Abstract
Two purines have been shown to be nitrogenous end products in arthropods, namely uric acid in insects and guanine in spiders (Prosser 1950). Blauvelt (1945) found spherical concretions in the hindgut of the two-spotted spider mite which he classed as urates. As no malpighian tubes were present, the glandular cells in the anterior lateral walls of the hindgut (plate 2, Blauvelt 1945) were described as a specialized nephritic organ for the elimination of urates. Gasser (1951), however, on the basis of solubility tests, described not only the concretions in the hindgut but also part of the black fecal pellets as containing guanine. These spherical concretions accumulate in the hindgut and are passed with the fecal pellets.
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