A significant effect (P = 0.002) of moonlight on light trap catches of Anopheles nuneztovari females was observed during a longitudinal study in western Venezuela. The catch with no moon was 1.86 times larger than with full moon. Nevertheless, moonlight does not seem to have any effect on the composition of adult mosquito population since the difference in the parous rate of females collected during full moon and during no moon was not significant (P greater than 0.05).