372 Watter N. Hess 
The egg : 
When laid, the egg is pure white in color and is somewhat viscous, with 
a thin, fragile shell. It is ovoid in shape, being widest near the anterior 
end and tapering slightly toward the posterior. The shape, however, 
varies considerably, since owing to 
the softness of the shell it is easily 
modified by the shape of the crevice’ 
in which the egg is deposited. The 
entire surface is marked with very 
irregular elongate areas (fig. 61). The 
Fic. 61. pees ee aie ae ies os M, egg measures 1.9 millimeters ane by 
0.7 millimeter wide. 
The egg stage lasts from eight to ten days, varying with weather con- 
ditions. In emerging, the young larva ruptures the egg in the lateral 
anterior region, usually on the right side. This it does by rubbing the 
sides of its head against the sides of the chorion, finally 
slitting the latter longitudinally. On each side of the head 
is a group of coarse setae which probably function in this 
process. 
BENS 
The larva 
The newly hatched larva (fig. 62) is whitish in color and 
is shightly fiattened. It is more rounded, however, than the 
mature larva, resembling rather the typical cerambycid 
type. The head and the thorax are slightly wider than the 
abdomen. The head is light brown in color, as are also 
‘the mouth parts except for the mandibles, which are dark 
brown toward the tips. At each side of the head is a group 
of coarse setae with dark brown chitinized basal parts, while ey : 
scattered over the entire larva are a number of slender, HT M\\ 
elongate setae. Piguet 
Very soon after emergence, the newly hatched larva works INSTAR OF 
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LARVA, DOR- © 
its way through the outer bark into the cambium layer, J.) iw 
where the larval life is spent. The larva at this stage is 
very delicate and soon perishes unless it reaches the cambium layer, where 
it begins at once to feed. 
The mature larva (Plate VIII, 3) is long and is very much flattened, 
as a result of which it has been incorrectly called a flat-headed borer 
