Longino, J. T., 2006, A taxonomic review of the genus Myrmelachista (Hymenoptera: Formicidae) in Costa Rica., Zootaxa 1141, pp. 1-54: 51

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[[ Genus Myrmelachista  HNS  ]]

The above are a set of species described together by Wheeler from material collected by Elisabeth Skwarra in southern Mexico. They are all very similar to plebecula  HNS  and joycei  HNS  . I cannot distinguish workers of amicta  HNS  , skwarrae  HNS  (and its two subspecies picea  HNS  and laeta  HNS  ), and plebecula  HNS  . The males of skwarrae  HNS  and plebecula  HNS  are distinct. The male of skwarrae  HNS  differs from plebecula  HNS  in having a basiparamere lobe and distinct (though minute) setose pygostyles. Myrmelachista skwarrae  HNS  males are more like joycei  HNS  . They differ from joycei  HNS  in the relatively thinner and more delicate basiparamere lobe and relatively larger ocelli.

If the Mexican forms prove to be geographic variants of plebecula  HNS  , the latter has priority. On the other hand, M. joycei  HNS  could prove to be a geographic variant of one of the previously named Mexican forms.