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TABLE 1. Morphological comparison between Forelius chenpauch sp. nov. and the other Forelius species with a rounded spiracle present in the New World.

Taxon/Character Scape length Mandibular dentition Hairs on the mesosoma Mesosoma profile
Forelius chenpauch sp. nov. Reaching the posterior margin of the head (SI= 0.83) Six teeth and no denticles Six on the pronotum, mesonotum with four erect hairs, and propodeum with four erect ones. Discontinuous, promesonotum convex, differentiated from the anterior face of the propodeum
Forelius antarcticus (Forel, 1904) Exceeding the posterior margin of the head capsule (SI = 0.98-1.04) Five teeth and no denticles Two on the pronotum, no erect hairs elsewhere on mesosoma Discontinuous, promesonotum almost continuous, slightly differentiated from the anterior face of the propodeum
Forelius damiani Guerrero and Fernández, 2008 Short, reaching posterior margin of head (SI= 0.95 - 1.32) Four teeth and two denticles Two on the pronotum, no erect hairs elsewhere on mesosoma Straight, pronotum in profile relatively low and flat
Forelius heyeri (Forel, 1902) Short, well below or barely reaching the posterior cephalic margin by a length less than the width of the pedicel (SI= 0.8 - 0.91). Five teeth and no denticles Two on the pronotum, no erect hairs elsewhere on mesosoma Continuous, slightly flat; promesonotum continuous and slightly differentiated from the propodeum
Forelius keiferi Wheeler, 1934 Exceeding the posterior cephalic margin by 1/5 of its length (SI= 0.98 - 1.05) Five teeth and one denticle Two to three on the pronotum Discontinuous, strongly convex promesonotum differentiated from anterior face of propodeum
Forelius mccooki (McCook, 1880) Exceeding the posterior cephalic margin by 1/5 of its length (SI= 0.98 - 1.05) Four teeth and three to four denticles Pronotum usually with six erect setae, rest of mesosomal dorsum with bearing more than 10 erect setae Continuous, promesonotum continuous and slightly differentiated from anterior face of propodeum
Forelius pruinosus (Roger, 1863) Exceeding the posterior cephalic margin by 1/5 of its length (SI= 1.07 - 1.14) Five teeth and one or two denticles Pronotum usually with four erect setae, rest of mesosomal dorsum with bearing 2 to 6 erect setae Discontinuous, strongly convex promesonotum differentiated from strongly convex propodeum

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