Larvae ofLonchaea corticisTaylor killed and consumed pupae and to a lesser extent prepupal larvae ofPissodes strobi(Peck) at temperatures ranging from 5 to l4°C during a 3-wk experiment in glass vials that were monitored weekly. Marginal predation of pupae but not prepupal larvae was observed at O°c. In simulated pupal cells ofP. strobistored outdoors in a Victoria, British Columbia, winter,L. corticislarvae killed and consumed pupae and prepupal larvae ofP. strobiin a 3-wk experiment that left most cells devoid of obvious prey remains. Tests in glass vials in March withL. corticislarvae collected during March and during the previous August showed thatL. corticislarvae remain predacious at the end of winter. When the insects were left in situ in severed leaders stored outdoors in a Victoria, British Columbia, winter, the proportion of pupal cells with liveP. strobidecreased significantly and the proportion of pupal cells emptied without insect emergence increased significantly; the numbers ofL. corticislarvae and totalP. strobipupal cells did not change significantly. These experiments show thatP. strobipupae and prepupal larvae can be vulnerable prey forL. corticislarvae and that predation may be common in the winter conditions of coastal British Columbia.