4 BULLETIN 966, U. S. DEPARTMENT OF AGRICULTURE. 
The larva has been described as purple, but the mature larva ex- 
hibits no evidence of this color in life. When preserved in alcohol 
there is a reddish and sometimes slightly 
purplish tinge. 
The larva can be readily separated 
from that of /. rzmosalis by the com- 
plete lack of transverse striation and 
by the black head. 
When about to transform to pupa, the 
larva forms, usually at or near the sur- 
face of the ground, a substantial cocoon 
(fig. 5), which is evidently well coated 
on the exterior with a viscid substance 
to which particles of sand become at- 
Fig. 4.—Full-grown larya of 
European horse-radish web- 
worm: a, Dorsal view; 0, 
lateral view. Four times nat- 
ural size. 
tached. These cocoons are 
large in comparison to the 
pupa and irregular short 
oval in shape. 
z THE PUPA. 
The pupa 
(fig. 6) is of 
robust form 
Fig. 5.—Cocoons of European horse-radish web- 
with long worm. Much enlarged. 
wing cases 
extending to the antepenultimate segment of the abdomen. 
It is widest below the middle across the wing cases and at 
its widest part is three-eighths as wide as long. The general ~ 
color is brownish yellow, but the wing cases have a distinct 
‘greenish tinge. The eyes are large and black. The last 
abdominal segment is prolonged and unarmed. 
The length is 8 mm.; the width, 3 mm. 
Fic. 6.—European DISTRIBUTION. 
horse-radish web- 
worm: Pupa. Evergestis straminalis is native to the Old World, 
Six times nat- a on 
ural size, where it is found in Central Europe and in Great 
