During the course of ACG inventory (http://www.bolinfonet.org/casestudy/index.php/display/study/20), a problem arose concerning the identity of Taygetis andromeda (Cramer, 1776), a common satyrine recorded throughout much of South and Central America and listed as such in the standard butterfly guide for Costa Rica (DeVries 1987). A high intra-specific sequence divergence was observed between two clusters of "T.andromeda" DNA barcodes - 3% compared with 0.5%, the average conspecific K2P distance reported for Lepidoptera by Hajibabaei et al. (2006; http://www.pnas.org/content/103/4/968.full). This prompted an investigation of the identity of the clusters. The deep divergence within Taygetis andromeda also initiated a broader review of the taxonomic status of other Taygetis known from Costa Rica. Of the roughly 27 species in Taygetis (Lamas 2004; http://www.ucl.ac.uk/taxome/tabd/php/taxonomy.php?family=&valid=on&subfa...), a genus in need of revision (Marin et al. 2011; http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000...), DeVries (1987) lists 11 species in Costa Rica, five of which have been reared by the ACG inventory (Janzen & Hallwachs 2010; http://janzen.sas.upenn.edu/). Our goal was to review and determine the valid scientific names for each Taygetis species for incoporation into the ACG inventory. Our findings and conclusions reflect co-operation from expert taxonomists, literature surveys, examining images of type specimens (where available; http://butterfliesofamerica.com/), study of wing characters and screening publicly available homologous DNA sequences collected from other inventories.