| Summary: | This paper is part of a monograph on the taxonomic determination of Scolytidae species reported from Costa Rica or potentially present in the country. The next two parts will appear in issues 2 and 3 (volume 39) of this journal. This part ¡neludes a key to all genera as well as the species of the genera Bothrosternus, Cnesinus, Chramesus, Eupagiocerus. Phloeoborus. Phloeotribus. Phrixosoma. Sternobothrus, y Xylechinus. and a key to species of Hylesine. For each species, detailed locality and host data are included. Both keys are not useful for specimens collected outside Costa Rica.
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