THE THYSANOPTERA. 





Order 7. Tliysanoptera. — Thrips and its alli< 

 ferred by Baliday to a distincl order. The mouth-parta 

 form a sori of beak; the mandibles are bristle- 

 like ; the maxillae flat, triangular, bearing two- to 

 three-jointed palpi; the labial palpi are 

 short, two- 1" three-jointed. The wing mall, 



long and narrow, fringed; both pah equal 



size, usually without veins. antennas are 



five- to nine-jointed. 



Ord( r 8-. //< mipU ra. — The bugs ( Fig. 150) i 

 a long beak benl on the breast. They suck the 

 juices of plants and blood of in I :hinch- 



bug (Fig. l''l) is fearfully destructive in 

 rtain vears to corn ami wheal ; collecting 

 under the base of the leave- in great num- 

 3, it sucks the sap and kills the plant. 

 While mo8l insects live hut one and some 

 live two year-, the teen-year Cicada 



(Fig. 152) lives over sixteen years a- a larva. 

 becoming a pupa and finally acquiring 

 wings in the seventeenth year. 



The Aphis or plant-louse (Fig. 153) : 

 provide. 1 with two tubes on the end of the body from which 





Fig. 151. — Chinch-bug. a, I . ■ , larva: /. g, pu] 



"honey dew" drops, which attracts ants, wasps, In 



summer the female plant-lice bring forth young alive, and 

 as there may be nine or ten generations, one virgin Aphis 



