Annual report of the Regents . 8, p. 31 (of broods v and x in 1888), p. 298 (distribution of brood viii in 1889), p. 324 (precursors of brood viii).McNeal : in Insect Life, i, 1888, p. 50 (precursors in 1888 of brood v).MuRTFELDT \ in Kept. Commis. Agricul. for 1888, p. 135 (trees killed in Illinois).Barlow : in Insect Life, iiy 1889, p. 342 (larva in its gallery).March : in Rept. Commis. Agricul. for 1889, p. 218 (food, injuries, enemies).Webster : in Insect Life, ii, 1889, p. 161 (brood ?viii in the 17th century).ScHWARz: in Proc. Ent. Soc. Wash., 1889, pp. 230, 248 (of brood viii near Washi
Annual report of the Regents . 8, p. 31 (of broods v and x in 1888), p. 298 (distribution of brood viii in 1889), p. 324 (precursors of brood viii).McNeal : in Insect Life, i, 1888, p. 50 (precursors in 1888 of brood v).MuRTFELDT \ in Kept. Commis. Agricul. for 1888, p. 135 (trees killed in Illinois).Barlow : in Insect Life, iiy 1889, p. 342 (larva in its gallery).March : in Rept. Commis. Agricul. for 1889, p. 218 (food, injuries, enemies).Webster : in Insect Life, ii, 1889, p. 161 (brood ?viii in the 17th century).ScHWARz: in Proc. Ent. Soc. Wash., 1889, pp. 230, 248 (of brood viii near Washington).(The above are additional to the references given in the 2d Rept. Ins. N. Y., 1883.) The regular appearance of the successive broods of this remarkableinsect at the long intervals of seventeen years — the longest life-periodof any known species — has been fully established, and the limitsof the twenty-two broods that occur throughout the United Stateshave been approximately ascertained and mapped. Of these, six only.
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