Delphacids planthoppers are insects related to leafhoppers, treehoppers, spittlebugs and cicadas. Most species are between 2-4 mm in size. Most species are grass-feeders, although some feed on broad-leaved plants, especially those in the aster family.
If it looks generally like this:
And has a spur on the apex of the hind leg, it is a delphacid.