32 



INSECTS INJURIOUS TO STAPLE CROPS. 



name is received from two wliite dashes on the black 

 thorax, which converge posteriorly. The thorax has also 



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a white margin, and there are thirteen black dots on its 

 orange wing-covers. These larva? and l^ectles are very 

 common among the plant-lice on melon-vines, and are an 

 important factor in their extermination. They have also 



