Key to Forelius with rounded spiracles

This worker key is based on: [[Media:Fernandez F 2008b.pdf|Guerrero, R.J. & Fernández, F. 2008. A new species of the ant genus Forelius from the dry forest of Colombia. Zootaxa 1958: 51-60.]]

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Forelius

1

 * Small workers (TL 1.6–1.7 mm). Scapes barely reaching vertex margin (SI < 90). Mesosomal outline always continuous in lateral view. (Argentina, Brazil, Paraguay) . . . . . Forelius pusillus
 * Worker size variable (TL 1.4 – 2.5 mm). Scapes reaching or surpassing vertex margin by at least 1/6 of their length (SI > 90). Mesosomal outline variable . . . . . 2

2
return to couplet #1
 * Pronotum bearing only two erect setae. Dorsal face of propodeum lacking erect setae. (Colombia, Costa Rica, USA) . . . . . Forelius damiani


 * Pronotum bearing more than two erect setae. Dorsal face of propodeum bearing erect setae. Note: Some evidence of intergradation between F. pruinosus and F. mccooki (Ward 2005) suggests that F. pruinosus may contain a number of cryptic species, and may also hybridize with the very similar F. mccooki . . . . . 3

3
return to couplet #2
 * Mandibles with four teeth and three to four denticles. Pronotum usually with six erect setae. Dorsal face of mesosoma bearing more than 10 erect setae. (Jamaica, Mexico, USA) . . . . . Forelius mccooki
 * Mandibles with five teeth and one or two denticles. Pronotum usually with four erect setae. Dorsal face of mesosoma bearing 2 to 6 erect setae. (Bahamas, Colombia, Costa Rica, Cuba, Guatemala, Jamaica, Mexico, Nicaragua, Panama, USA) . . . . . Forelius pruinosus