Triatomines range in length from 5 to 45 mm, with the majority of species falling between 20 to 28 mm. Most species are black or dark brown, often with contrasting patterns of yellow, orange or red. The head of an adult triatomine is constricted posteriorly, forming a distinct neck. The region in front of the eyes is cylindrical to conical, supporting the name ‘cone-nosed’ bugs. For further key characteristics see Krinsky (2019).