. Circular. Insects. 12 America represented by Polygnotus hiemalis haps the most useful of any in this Forbes (fig. 11), per- It is very minute, and Mr. Reeves has count- ed over forty of the larvae within a single flaxseed. It is black, with yellow feet, and the legs are dark brown, banded with yellow. The writer has again and again reared this in great numbers from fall wheat infested by the fly and witnessed the sudden check sus- tained b}T the pest the Fig. 11.—Polygnotus hiemalis, much enlarged (original). following Spring It is owing to this more than to any other influence tha
. Circular. Insects. 12 America represented by Polygnotus hiemalis haps the most useful of any in this Forbes (fig. 11), per- It is very minute, and Mr. Reeves has count- ed over forty of the larvae within a single flaxseed. It is black, with yellow feet, and the legs are dark brown, banded with yellow. The writer has again and again reared this in great numbers from fall wheat infested by the fly and witnessed the sudden check sus- tained b}T the pest the Fig. 11.—Polygnotus hiemalis, much enlarged (original). following Spring It is owing to this more than to any other influence that the Hessian fly is now being held in check in the spring wheat regions of the North- west. Perhaps the next most useful parasite is Eupelmus ally nil French (figs. 12, male, and 13, female). This is generally distributed over the country and affects both the Hessian fty and the joint-worm. It is larger than the preceding; the bod}^ is black, with a greenish luster, and the legs are more or less yellow. Merisus destructor Say (fig. 11) occurs in Europe, England, and America, but not in such profusion with us as to afford the same relief to the farmer as in the case of the two preceding. It also is black, but with a bluish green metallic reflection, and the legs are black-, banded with yel- low. Platygaster herrickh Pack, (fig. 15) is very minute, shining black in color, and is supposed by many to attack the egg of the fly, but there is still some doubt regarding this. Bceotomus sub- apterus Riley (fig. 10), as the name implies, lias aborted wings ire fully winged. The head and metallic luster, and the leo-s honey-. 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. Bureau of Entomology. Washington, Govt. print. off.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectinsects
