THE IMPORTED CABBAGE WEB WORM. 29 



erate (indoor 80° to 84° F.), showed that the eggs hatched three 

 days after deposition, a rather remarkably short period for the eggs 

 of a moth with a wing expanse of nearly three-fourths of an inch. 



THE NEWLY HATCHED LARVA. 



The larva when just hatched measures about a millimeter in length and 

 about a twelfth that in diameter across the abdomen. The head, as is usual 

 with young larvae, is prominent, wider than the body, and dusky in color. The 

 thoracic plate is also dusky and of somewhat similar suberescentic form to 

 the more mature stage. The body is very pale yellowish gray, nearly white, 

 and the surface is moderately clothed with long, fine hairs. 



Very soon after hatching the larva shows the characteristic striae of the more 

 mature form. Thus larvae 2 mm. in length are so little different in general 

 appearance from the full-grown ones as to be readily recognized as of the 

 same species. 



THE FULL-GROWN LARVA. 



The full-grown larva, shown at 7j and c of figure 4, measures a 

 little upward of half an inch in length, being about six times as long 

 as wide. 



The form is subcylindrical, tapering toward each extremity, widest near the 

 middle — the third, fourth, and fifth abdominal segments being nearly equal. 

 The general color is dull opaque grayish-yellow or yellowish-gray, striped with 

 broad, somewhat irregular, brownish-purple, longitudinal bands, which extend 

 from the second thoracic to the terminal or anal segment. These are bright 

 and conspicuous on the dorsal and more feebly indicated on the ventral surface. 

 The dorsal stripes are five — a moderately wide medial one, a broader medio- 

 lateral on each side, and. a dorso-lateral one, of about equal width with the 

 median one, also on each side. On each side below are two lateral lines, faint, 

 and interrupted toward the ends of each segment ; a similar ventro-lateral line ; 

 and a much fainter interrupted median line. 



The head is black and shining, the V-mark well indicated, the cervical or 

 thoracic shield is shining, light, somewhat purplish-gray, and is rather variably 

 marked with brown, which forms, each side of the median stripe of the second 

 thoracic segment, two irregular longitudinal dark brown patches, darkest and 

 widest toward the posterior margin. On each side above the spiracle of that 

 joint is a shorter dark patch. Near this there are sometimes two or three small 

 dark rounded spots. The spiracle of this segment is dark brown, the remainder 

 being concolorous with the body. The thoracic legs are more or less infuscated, 

 and the prolegs are nearly concolorous with the venter. The entire surface of 

 the body is sparsely covered with moderately long yellow and light brown hairs, 

 proceeding from small and shining piliferous tubercles. 



The anal shield bears from 10 to 12 round purplish spots, the most posterior 

 one the largest and standing alone, the remainder forming a suberescentic 

 pattern. 



The length when in natural position at rest is about 13 mm. and 

 when extended 15 mm., the width being a trifle more than 2 mm. at 

 the widest part. 



THE PUPA. 



The pupa is moderately shining, light yellowish brown in color and the sur- 

 face is covered with a light pruinose bloom. The eyes are dark brown, varying 



