Redescription of the larva of Leucorrhinia glacialis Hagen with a key to the nearctic Leucorrhinia species (Anisoptera: Libellulidae)

The final-stadium larva is redescribed from 24 authenticated larvae and exuviae. It is a medium-sized larva (total length 17.6-20.8 mm) with three ventral stripes and a dorsal pattern on the abdomen that includes large spots in the sublateral area on at least segments 4-7. The penultimate stadium is also briefly described and some natural history observations are reported. A key for the seven nearctic Leucorrhinia spp. is given.