HOW TO KNOW THE IMMATURE INSECTS 



31b. Crochets of prolegs usually multiordinal; abdominal setae iv and 

 V in a diagonal or vertical line. 

 Fig. 455 Family TORTRICIDAE 



The caterpillars are leaf rollers. 

 ^They are destructive to many 

 kinds of trees and other plants. 

 The larvae vrhen disturbed wriggle 

 violently and may escape back- 

 wards from the nests of rolled 

 leaves. The spruce budworm, Ar- 

 chips fumiferana (Clemens) ana 

 the fruit tree leaf roller, Azchips 

 argyiospila (Walker) are impor- 

 tant pests. 





Fig. 455. o, Clover-seed caterpillar. 

 Laspeyresia interstinctana Clemens; b, 

 setal map of an abdominal segment. 



32a. Abdominal setae i and ii close together. 



Fig. 456 fSchreclrensteinia; Family HELIODINIDAE 



t&ii 





a 



The members of this genus of sun moths are plant 

 feeders. All are of small size. The family is interest- 

 ing in that a few species are apparently predacious 

 on scale insects. 



Fig. 456. Seta! 

 map of an ab- 

 dominal segment. 



32b. Abdominal setae i and ii widely separated. 

 Fig. 457 



33 



0-SfVMX: 



V/} 



Fig. 457. Setal 

 map of on ab- 

 dominal segment. 



162 



