. Elementary entomology. Insects. 238 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 (Anthomytidae) 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 cabbagre-. FIG. 378. The cabbage-m
. Elementary entomology. Insects. 238 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 (Anthomytidae) 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 cabbagre-. FIG. 378. The cabbage-maggot. (Enlarged) , pupa ; c, adult; d, head ; e, antenna. (After Riley) 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.,. 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. Boston, New York [etc. ] Ginn and Company
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