CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 1 75 



Eggs. — Nearly spherical; honey-yellow changing in parts to reddish- 

 brown; laid singly on leaves of food-plant; hatch in 5 to 9 days. 



Larva. — The Celery Caterpillar; mature form 2 inches long; green, 

 each segment with a black band and spotted with yellow. Scent- 

 horns orange. 



Chrysalis. — Dull grey, mottled with dull brown, roughened with 

 larger projections pointing forward; swung in a loop of silk; summer 

 chrysalis lasts from 9 to 18 days; hibernates. 



Control. — Hand-picking, or the application of arsenicals for large 

 infested areas. 



PIERIDiE 



The more common butterflies of this family are the Cabbage 

 Butterfly (Pieris rapce), the Grey- veined White {P. napi), the Check- 

 ered White (P. protodice) the Clouded Sulphur {Eurymus philodice) 

 and the Alfalfa Caterpillar {Eurymus eurytheme). 



Cabbage Butterfly {Pieris rapcelAnn.). — Introduced from Europe via 

 Quebec about i860. Occurs throughout United States and Canada. 



The caterpillars first injure young plants, riddling the outer 

 leaves, later they attack the tender inner leaves where they are hard to 

 poison, and which they render unsightly by reason of the abundant dark 

 green excrement. Sometimes they eat into the centre of the head of 

 cabbage where it is impossible to deal with them. 



Adult. — Wing expanse 2 inches, dull white above; fore wings with 

 black tips and two spots in the female and one spot in the male. Two 

 full broods and a partial third in the North, and more in the South. 

 Life-cycle 3 to 6 weeks. 



Eggs. — Oval, yellow, ribbed, lengthwise and crosswise; laid singly 

 on end on the leaves; hatch in 4 to 8 days. 



Larva. — The Green Cabbage worm; I'jyi inches long, velvety green 

 with a narrow greenish-yellow band on back and on each side. A row 

 of yellow spots. Matures in 10 to 14 days; feeds also on mustard and 

 other crucifers. 



Chrysalis. — Three-fourth inch long, hght brown; attached and 

 swung by a girdle of silk. Winters in this condition. Duration in 

 summer 7 to 12 days. 



Enemies. — Apanteles glomeratus, Pteromalus puparum, paper wasps, 

 ambush bug. 



