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 |
