"It was not possible for us to calculate what proportion of these winged ants were carried by the wind too far to return to their old home; but certainly a large proportion were caught by the surrounding trees; and we found, on search, some of these crawling down the trunks of the trees, with their wings in a damaged condition. How near the trees must be for them to reach their old home, we should like to learn; and what tells them, 'which road to take?' Dr. Duncan states,[34] 'It was formerly supposed that the females which alighted at a great distance from their old nests returned again, but Huber, having great doubts upon this subject, found that some of them, after having left the males, fell on to the ground in out-of-the-way places, whence they could not possibly return to the original nest!' We unfortunately did not note the sex of those individuals that we intercepted in their return (?) trip; but we can not help expressing our belief that, at least in this case, there was scarcely an appreciable amount of 'returning' on the part of those whose exodus we have just described; although so many were caught by the nearer trees and shrubbery. Is it probable that these insects could find their way to a small underground nest, where there was no 'travel' in the vicinity, other than the steady departure of individuals, who, like themselves, were terribly bothered with the wings they were carrying about with them?" (_American Naturalist._) We have noticed that those females that do not return to the old nest found new ones. In Maine and Massachusetts we have for several successive years noticed the swarming of certain species of ants during an unusually warm and sultry day early in September. The autumnal brood of Plant lice now occur in great numbers on various plants. The last brood, however, does not consist exclusively of males and females, for of some of the wingless individuals previously supposed to be perfect insects of both sexes, Dr. W. I. Burnett found that many were in reality of the ordinary gemmiparous form, such as those composing the early summer broods. The White Pine Plant lice (Lachnus strobi) may be seen laying their long string of black oval eggs on the needles of the pine. They are accompanied by hosts of two-winged flies, Ichneumons, and in the night by many moths which feed on the Aphis-honey they secrete, and which drops upon the leaves beneath. FOOTNOTES: [Footnote 30: The right side represents the under side of the wings.] [Footnote [Footnote 32: See "Proceedings of the Essex Institute," vol. iv, p. 105.] [Footnote 33: Naturalist on the River Amazons, vol. 1, p. 32.] [Footnote 34: Transformations of Insects, p. 205.] INDEX. Abraxas ribearia, 202. Acarus, 124. Acceleration, theory of evolution by, 167. Achorutes, 145. Adela, 189. Agrion, 109. Agrion, egg-parasite of, 164. Agrotis, 197. Alternation of generations, 168. Alypia, 57, 197. American tent caterpillar, 187.