. Memoirs and proceedings of the Manchester Literary & Philosophical Society. 4 I. I &&* i^2J1. I » -A /F. //. L. Photo. Manchester Memoirs, Vol. lix. (1915), No. i>. IX. On two cases of Parallelism in the Aphidae. By A. W. Rymer Roberts, (Received and read March 23rd, 19/5.) The existence of parallel races of insects, having acommon ancestry, but differing in their habits, and some-times also in their external morphology, was brought intoprominence by Blochmann, Dreyfus and Cholodkovsky (I)in the course of their early researches into the biology of theChermesince, especially Chermes a
. Memoirs and proceedings of the Manchester Literary & Philosophical Society. 4 I. I &&* i^2J1. I » -A /F. //. L. Photo. Manchester Memoirs, Vol. lix. (1915), No. i>. IX. On two cases of Parallelism in the Aphidae. By A. W. Rymer Roberts, (Received and read March 23rd, 19/5.) The existence of parallel races of insects, having acommon ancestry, but differing in their habits, and some-times also in their external morphology, was brought intoprominence by Blochmann, Dreyfus and Cholodkovsky (I)in the course of their early researches into the biology of theChermesince, especially Chermes abietis and Oh. that time—the closing years of the last century—adoubt has arisen as to whether the races of Chermes whichwere then considered as forming the most prominentexamples of the phenomenon, the moncecious anddioecious forms, ought properly to be regarded as parallelraces, rather than as biological species which have evolvedand are maintaining a different life-history. Cholodkov-sky (2) has more recently given different specific namesto the moncecious and dio
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1888
