Large milkweed bug
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|Large milkweed bug|
(Dallas, 1852) 
The milkweed bug, Oncopeltus fasciatus, is a medium–sized hemipteran (true bug) of the family Lygaeidae. It feeds mainly on grains, particularly those of the milkweed. Like all hemiptera, it feeds through a long mouthpart known as a rostrum. O. fasciatus is commonly used in science due to ease of rearing and ease of dissection.