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1.         Large, length of elytra 2.2-2.4 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D. bivittata

            Smaller, length of elytra 1.9 mm or less. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.         Elytra usually with four pale marks; if marks fuse to form two stripes,the stripes cover only             the 3rd interval at basal third; elytra 1.6-1.9 mm long. . . . . . . . . . . . . . D. quadrinotata

            Elytra with two pale stripes; if straips are broken into four spots, elytra and less than 1.5 mm             long. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D. vittata

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