of these folds are evident on the other segments, but they are not 
prominent. The first four pairs of prolegs are quite short, only 
