Abstract
Four types of trichoid sensilla were described on the ovipositor of the spruce budworm, Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae). Types I and III sensilla were short and long multiporous hairs, respectively. Type IV sensilla were long and aporous. Each was innervated by a single dendrite. Type II sensilla were multiporous and also had a single terminal pore. They were innervated by four dendrites. Electrophysiological responses were obtained from these type II sensilla to a range of chemical stimuli.
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