Pheidole arachnion Wilson, 2003

Minor worker measurements (n= 1): HW 0.65, HL 0.65, SL 0.69, EL 0.10, WL 0.80, PSL 0.02, PTW 0.10, PPW 0.16, CI 100, SI 106, PSLI 303, PPI 160.

Soldier measurements (n= 1): HW 1.59, HL 1.65, SL 0.65, EL 0.14, WL 1.20, PSL 0.14, PTW 0.24, PPW 0.49, CI 96, SI 41, PSLI 8, PPI 208.

Material examined. Colombia: 1 minor worker, 2 soldiers, Caquetá, Belén de los Andaquíes, 1.6817, -75.9047, 25. Jan. 2017. Coll. D. Castro [ICN] .

Comments. Pheidole arachnion is a new record for Colombia and South America. This species was known only from Nicaragua and Costa Rica (Wilson 2003). The only studied specimen of the subcaste soldier of Pheidole arachnion from Colombia differs from those from Costa Rica by the face having a strong rugoreticulation, areolate and opaque surface, with small patches smooth and shiny between the frontal carinae.