4-H CLUB INSECT MANUAL 23 



shown here is the adult of the flatheaded apple-tree borer (Chryso- 

 bothris fe?norata) . It is about one-half an inch long. 



Granary weevil. — There is a weevil, rather elongated — about one- 

 eighth of an inch in length — with a long nose, and 

 chestnut brown in color. The size of this insect >| 



may be compared to the grain of wheat upon which 

 it rests. This weevil lives indoors and attacks vari- 

 ous kinds of stored grains, often doing considerable 

 damage. The chewing jaws of the adults are located 

 at the end of the long, snoutlike head. Hind wings 

 or the ones used in flight are absent, so that the 

 insect can move about only by crawling. Like all 

 other Coleoptera, the weevils have four stages in 

 their life cycle — egg, larva, pupa, and adult. This 

 insect may have several generations a year, depend- 

 ing on the temperature. Fumigation with carbon 

 disulphide is the most effective control measure. The figure 54.— Gian- 

 scientific name of this insect is Sitophilim granarius. ary weevil. 



Bean weevil. — Entomologists are often asked during the winter or 

 early in the spring for information about infestations of a rather 

 small insect about one-eighth of an inch long discovered flying about 

 the house and windows, or perhaps by some housewife when pre- 

 paring dry beans for cooking. This insect has a body that tapers 

 sharply to the head, four wings, and a few white markings on its 

 back. The adults fly rather readily to the green beans 

 in the field and lay their eggs in the pods. Soon after 

 hatching, the larvae burrow inside the bean and con- 

 tinue to develop with it. Small circular holes often seen 

 in dry beans indicate that the beans have been infested 

 and the weevils have left the bean through these holes. 

 When the dry beans are placed in storage, if the weather 

 is warm, the insects continue to breed all the year 

 f 1 g u e e 55.— through, but when the weather is cold the larvae remain . 



Bean^ee\ii. j nac tive. The bean weevil belongs to the order Cole- 

 optera, and is called Acanthoscelides obtectus. It may be controlled 

 by fumigation or heating. 



LEPIDOPTERA (BUTTERFLIES AND OTHERS) 



Where is the boy or girl who never chased a butterfly? But did 

 this boy or girl ever consider that the butterfly came from a small 

 worm, or larva as the entomologists call it? Butterflies, moths, and 

 skippers have a great deal in common. Their life cycles are the 

 same in that they consist of four distinct stages, the egg, the cater- 

 pillar (or feeding stage), the pupa (or resting stage), and the adult 

 butterfly or moth (the reproducing stage). The butterfly, pupa, and 

 larva are quite unlike one another in appearance. This group of 

 insects carries the name "Lepidoptera," which means "scale wings," 

 and everyone who has handled a butterfly or moth knows that the 

 four wings are covered with a fine scaly powder which, when brushed 

 off, leaves a clear wing. The butterflies and moths have sucking- 

 type mouth parts, but the young, or caterpillars, have chewing mouth 

 parts. 



Cabbage butterfly. — Possibly one of the most common of these 

 butterflies is the little white cabbage butterfly, which has a wing 



