• Coppel, H.C.
  Div of Entomology, Dept of Agriculture, Ottawa, Canada
  
• Maw, M. G.
  Laboratory of Entomology, Belleville, Ontario
  

The tachinid parasite Ceromasia auricadata Tns., which had been transferred from Western to Eastern Canada for release against the spruce budworm Choristoneura fumiferana (Clem), is an insect that deposits macrotype eggs on leaves, which are later ingested by the host. Eggs hatch immediately after ingestion, but the parasite does not develop beyond the first larval stage until the host pupates. Then, the larva develops rapidly, maturing within 10 days. The mature larva leaves the host pupal case, drops to the ground, and pupates usually within 24 hours. Nine to 11 days later, the adult emerges. Very little information is available on the overwintering habits. The life history, habits, and rearing methods are outlined and important characters of the immature stages are illustrated and described.