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��THE SCIENTIFIC MONTHLY

��inland. Other scattered flights have been seen in the streets of Wash- ington. But whether these are all isolated occurrence or bands mov- ing from the interior remains to be discovered. However, the great "resting swarms" reported at Charleston Harbor, South Carolina, show that many of the insects either preserve, or else recover, tlieii coastwise habit, and persist in this extensive, continental flightvay,

���Fig. 1. Autumn Insect Routes to the South. At least four sri'eat fligl ways are defined, (1) by the Atlantic Coast, (2) and (3) by the Great Lakes, and ( by the West Central States. The great sulphur's Inland fllgjits In the Soutb se to move on a broader front except In the Ozark Mountains. (Map from the U. Geological Survey.)

whose further course, or possible termination, remains to be defiiK Farther west, along the northern shores of Lake Ontario and T^ Erie, another great route must exist, even though no flights hai^e hi reported as moving in that general direction. This flight-line 'was fi suggested by reason of the steady, uninterrupted streams of *^ m archs" reported by the bird student, Tavemer, as coming down fi the north, and then flying along Point Pelee, a peninsula jutting sov

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