ORDERS OF INSECTS 



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metamorphosis. Example, white ants or termites (these must not 

 be confused with true ants). 



Order Corrodentia. Small four-winged insects; biting mouth 

 parts; incomplete metamorphosis. Winged species feed upon 

 lichens. A well-known wingless form is the tiny book louse. 



Order Mallophaga. The so-called bird lice (not true lice, 

 which are sucking insects), feeding upon feathers on birds and fur 

 on mammals; wingless parasites with biting mouth parts; meta- 

 morphosis incomplete. 



Order Euplexoptera. Earwigs found in the South and on the 

 Pacific Coast; rare in northeastern United States. The name ear- 



FIG. 15. Dragon fly: below, nymph; on left, pupal skin. 



wig is given them because of a popular and erroneous belief that 

 they creep into the ears of people when asleep. The wings are 

 rudimentary. Posteriorly the abdomen has a pair of appendages 

 resembling forceps. The metamorphosis is incomplete (Figs. 16 

 and 17). 



Order Thysanoptera. (Thrips.) Minute four-winged insects. 

 Many are especially injurious to agriculture. The mouth parts 

 are evidently used for sucking. The metamorphosis is incomplete. 

 Some species can be found by pulling apart blossoms of clover or 

 daisies (Fig. 18). 



Order Orthoptera ("straight- winged"). Here occur the 



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