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[Brief letters to the Editor that make specific scientific reference to papers published previously in THE JOtrRNAL OF GENERAL PHWSIOLOOY are invited. Receipt of such letters will be acknowledged, and those containing pertinent scientific comments and scientific criticisms will be published.] Dear Sir: The recent article entitled "Do Flies Have a Red Receptor?" by Goldsmith (1) answers this question very nicely in the negative. Further support for this conclusion is now available, as described below.

Absorption of Musca domestica Screening Pigment