. Bulletin of the U.S. Department of Agriculture. Agriculture. 2 BULLETIN 841, U. S. DEPARTMENT OF AGRICULTURE. chance to ivod upon the various cultivated plants grown in bulk by the farmer or gardener, many of these insects gradually desert their native host plants and to a greater or less degree change their habits, including in their fare the more succulent and easily found food. HISTORY The existence of the western grass-stem sawfly v^as first made known in 1890 when Mr. Albert Koebele reared adults from larvse that were mining in the stems of native grasses growing in the vicinity of Ala
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. Bulletin of the U.S. Department of Agriculture. Agriculture. 2 BULLETIN 841, U. S. DEPARTMENT OF AGRICULTURE. chance to ivod upon the various cultivated plants grown in bulk by the farmer or gardener, many of these insects gradually desert their native host plants and to a greater or less degree change their habits, including in their fare the more succulent and easily found food. HISTORY The existence of the western grass-stem sawfly v^as first made known in 1890 when Mr. Albert Koebele reared adults from larvse that were mining in the stems of native grasses growing in the vicinity of Alameda, Calif.^ During the next year, 1891, the species was described under the name of Cephus occidentalis by Messrs. Riley and Marlatt, from a series of individuals reared by Mr. Koebele and also. Fig. 1.—Western grass-stem sawfly ( Cephas cinclux): Adult female. Much enlarged. from cotypes that had in the meantime been collected in Nevada and Montana.- In connection with this description the prophetic suggestion was made that: "The economic importance of this species arises from the fact that it may be expected at any time to abandon its natural food-plant in favor of the small grains, on which it can doubtless successfully develop." Nothing more was heard of this sawfly until 1895, when the late Dr. James Fletcher, Entomologist to the Dominion of Canada, swept adults at Indian Head, Northwest Territories, on July 5. He believed it to belong to the European species, Cephus pygmaeus 1j., and under 1 Koebele, A. Notes. In U. S. Dept. Agr. Div. Ent. Insect Life, v. 3, p. 71, 1890. 2 Riley, C. V., and Marlatt, C. L. Wheat and Grass Saw-Flies. In U. S. Dept. Agr. Div. Ent. Insect Life, V. 4, p. 168-179, 1891. (See p. 177-178.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. United States. Dept. of A