Synonyms and other taxonomic changes
Numbers
7 spp. in our area, 13 total
(2)(1)Size
adult 10‒16 mm, larva 15‒30 mm
Identification
Adult: top of head yellowish with two dark transverse bands, the anterior band undulate or M-shaped; pronotum yellowish with two dark transverse bands on disc, not terminally, as in Graphoderus; notched spur on hind tibia; elytral mottling or speckling less pronounced than in Graphoderus; elytra punctate (and longitudinally sulcate in female)
Larva: swimming hairs present on last two abdominal segments; ligula deeply bifid
in
Graphoderus elytra more heavily mottled/speckled, and dark transverse pronotal bands located apically
Range
Holarctic, widespread (including the arctic)
(1)Season
Year-round with adults most frequently encountered in spring during mating season and late summer when they disperse
Life Cycle
Adults overwinter in permanent water bodies and disperse to breeding sites during spring; larvae complete development later in the spring and into the early summer; newly emerged adults disperse to overwintering sites later in summer/fall
(3)
