Paxillus MacLeay, 1819 can be recognized by anterior angles of clypeus, in dorsal view, not visible, very reduced, completely under the frons; external tubercles with an acute apex, directed downwards; prosternal process always pentagonal; metasternal
disc glabrous and wholly delimited (Reyes-Castillo, 1973).
The prosternal plate has three setae, and the metasternal
plate nine to thirteen setae.
plate middle-sized, fusiform shaped, with one pair of setae St4 (80-85).
28 and 29), of meso- and metasternal
A2 = 1 [micro]m (Figs.
Prosternai spines are delicate and short (shorter than the clypeus hornlets), mesosternal lobes are pointed and erected, metasternal
ones broadly rounded, and the metasternal
pit is transverse, short, and deep (divided by a thin medial ridge).
Meso and metasternal
lobes elongate, divided by acute notch, pointed apically.
palmyra for the present, because they possess the distinctively concave posterior metasternum, a small and bidentate posteromedial metasternal
process, and a basally incised fore tibia, but have not designated them as paratypes because of the significant geographic distance separating the two populations, which suggests that the Pagan population may eventually prove to be a distinct species once additional material is available for a more detailed evaluation.
spinifer Percheron differ by having large, circular, deep and scored mesoesternal fossae; the metasternal
disc is delimited by spaced punctuations not detached to the sides, while P.
process strongly convex in lateral view.