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Pleural areas largely devoid of scales except for a few post-spiracular scales; abdominal tergites banded or patched basally and apically with pale scales; scutal integument reddish-brown; aedeagus sub-parallel sided, broadly rounded or truncate. Larva: very difficult to distinguish from C. morsitans. Antennae as long as head capsule; antennal seta 1-A inserted in the distal third, with branches extending beyond the tip of the antenna; siphon six times longer than greatest width or longer; pecten teeth of the siphon small; head setae 5-C and 7-C usually with more than 6 and 8 branches respectively, seta 4-X (ventral brush) of anal segment generally with 20 or more setae.

Very little is known of this mosquito. Females overwinter as mated nullipars, emerging in early May to feed. Eggs are laid in a raft on the water surface. Larvae hatch in mid to late May. Larvae often cluster below aquatic vegetation, often in association with Culiseta morsitans. Mating habits are unknown. Blood-seeking adults have been collected in late summer, and it is believed that the species is likely multivoltine.