HOW TO KNOW THE IMMATURE INSECTS 



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3a. Maxillary palpi present, separated 

 from maxillae by a suture. 

 Fig. 494 4 



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Fig. 494. Cephalic aspect of 

 head and thorax. 



3b. Maxillary palpi absent 11 



4a. Dorsum of abdomen provided with fine spines, but not arranged 

 in rows 5 



4b. The anterior edge of some abdominal segments coyered with a row 

 of spines, sometimes with a second posterior row of spines 7 



5a. Maxillary palpi extending as a band along posterior margin of 

 eyes. (See Fig. 497) 6 



5b. Maxillary palpi not extending along posterior margin of eyes. 

 Fig. 495 .....A few GRACILARIIDAE 



Hibernation takes place either in adult stage 

 or in pupal stage. When in pupal stage, the 

 adult is well developed inside. 



More than 200 species of the genus pictured 

 are known. Many of them are highly economic. 



Fig. 495. a, Litho- 

 colietis hamadryadel- 

 la Clemens; b, Litho- 

 colletis argentinotel- 

 lo Clemens 9 • 



174 



