ECONOMIC ENTOMOLOGY. 57 



cides, and their destruction prevents the second brood from 

 developing. 



Professor Forbes found "that a simple mechanical mix- 

 ture of water and three per cent, of kerosene " was deadly 

 to bugs of all ages, nor did it injure the corn, provided the 

 kerosene was well emulsed. 



The corn should be sprayed with this fluid. He found 

 the cost of this mixture to be about four mills per gallon. 

 With proper appliances the cost ought not to exceed five 

 dollars an acre. And "if by treating a strip at the outer 

 edge of a corn field, — the few rows nearest a ripening field 

 of wheat for example,- -the whole field could be protected 

 against the savage ravages of the bugs, it would certainly 

 pay the farmer well to undertake this task." 



The greatest practical results, however, will probably 

 be obtained through the natural enemies of the Chinch Bug. 

 It was found that lady-bugs and predaceous ground-beetles 

 destroy a considerable number. 



But by far the most deadly enemy of the Chinch Bug is 

 a species of bacteria. This infests the stomach and other 

 internal organs, and much resembles that found by Pasteur 

 in the silk worm. Professor Forbes' method is to cultivate 

 this silk worm virus for the destruction of various insect 

 pests. 



HARLEQUIN CABBAGE BUG. 

 (Murrjantia [Strachia) histrionka. Hahn.) 



This insect derives its name from its gay colors and 

 harlequin-like manners. 



The eggs are about one-twentieth of an inch in length, 

 and very beautiful little fellows too. They are laid in two 

 parallel rows of some half a dozen each. Says Kiley: 

 " When first deposited they are green in color, but soon be- 



