HOW TO KNOW THE IMMATURE INSECTS 



3. Eruciform (Fig. 24). — This type of larva is cylindrical, the thoracic 

 legs and prolegs are present and the head is well formed. It is well 

 illustrated in the Lepidoptera, Tenthredinidae and Mecoptera. 



Fig. 24. Larvae: a, alfalfa caterpillar, Eurymus eurytheme 

 (Boisduval); b, tomato hornworm, Protoparce sexta 

 (Johnssen); c, tussock moth, Hemerocampo vetusta 



Boisduval; d, tomato fruitworm or corn earworm, 



Heiiothis obsoleta Fabricius. (U.S.D.A.) 



4. Scarabaeiform (Fig. 25). — The acarabaeiform larva is cylindrical and 



curved in U-shape with a well 

 developed head and usually 

 with thoracic legs but without 

 prolegs. There are a pair of 

 spiracles on the prothorax and 

 eight pairs of abdominal spir- 

 acles. This type of larva is 

 typical of the Scarabaeidae. 

 It is also represented by the 



^ ^^ . ^ , . u« «. Bruchidae, Ptinidae, Anobiidae, 



Fig. 25. Larvae: a, Anomalo konsana Hayes 



& McColloch; b, clover leaf weevil, Q^d Other Coleoptera. 



Hypero punctata (Fab.) ^ 



Elateriform (Fig. 26). — These larvae are cylindrical in 

 shape with a thick tough body wall. The setae are 

 much reduced, the legs are usually present but short. 

 They resemble both the vermiform and carabiform 

 larvae. This type is well represented by the Elateri- 

 dae, Tenebrionidae, AUeculidae, Ptilodactylidae and 

 Eurypogonidae. 



Fig. 26. False 

 wireworm, Eleod- 

 es letcheri von- 

 dykei Blaidell. 



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