Abstract
The following article relates briefly certain features connected with the shipment to Salt Lake City, Utah, of Bathyplectes Curculionis (Thoms.), an internal parasite of the larva of the alfalfa weevil, Phytonomus posticus (Gyll.). It describes the release of the parasite in Utah, its rapid diffusion, and the various methods used since its colonization there to determine the extent of parasitism attained by it. Its previous history and its geographical distribution are considered.

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