CHALCIDOID (HYMENOPTERA) PARASITES OF THE HORN FLY, HAEMATOBIA IRRITANS (DIPTERA: MUSCIDAE), IN ALBERTA AND ELSEWHERE IN CANADA

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Abstract
The horn fly in Alberta has been reported as being parasitized by five species of Chalcidoidea (Depner 1968, Can. Ent. 100: 1057–1060). These identifications are corrected to Muscidifurax raptor G. & S., M. zaraptor K. & L., Eupteromalus viridescens (Walsh), Spalangia drosophilae Ashm., S. subpunctata Foerst., and S. e. erythromera Foerst. The last two were not known in North America; neither they nor the Muscidifurax spp. had been noted as parasitizing horn fly. The Spalangia spp. can be credited with parasitizing up to 40% of horn fly pupae in traps and the Muscidifurax spp. up to 30%. E. viridescens seems to be an adventitious parasite of horn fly.