HOW TO KNOW THE IMMATURE INSECTS 



LARVAE 



18a. Thoracic legs absent or represented 

 by paired fleshy swellings on meso- 

 thorax and metathorax or on all thor- 

 acic segments 19 



18b. Segmented thoracic legs always pre- 

 sent on 2 or all thoracic segments. .34 



19a. Thoracic legs represented by unseg- 

 mented, fleshy, paired protuberances 

 (called pedal lobes) on 2 or 3 thorac- 

 ic legs. Fig. 73 20 



19b. Thoracic legs never present 22 



Fig. 





73. Dendroetonus fron- 

 foils Zimm. 



20a. Adfrontal areas, spinneret, and one or more pairs of simple eyes 

 usually present; prolegs with crochets on 3rd to last abdominal 

 segments (except Nepticulidae without crochets on prolegs of 2- 

 7th abdominal segments). Fig. 74. .Order LEFldDOPTERA page 149 



Fig. 74. A, Cephalic aspect of the head of Cera- 

 mlea picta (Horr.); B, Caudal aspect of 

 the labium of Cirphis unipuncta (Haw.); 

 C, The maple case-bearer, Paraclemen- 

 sia acerifoliella (Fitch) : a, larva; b, 

 case. 



The order is a large 

 one numbering about 

 110,000 species. Eggs 

 are highly variable in 

 size, shape, sculptur- 

 ing, color and arrange- 

 ment. Larvae are 

 known as caterpillars, 

 and have 3 pairs of 

 segmented thoracic 

 legs. The abdominal 

 segments bear prolegs 

 which ore armed with 

 crochets. The head 

 bears adfrontal areas. 



20b. Not so. 



.21 



41 



