90%. Barley bugs belong to the phylum Arthropoda, class Insecta, order Coleoptera, and the family Carabidae. The larvae are 70 mm to 80 mm long, the body width is 5 mm to 6 mm, and a single worm weighs 1.3 to 1.5 grams. It is three to four times the body length, weight, and width of its mealworm or black mealworm (the background in the picture is a comparison of the scale and the size of the mealworm). Introduced from Southeast Asian countries in recent years, they are called barley bugs or super mealworms.