Amongst insects which every year make theri presence noticeably apparent by their injuries, and thus win the distinction of being “Firstclass Pests” to the fruit-grower, not one, perhaps, is better known, nor, when not checked in its operations, more annoying than the currant worm, the larval state of the imported currant saw-fly, Nematus Ribesii, Scop. (=N. ventricosus, Klug).