Delphacidae A family (synonym: Areaopidae) of about 1,000 described species of cosmopolitan planthoppers in the order Hemiptera They usually feed on the phloem and many species transmit virus diseases. Website https://www.google.co.il/search?q=delphacidae&biw=1280&bih=687&tbm=isch&tbo=u&source=univ&sa=X&ved=0CBoQsARqFQoTCPaAmPGugMkCFYRCFAod8QIAcw