Abstract
When eggs of Cadra cautella (Walker) (Lepidoptera: Pyralidae) were tested as hosts for Trichogramma evanescens Westwood (Hymenoptera: Trichogrammatidae), all eggs 0–60 hr old proved suitable for oviposition and development by the parasite. However, host eggs in the last 12-24 hr of incubation, the period when the morphological characteristics of the head of the embryo became evident, were progressively less suitable.