. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN U. S. DEPAKTMENT OF AGRICULTUEB. writer's mind that if the types of all of the early described species now referred to synonymy were in existence to-day and were recog- nizable, vaginicola would be found among them. H. vaginicola was very probably confused with hordei and secalis as well as tritici. The writer's earliest personal records of vaginicola are from col- lections from eastern Ohio in 1912. Since then he has recorded it from Michigan, New York, and Pennsylvania and has been rearing it in confine-
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN U. S. DEPAKTMENT OF AGRICULTUEB. writer's mind that if the types of all of the early described species now referred to synonymy were in existence to-day and were recog- nizable, vaginicola would be found among them. H. vaginicola was very probably confused with hordei and secalis as well as tritici. The writer's earliest personal records of vaginicola are from col- lections from eastern Ohio in 1912. Since then he has recorded it from Michigan, New York, and Pennsylvania and has been rearing it in confine- ment since 1914. Mr. Desla Bennion sent the writer specimens from Salt Lake as early as 1914 and Mr. L. P. Eockwood recently submitted a single gall from Oregon, from which this species has emerged. MANNEE OF INJTOBY. H. vaginicola affects the plants in a very peculiar way, and only one other species, namely, atlantica, a gall-former in Agrop'i/- ron sp., is known to the writer to affect a plant in a similar manner. The eggs (fig. 8, a) are depos- ited in the tender leaf sheath surrounding the embryonic head. It does not seem possible that the insect can always locate .this delicate structure so easily. The result is that as the plant grows, the leaf sheath surrounding the developing head becomes fleshy and thick instead of remaining thin and leaflike. Later this thick- ened, fleshy leaf becomes hard and woody and compresses the stem to such an extent that little or no sap can reach the develop- ing head. Consequently the head usually protrudes only an inch or. Tig. —Eggs of species of Ilarmolita : a, H. vagini- cola j hjH. secalis; o, H. elymicolaj d,H. maculataj e, H. poae. All greatly enlarged. (Original.). 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 United States. Dept. of Agriculture. [Washingt
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