Dec. zx, 19x6 
Syntomaspis druparum 
495 
and the mandibles from 0.036 to 0.039 mm * long. At full growth the 
second instar is about 1.5 mm. long. 
With each succeeding molt the larva becomes gradually stouter and 
less tapering behind until at full growth it is more than a third as thick 
as long, with the caudal end but little more tapering than the head end, 
and the head becomes relatively smaller and more retracted within the 
thorax. With each molt the 
head and mandibles increase 
markedly in size, and the lat¬ 
ter change somewhat in form. 
These changes in measure¬ 
ments and form constitute 
the only real differentiating 
characters until in the last 
instar the spiracles become 
open and visible. 
The head of the third-instar 
larva varies in breadth from 
0.277 0.308 mm. and the 
length of the mandibles from 
0.050 to 0.057 mm - The lat¬ 
ter (fig. 5, b) are curved to¬ 
ward the apex. In the fourth 
instar the head is from 0.415 
to 0.461 mm. broad and the 
mandibles (fig. 5, c) 0.079 to 0.086 mm. long and nearly straight at the 
apex. 
The full-grown or fifth-instar larva (fig. 6) is of the typical chalcid form, 
rather spindle-shaped but somewhat curved toward the ventral side, 
with the head short and flattened and partially retracted within the first 
thoracic segment. The mesothoracic 
and metathoracic segments and the 
first seven segments of the abdomen 
bears each a pair of minute spiracles. 
Fully fed larvae are mostly from 4.5 
to 5 mm. long, but a few, which 
develop in small seeds, are much 
smaller, the smallest measured being 
3 mm. in length. The head is from 
0.554 °-6 mm - broad and the mandible (fig. 5, d), the blade of which 
is rather slender and nearly straight, is from o.ni to 0.129 long. 
The arrangement of the mouth parts is shown in figure 7. 
Place of feeding. —The earlier feeding of the larva is done in the 
gelatinous portion of the developing seed. In the meantime the embryo 
is developing and the gelatinous body is being absorbed. Before the 
Fig. Syntomaspis druparum: Mandibles of larvae of vari¬ 
ous instars. o, Second; 6, third; c, fourth; d, fifth. Highly 
magnified. (Original,) 
Fig. —Syntomaspis druparum: Full-grown larva. 
Much enlarged. (Original.) 
