Table 1 in Descriptions And Recognition Of Larvae Of Some Northern North American Species Of Ilybius Erichson (Coleoptera: Dytiscidae)

Table 1. Diagnostic characters for distinguishing between larvae of the genera Ilybius Erichson and Agabus Leach as given by Galewski (1987) and Nilsson (1987). CharacterAgabusIlybius1. Last abdominal segment (RespiratoryShort or TruncateElongateSiphon)2. Position of dorsal setae of fore femora½ or <½ the length3 ⁄ or ⅔ the length 53. Abdominal segment VI membranousNarrowWidesternum