. The bagworm. (Thyridopteryx ephemeraeformis Haw.). re subject to fluctuation in num-bers. It is, however, more limited in distributionand not found as a rule north of southern New Yorkand the central portions of Pennsylvania and of these points it is in certain years very trou-blesome and the subject of much complaint. Such ayear was 1907, when the bagworm attracted greaterattention than any other tree defoliator. Numerouscomplaints were received of injuries in the regionmentioned, and especially from the States of NewJersey, Pennsylvania, Maryland, Virginia, West Virginia, Ohio,I
. The bagworm. (Thyridopteryx ephemeraeformis Haw.). re subject to fluctuation in num-bers. It is, however, more limited in distributionand not found as a rule north of southern New Yorkand the central portions of Pennsylvania and of these points it is in certain years very trou-blesome and the subject of much complaint. Such ayear was 1907, when the bagworm attracted greaterattention than any other tree defoliator. Numerouscomplaints were received of injuries in the regionmentioned, and especially from the States of NewJersey, Pennsylvania, Maryland, Virginia, West Virginia, Ohio,Indiana, and Illinois. The natural enemies of this insect (see p. 6)were comparatively scarce, and there is a strong possibility of a recur-rence of injuries in the years to come. The general appearance of the bagworm is shown in figure 1, whichillustrates the caterpillar when nearly full grown, in its characteristicbag. When removed from its bag it looks as shown in figure 2, a,which represents the larva maturity. At this period in its develop-. Fig. 1.—Bagworm( Thyridopteryxephemerseformis).Natural size (af-ter Riley). a Hemerocampa leucostigma S. & —Cir. 97—08 1 & Hyphantria cunea Dru. 2 ment it may attain a length of about three-fourths of an inch. Thebody is soft in texture and dull brownish or blackish, while the headand thoracic segments are horny and whitish, mottled with darkbrown. ORIGINAL HOME AND PRESENT DISTRIBUTION. The bagworm is unquestionably native to North America. Itabounds in the Southern States, and its proper home—that is to say,the part of the country where it reaches its maximum—is in the LowerAustral life zone. It extends through a considerable portion of theUpper Austral zone, but there are indications that it has graduallyspread into this territory from more southern The shadetrees of Baltimore, Washington, St. Louis, and other more southerncities are frequently defoliated by this insect. Northward it occurs
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