Which species is described as a cool-weather mosquito?

• A. Cs. incidens
• B. Cs. inornata
• C. Cx. pipiens
• D. Psorophora ciliata

Answer: (A)

Cool-weather mosquitoes are those that stay active or peak in activity when temperatures are cooler, often in fall or mild winter conditions. Culiseta incidens fits this pattern, as it is known for being active in cooler conditions and can persist into cooler seasons. That makes it the best match for a mosquito described as a cool-weather species. The other species align with different patterns: Culex pipiens is a common temperate-climate mosquito with a broader activity range not specifically defined by cool-season activity; Psorophora ciliata is a floodwater species tied to rainfall events and less linked to cool-weather behavior.