BULLETIN 966, U. S. DEPARTMENT OF AGEICULTURE. 



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 E. rimosalis 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. 6), which is evidently well coated 

 on the exterior with a viscid substance 

 to which particles of sand become at- 



■^■^ 





U)rm 





'!!( f% 



Fig. 4. — Full-grown larva of 

 European horse-radish web- 

 worm : a. Dorsal view ; h, 

 lateral view. Four times nat- 

 ural size. 



tached. These cocoons are 

 large in comparison to the 

 pupa and irregular short 

 oval in shape. 



THE PUPA. 



The pupa 

 (fig. 6) is of 

 robust form 

 with long- 

 wing cases 



Fig. 5.- 



-Cocoons of European horse-radish web- 

 worm. Much enlarged. 



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. 



DISTRIBUTION. 



Evergestis straminalis is native to the Old World, 



Fig. 6. — European 

 horse-radish web- 

 worm: Pupa. 



urai size. where it is found in Central Europe and in Great 



