HOW TO KNOW THE IMMATURE INSECTS 



46a. Body with secondary setae 47 



46b. Body with primary seiae or none 48 



47a. Body with rather coarse, short secondary setae; cremaster rudi- 

 mentary. Fig. 526 Family BOMBYCIDAE 



Pupation takes place in white or yellow thick 

 silken cocoon. The Chinese silkworm yields 70 mil- 

 lion pounds of raw silk annually. 



Fig. 526. Bom- 

 byx mori L. 



47b. Body with fine, soft secondary setae; cremaster well developed. 

 Fig. 527 Family NOTODONTIDAE 



The pupa is often naked and protected by an earth- 

 en cell. Other species spin a scanty cocoon which 

 frequently contains some of the debris in which it is 

 placed. 



CJ^e^Asrei^ 



Fig. 527. Phry- 

 ganidia colifon 

 nica Pacic 



48a. Antennae not pectinate; spiraculor furrows often present; fronto- 

 clypeol suture distinct at ends 49 



48b. Antennae pectinate; spiracular furrows rarely present; fronto- 

 clypeol suture wanting. Fig. 528 Family SATURNIIDAE 







- -V PKote^ SCAK 



Pupation takes place in dense silken co- 

 coons which have been utilized for silk by 

 man. 



Fig. 528. Somia ceeropio 



187 



