Other parts of the head, including the front, genae, and the central region of the clypeus, are either yellowish or yellowish brown. The head has a consistent colour pattern in large workers, with the occiput and vertex appearing brown. The legs and coxae are usually lightly shaded. The thorax is concolorous, ranging from light reddish-brown to dark-brown. The gastric spot usually covers a small portion of the first gastric tergite. Gastric spots are sometimes seen in larger workers, where they are not as brightly coloured as those in ''S. Workers appear red and somewhat yellowish with a brown or completely black gaster. Numerous appressed pubescent hairs are on the petiolar scale this is the opposite in ''S. These hairs are erect and vary in length, appearing long on each side of the pronotum and mesonotum on the head, the long hairs are seen in longitudinal rows. The pilosity appears similar to that of ''S. In some cases, punctostriae may be present around the rear portion. This gives a more opaque appearance to the surface. richteri'', the punctures are larger and more shallow. The sides are covered in deep punctures, where they appear smaller but deeper. The postpetiole, when viewed above, has a strong shagreen with distinct transverse punctostriae. On the petiole, the punctates are located on the sides. On the thorax, striae are present, but they are less engraved with fewer punctures than in ''S. The punctures are from where pilosity arises, and these are often elongated on the dorsal and ventral portions of the head. richteri'', this feature is also present but much weaker. On the rear side of the dorsal surface, a transverse impression is present. The postpetiole tends to be less broad in front and broader behind. The postpetiole is large and broad, and in the larger workers, it is broader than its length. richteri'', and sometimes it may be subtruncate. The petiole has a thick and blunt scale if observed from behind, it is not as rounded above in contrast to ''S. The suture of the promesonotum is either strong or weak in larger workers. The base and declivity are of equal length. The promesonotum is convex and the propodeum base is rounded and also convex. In the major workers, the pronotum does not have any angular shoulders, nor does it have any sunken posteromedian area. The head of small workers is wider out front than it is behind. In small and medium workers, the head tends to have more elliptical sides. In medium-sized workers, the scapes reach the occipital peaks and exceed the rear border in the smallest workers. The scapes in major workers do not extend beyond occipital peak by one or two scape diameters this feature is more noticeable in ''S. richteri'', the lobes peak further than the midline, but the occipital excision is not as crease-like. The head becomes wider behind the eyes with rounded occipital lobes present, and unlike the similar-looking ''S. The antenna scapes measure 0.96 to 1.02 mm and the thoracic length is 1.70 to 1.73 mm.
In the larger workers, their heads measure 1.35 to 1.40 mm and 1.39 to 1.42 mm wide. The head measures 0.66 to 1.41 mm and is 0.65 to 1.43 mm wide. Red imported fire ant workers range in size from small to medium, making them polymorphic.
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