Mosquitoes are small, with slender bodies. The body and legs are coloured ranging from pale brown to black, sometimes marked with spots and stripes. 

Adult mosquitoes are present in Québec throughout the spring and summer and even fall in some years, since the activity periods may vary, the different species follow each other year after year.

The months of June and July are more favourable to the growth of mosquitoes. These insects are particularly active late afternoon, after sunset, early morning or after rain.