Abstract
The identification of carotin as the chief cause of the red and yellow hypodermal colors seen in the predaceous stinkbug Perillus bioculatus (Fab.), reported in the preceding abstract, suggested an examination of the red pigment of other Hemiptera. It was found that red pigment in phytophagous and predaceous families of this order of insects is not limited to one type of substance. Water-soluble pigments appear to be more common than carotin. The aphid (Tritogenaphis rudbeckiae, Fitch) owes its vermilion color chiefly to an anthocyanin-like pigment, although small quantities of carotin also occur in the bug. On the other hand the red color of the red and black patterned phytophagous box-elder plant-bug (Leptocoris trivitatus, Say), the milk-weed plant-bug (Lygaeus kalmii, Stal), the bladder-nut plant-bug (Lopidea staphyleae sanguinea, Kngt.), the maple plant-bug (Coccobaphes sanguinareus, Uhler), and the predaceous Assassin-bug (Eulyes illustris, Stal) is due to a flavone-like pigment.
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