Monomorium noxitum

This species has been found in the leaf litter of rainforest habitats.

Identification
Bolton (1987) - Very closely related to Monomorium draxocum, the two are separated as follows:

draxocum
 * HL 0.39-0.42, HW 0.32-0.35.
 * SL 0.32-0.36 (SI 100-109).
 * AL 0.44-0.46.
 * Maximum diameter of eye 0.21-0.24 x HW, with 5-6 ommatidia in longest row.
 * Legs very pale, conspicuously much lighter than alitrunk.
 * Propodeal spiracle of moderate size.
 * Alitrunk very dark brown.

noxitum
 * HL 0.46-0.50, HW 0.37-0.40.
 * SL 0.39-0.42 (SI 103-105).
 * AL 0.54-0.58.
 * Maximum diameter of eye 0.22-0.26 x HW, with 6-7 ommatidia in longest row.
 * Legs only slightly lighter in colour than alitrunk.
 * Propodeal spiracle large.
 * Alitrunk light brown.

Distribution based on Regional Taxon Lists
Afrotropical Region: Cameroun.

Nomenclature

 *  noxitum. Monomorium noxitum Bolton, 1987: 403 (w.) CAMEROUN.

Worker
Holotype. TL 2.1, HL 0.49, HW 0.40, CI 82, SL 0.42, SI 105, PW 0.27, AL 0.56.

Answering the description of Monomorium draxocum holotype and with biconvex head as shown for Monomorium gabrielense (Fig. 76). Differing from draxocum holotype by having 7 ommatidia in the longest facet-row of the eye. The metanotal cross-ribs are much more distinct laterally than in draxocum and are not confused with the strong reticulate-punctate sculpture of the mesopleuron. Head and alitrunk brown, with blackish brown gaster; legs scarcely lighter in shade than alitrunk.

Paratypes. TL 2.0-2.1, HL 0.46-0.50, HW 0.37-0.40, CI 79-82, SL 0.39-0.42, SI 103-105, PW 0.24-0.27, AL 0.54-0.58 (8 measured). As holotype but maximum diameter of eye 0.22-0.26 x HW (0.23 x HW in holotype) and with 6-7 ommatidia in the longest row.

Type Material
Holotype worker, Cameroun: Nkoemvon, 1980 (D. Jackson). Paratypes, 8 workers with same data as holotype (BMNH; ; ).