The New World species ofTrissolcus, exclusive of the flavipes and thyantae species groups, are revised. This encompasses seven species:T. basalis(Wollaston) recorded in the southeastern USA, West Indies, Venezuela, and southeastern Brazil;T. cosmopeplae(Gahan) from the USA and Canada;T. erugatusn. sp. from the western USA and Canada;T. hullensis(Harrington) widely distributed throughout Canada, USA, Mexico, Dominica, and Venezuela;T. radixn. sp. from Guatemala, Costa Rica, Colombia, Venezuela, and the southeastern USA;T. solocisn. sp. from Mexico and the southeastern USA; andT. utahensis(Ashmead) from the western USA and Canada. Available host information for each species is summarized. These species are described and an identification key is provided.
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Norman F. Johnson (1985) studied this question.
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