. The American entomologist. Entomology. 152 THE AMERICAN ENTOMOLOGIST. fly which came forth thus was the true Joint- worm Fly.* As ah'eady shown, the flies that emerged from these Canada galls iu the suc- ceeding summer, came out from Jnne 0th to June IGtIi and subsequently. Parasites of the Joint-worm. On cutting open a great number of the cells of the dry barley-galls, obtained from Canada in September, we found in one of them a small stout parasitic larva, of a pale glaucous color, attached externally, in the manner common with the larva? of many Chalcis flies, to the half-dead and blacken
. The American entomologist. Entomology. 152 THE AMERICAN ENTOMOLOGIST. fly which came forth thus was the true Joint- worm Fly.* As ah'eady shown, the flies that emerged from these Canada galls iu the suc- ceeding summer, came out from Jnne 0th to June IGtIi and subsequently. Parasites of the Joint-worm. On cutting open a great number of the cells of the dry barley-galls, obtained from Canada in September, we found in one of them a small stout parasitic larva, of a pale glaucous color, attached externally, in the manner common with the larva? of many Chalcis flies, to the half-dead and blackened and partially shrunken carcass of one of the true gall-making Joint- worms. In another cell we found a much larger parasitic larva, evidently belonging to the same species, which had apparently devoured entirely the body of its victim. And from the body of .still another Joint-worm, wounded by accident in opening the cell, but which was neither shrunken nor discolored, there emerged under our very eyes a third parasitic lan-a, of medium size, and apparently belonging to the same spe- cies as the two just now referred to. Thus it would seem that in the earlier stages of its ex- istence this parasite is an external feeder, but subsequently penetrates inside the body of its victim after the more usual fashion in such cases. In the summer of the succeeding year, we bred 1^1 sjiecimens of what is evidently the perfect fly of this same parasitic larva, from the same lot of barley-galls in which we found the above throe parasitic laiTW, and from which we reared such hosts of the true Joint-worm Fly. Out of this lot of galls, 17 male parasites came out from June 11th to 22nd, and 14 female para- sites from June 1-ith to 28th, thus showing that in this species also the males appear several days on the average before the females. Below we give figures of both sexes of this insect, which is an entirely new and undescribed spe- cies, and which we have called " The Chalcis- 114 ]. C
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