During the National Stamp Collecting Month in 1999 the USPS issued this colorful sheet featuring 16 insects and four spiders. The species of insects and spiders on the stamps were chosen because of their educational value and interest to children. The species represent the wide range of colors, lifestyles, and behaviors exhibited by these amazing creatures. On the back of each stamp is a description of the bug on the front. The 20 stamps include the following: Black Widow, Elderberry Longhorn, Lady Beetle (Ladybug), Yellow Garden Spider, Dogbane Beetle, Flower Fly, Assassin Bug, Ebony Jewelwing, Velvet Ant, Monarch Caterpillar, Monarch Butterfly, Eastern Hercules Beetle, Bombardier Beetle, Dung Beetle, Spotted Water Beetle, True Katydid, Spinybacked Spider, Periodical Cicada, Scorpionfly, and Jumping Spider.