Page:The Scientific Monthly vol. 3.djvu/245

 INSECT MIGRATION

��Flo. 7. "MOSABCHH'" MHIBATINO ilflNO THE CosNECTiori Shokk. They tttlag ull from W«Lcb icit peninsula farther ti:

��drajrons first begin to drift south along our highways in mid-August smaller insect life is slill plentiful and widespread. But the same problem confronts ub in the case of many birds which begin to arrive from the north before their insect food seems to show any noticeable diminution. Yet in this we may he deceived. Certainly the insect- eating swallows are among the first to start: on the other hand, the seed and berry eaters are among the last to leave. So, whatever results more exhauEtive studies may show, the sinmltaneous early departure of dragonfliea and the birds wliieh also prey upon insect food is still another significant coincidence.

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