HOW TO KNOW THE IMMATURE INSECTS 



Fig. 27. a, Molamba lonota l-ec. ,< Redrawn 

 from Boving and Craighead) b, Sadd e- 

 badk slug caterpillar, Sobine stimulea 

 Clemens. 



Platyform (Fig. 27).— This 

 type is short, broad and 

 extremely flat. The legs 

 are short, inconspicuous or 

 absent. They are found in 

 the genera Microdon and 

 Xanthogrammci of syrphid 

 larvae, the larvae of some 

 slug caterpillars and those 

 of the water pennies, Pse- 

 pheus, hister beetles, etc. 



7. Vermiform (Fig. 28).— The larvae of this 

 type are more or less wormlike. This 

 designation is indefinite but is usually 

 considered to include larvae that are 

 cylindrical in shape, elongate and with- 

 out locomotive appendages. Most of 

 the larvae of Diptera are like that. This ,. ,,..^ , . 

 is also true of the larvae of woodboring l^i"'' ' 

 beetles, some sawflies and the flea 

 beetles of the genera Systena and Epi- 

 trix. The larvae of fleas and many para- 

 sitic Hymenoptera also belong to this 

 type. 



Fig. 28. Larvae: a, cabbage 

 root mag'got, Hylemyio bros- 

 sicae (Bouche); b, buffalo- 

 gnat, Simuiium pecuarum 

 Riley; c, common cattle grub, 

 Hypoderma lineatum (De 

 Villiers) under host skin. 

 (U.S.D.A.) 



8. Hypermetctmorphosis (Fig. 29). — This is a kind of complex meta- 

 morphosis in which there are several types of larvae, including: a 

 minute active first instar, a more or less robust and sluggish second 

 instar, and a similar but legless third instar. It is represented in the 

 Neuroptera (Mantispidae), Coleoptera (Meloidae, Carabidae, Sta- 

 phylinidae, Rhipiphoridae), Strepsiptera, parasitic Diptera (Acrocera- 

 tidae, Bombyliidae, Nemestrinidae, Tachinidae), and Hymenoptera 

 (Ichneumonidae, Pteromalidae, Perilampidae). The larvae of this 

 type often have special names. The first instar of Meloidae, Strep- 

 siptera and Mantispidae are called tiiungulins. They receive this 

 name because the legs have three claws. The fifth instar of Meloidae 



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