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Description
Adult insects often range from 4 to 40 mm. They most commonly have an elongated head with a distinct narrowed neck, long legs, and a prominent, segmented tube for feeding (rostrum). Most species are dark in color with hues of brown, black, red, or orange. The most distinctive feature of the family is that the tip of the rostrum fits into a groove in the prosternum, where it is rasped against ridges there (a stridulitrum) to produce sound, a tactic often used to intimidate predators. If harassment continues, they can use their rostrum to deliver a painful bite which in some species can be medically significant. The saliva of the reduviid species Rhynocoris marginatus (Fab.) and Catamirus brevipennis (Servile) have anti-bacterial activity towards the human pathogens Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, Salmonella typhimurium) and one Gram-positive (Streptococcus pyogenes).

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Description
Adult insects often range from 4 to 40 mm. They most commonly have an elongated head with a distinct narrowed neck, long legs, and a prominent, segmented tube for feeding (rostrum). Most species are dark in color with hues of brown, black, red, or orange. The most distinctive feature of the family is that the tip of the rostrum fits into a groove in the prosternum, where it is rasped against ridges there (a stridulitrum) to produce sound, a tactic often used to intimidate predators. If harassment continues, they can use their rostrum to deliver a painful bite which in some species can be medically significant. The saliva of the reduviid species Rhynocoris marginatus (Fab.) and Catamirus brevipennis (Servile) have anti-bacterial activity towards the human pathogens Gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa, Proteus vulgaris, Salmonella typhimurium) and one Gram-positive (Streptococcus pyogenes).

Source [link]