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The following paper is an attempt to homologize the wing-veins of May-flies by a study of the tracheæ which precede them in the nymphal wing-pad. The venation of May-flies has been many times discussed but only one work, that of the well known “Wings of Insects” by Comstock and Needham, has approached it from the stand-point of tracheation. This work suggested the present study.
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Anna H. Morgan (1912) studied this question.
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