Description: A quarter-inch-long parasitic wasp, Peristenus digoneutis, prepares to lay an egg in a tarnished plant bug nymph. Photo by Scott Bauer for USDA. Image Number K7867-1. Date: 2003. Source: http://www.ars.usda.gov/is/graphics/photos/index.html. Author: Scott Bauer for USDA.