HOW TO KNOW THE IMMATURE INSECTS 



21b. Spiracles circular, very small; the last pair about in line with 

 others Family COLEOPHORIDAE 



22a. Abdominal setae iv and v remote, or v absent in a 

 few small species. Fig. 439 23 



Fig. 439. Setal 

 map of an ab- 

 dominal segment. 



22b. Abdominal setae iv and v adjacent, often on a 

 common tubercle. Fig. 440 27 



^' 



-\ 





Fig. 440. Setal 

 map of an ab- 

 dominal segment. 



23a. Prolegs with crochets arranged in a single com- 

 plete ellipse. Fig. 441 24 



23b. Prolegs with crochets arranged in a broken el- 

 lipse, or with additional rudimentary series at 

 the base of normal ones. Fig. 442 26 



Fig. 441. Cro- 

 chets in a single 

 complete ellipse. 



Fig. 442. Cro- 

 chets in brok- 

 en ellipse. 



157 



