INJURIOUS AND BENEFICIAL INSECTS 



41 



preference, but frequently it will be found riddling the dried, 

 stored beans. 



Treatment: fumigate beans in all infested localities with car- 

 bon bisulfld as soon as threshed. 



82 Pea weevil (Bruchus pi- 

 s r u m). Brownish or black 

 beetles with indistinct white 

 markings, about ^^ inch long, in- 

 festing peas. Habits about the 

 same as those of the preceding 

 species, except that it attacks peas. 



Treatment: same as for bean 

 weevil. 



Fig. 74 Pea weevil : a natural size and 

 enlarged; b a pea containing weevil 



BENEFICIAL INSECTS 



83 Silk worm (B o m b y x m o r i). One case showing eggs, 

 larva, single and double cocoons, those from which moths have 

 emerged, one from which the silk has been reeled, male and 

 female moths and the raw silk; also several other silk spinners 

 and their cocoons, as follows: cocoons and moth of American 

 silk worm, Telea poljphemus; cocoon and pupa of 

 A n t h e r ae a y a m am a i , a Japanese silk worm; moth of 

 Antherae pernyi, a Chinese silk worm; cocoon and moth 

 of S a m i a c y n t h i a, a domesticated silk worm which feeds 

 mostly on the ailanthus tree. 



84 Pollen carriers. A great many insects convey pollen from 

 flower to flower, and in certain cases there are some very interest- 

 ing adaptations. Some of the more common pollen-carriers are 



Fig. 75 Wasp, enlarged (after Riley) 



Fig. 76 Sjrphus fly, adult— enlarged 



