. Elementary entomology. Entomology. 2 38 ELEMENTARY ENTOMOLOGY The tachina-flies are among our most beneficial insects, their white eggs being commonly found on the necks of caterpillars and grasshoppers, the flies appearing in large num- bers whenever there is an outbreak of such caterpillars as the army- worm. Root-maggot flies (Anthomyiidae) are an- other group of trouble- some flies belonging to this series, many of whose larvae are serious pests of the roots of vegeta- bles. The flies somewhat resemble house-flies, but are smaller and slighter in build. The cabbage- maggot and onion-magg
. Elementary entomology. Entomology. 2 38 ELEMENTARY ENTOMOLOGY The tachina-flies are among our most beneficial insects, their white eggs being commonly found on the necks of caterpillars and grasshoppers, the flies appearing in large num- bers whenever there is an outbreak of such caterpillars as the army- worm. Root-maggot flies (Anthomyiidae) are an- other group of trouble- some flies belonging to this series, many of whose larvae are serious pests of the roots of vegeta- bles. The flies somewhat resemble house-flies, but are smaller and slighter in build. The cabbage- maggot and onion-maggot are well-known examples of these inju- rious larvae, and wherever small flies are seen hovering around these or other root crops, such as radishes, turnips, beets, etc.,. Fig. 378. The cabbage-maggot. (Enlarged) a, larva ; /', pupa ; c, adult; d, head ; c, antenna. (After Riley). 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 Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882; Metcalf Collection (North Carolina State University). NCRS. Boston, Ginn
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
