Abstract
Topotypic larvae of Acariscus masoni from Florida were reared to adults which proved to be Trombicula splendens known from 2 existing types from Wisconsin. The adults are typical Eutrombicula,and A. masoni is considered to be a synonym. The adults have 9-11 apical nude setae on the palpal tarsi, and a width of 55-70 [mu] between sensillae, while the closely related E. alfreddugesi have 7-8 such setae and 48-51 [mu] between sensillae. Larvae have 26 dorsal and 16 ventral setae and E. alfreddugesi 22 dorsal and 14 ventral setae. T. splendens is found in swamps, bogs, and moist places along the coastal plain from Texas to Mass., through the Great Lakes area and Miss. River valley, and is the most abundant red-bug which affects human beings in Florida. The larvae are parasitic on mammals, birds, amphibians and especially reptiles.
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