The oviposition behavior of the predatory mosquito. Toxorhynchites amboinensis, was examined in a 1.0 ha tire yard in St. Joseph County, Indiana. A total of 129 laboratory-reared Tx. amboinensis females was released. Egg production was monitored by checking for eggs daily in 86 marked tires distributed in 4 distinct habitats. Of the 3,134 eggs recovered during the 28-day period after release, 49% were from a transect of 26 tires in a wooded area, 28% were from 20 tires in a completely shaded tire pile, 22% were from 20 tires in a partially shaded pile, and the remaining 1% were recovered from 20 tires in an exposed tire pile. Toxorhynchites eggs were found in every available tire sampled in the wooded area and in both types of shaded tire piles, but only 15% of the tires sampled in the exposed tire pile received any eggs. On the 24th day after release, 3rd and 4th instar Toxorhynchites larvae were common in shaded tires. The high fecundity and the preferential oviposition in shaded areas indicates that Tx. amboinensis should be considered for the control of mosquitoes that develop in shaded tires.