. Annals of the Entomological Society of America. Entomology. ANNALS OF The Entomological Society of America Volume 11 JUNE. 1909 Number 2 INVESTIGATIONS OF TOXOPTERA GRAMINUM AND ITS PARASITES. By F. M. Webster, bureau of entomology, washington, d. c. This minute insect (see figS. i, 2), aside from its economic importance, which, by the way, is very great, has become the basis of a long series of thorough investigations, carried out by several assistants of the Bureau of Entomology, under my direc- tion. My own studies of the species were made largely during the years 1884 to 1890, while empl
. Annals of the Entomological Society of America. Entomology. ANNALS OF The Entomological Society of America Volume 11 JUNE. 1909 Number 2 INVESTIGATIONS OF TOXOPTERA GRAMINUM AND ITS PARASITES. By F. M. Webster, bureau of entomology, washington, d. c. This minute insect (see figS. i, 2), aside from its economic importance, which, by the way, is very great, has become the basis of a long series of thorough investigations, carried out by several assistants of the Bureau of Entomology, under my direc- tion. My own studies of the species were made largely during the years 1884 to 1890, while employed by the old Division of Entomology. As the subject of this paper may not be familiar to all entomologists it will be better to begin, historically at least, with our first knowledge of the species in its native country, if, indeed, we might with our present information, be allowed to designate for it a place of a Fig. 1.—The spring grain-aphis (Toxoptera graminum): a, Winged migrant viviparous female; 6, antenna of same. a, Much enlarged; b, highly magnified. (From Pergande.) 67. 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 Entomological Society of America. [College Park, Md. , etc. ] : Entomological Society of America
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