. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. GENERAL RANGE OF SPECIES AND RACES, 37 Transition zone. The overla]:)ping of the two races, discussed else- where, is well illustrated by these two maps. The range of the individual broods is undoubtedly much (greater than the limits now assio;ned, since the records until recent years hav<j been largely based on notable and dense swarms and have rarely taken into account the scattering individuals, which undoubt- edly extend over a much greater territory and usually pass unno- ticed. The very careful records s
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. GENERAL RANGE OF SPECIES AND RACES, 37 Transition zone. The overla]:)ping of the two races, discussed else- where, is well illustrated by these two maps. The range of the individual broods is undoubtedly much (greater than the limits now assio;ned, since the records until recent years hav<j been largely based on notable and dense swarms and have rarely taken into account the scattering individuals, which undoubt- edly extend over a much greater territory and usually pass unno- ticed. The very careful records secured of the broods, including and subsequent to 1898, have shown much of this scattering occurrence beyond the denser brood limits, as will be seen in the maps illus- trating these broods. This indicates that the breaking up of the. Fig. .3.—Map showing distribution of tiie broods of tho 17-yoar race. Cicada has already gone much farther than was hitherto supposed, and points to the ultimate disappearance of great broods as such and their replacement as scattering individuals every year. The dis- appearance of the great broods, however, is not to be anticipated in the very near future, and may not come about for a thousand or even several thousand years. This is shown by the fact that the broods first seen by the early colonists in New England on Cape Cod, at Plymouth, and on Marthas Vineyard are, as elsewhere noted, still practically unreduced in numbers and make just as startling an impression as ever. This is due to the fact that much woodland remains undisturbed hx these localities. In other places, where the woods have been largely removed as the result of settlement, the Cicada has correspondingly 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. Was
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