101 
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THERE ARE SEVERAL DISTINCT SUGAR-CANE BORERS. 
Ever since Guilding described his Diatrea sacchari, nearly all erambid 
borers in sugar-cane have been assumed to be identical with this species. 
IT assume that Guilding’s insect may be identical with our Louisiana 
borer since it is West Indian, and is likely to have been introduced . 
into Louisiana with seed cane. I can not, however, consult the deserip- 
tions of Guilding as his work is inaccessible. There are no salient 
points which would readily distinguish the moth or the pupa in a brief 
or a popular description; but the larva is rather peculiar among the 
Crambidze. The ordinary form in corn (Fig. 4, 7) when full-grownis about 
25 millimeters long, stout, 5 millimetres in diameter, and of the ordinary 
subeylindrical form. It is dirty white in color and is profusely spotted 
with black or brown, the ordinary piliferous spots being large and dark 
colored. They are arranged about as in the larva of Heliothis armigera. 
The anterior dorsal spots of the last two thoracic and first seven 
abdominal joints are 
large and round, those 
on the eighth and 
ninth abdominal joints 
being confluent (Fig. 
4, e). The posterior 
dorsal spots are more 
widely separated, are 
transversely | elonga- 
ted, and become con- 
fluent, forming a band 
on the second and 
third thoracie joints 
(Fig. 4, d). The head 
and thoracic plate are 
honey yellow. There Fie. 4.—Diatrea saccharalis: a, b, c, varieties of larva enlarged; d. 
is considerable varia- third thoracic segment; e, eighth abdominal segment; f, abdominal 
segment from side; g, same from above—still more enlarged (origi- 
tionin thesize of these aj), 
spots, and in some individuals they are comparatively small, while in 
others (alcoholic) they are so large as to give the whole larva a brownish 
effect. There are frequently in the alcoholic specimens two subdorsal 
purplish longitudinal lines, and the head and prothoracic plate vary 
from bright honey-yellow to brown. 
The Mauritius larva is described by Westwood as follows: 
The caterpillar has the head covered with a black plate, and the neck is also cov- 
ered with a paler colored plate, and the body is furnished with a number of short 
black hairs arising from small black points connected laterally by a pink band. 
This description shows the Mauritius species to be different from ours, 
and presumably from the West Indian form. 
Fabricius’s description of the larva of the South American species is 
as follows: 
