HOW TO KNOW THE IMMATURE INSECTS 



35b. Frotito-clypeal suture obsolete in middle. 



Fig. 520 Famay OECOPHORIDAE 



Pupation takes place in hollow stem, or larval web, 

 or folded leaves, varying differently with the larval 

 habits. 



The larvae are often case makers. 



Fig. 520. Cryp' 

 tolechia querci- 

 cello Clemens. 



36a. Labial palpi exposed, lanceolate 37 



36b. Labial palpi invisible or reduced to a small area 41 



37a. Body with secondary setae (often minute), not arranged around 

 larval warts. Fig. 521 Family LASIOCAMPIDAE 



Pupation takes place in a silken cocoon hidden in 

 debris or other objects. Both the pupae and the eggs 

 have a smooth exterior. The nearly 30 members of 

 this genus do serious damage to trees. 



Fig. 521. Molp- 

 cosoma disstria. 



Hubner. 



37b. Body with primary setae only, or with setae around larval 

 warts 38 



38a. Prothoracic femur exposed 39 



38b. Prothorac. , femur concealed 40 



39a. Tip of abdomen with a group of pyramidal points, setae obscure; 

 mesothoracic legs touching maxillary palpi; 5th abdominal seg- 

 ment without special ridge (Diatraea) PYRALIDIDAE 



184 



