222 
Bugs, Cicadas, Aphids, and Scale-insects 
grown in five days, and the quiescent pseudo-pupal stage lasts four days. 
The grass-thrips is the cause of the injury or disease of meadow and pasture 
grasses known as “silver top” or “white top,” a common trouble in the 
northeastern states. The male sex seems to be wanting in this species, the 
young all developing parthenogenetically. 
