the mandibles, M. regularis workers measure , with the mandibles measuring . Including the mandibles, workers measure , queens are and males are . These ants are bright brownish-red in colour, with brown legs and scapes, and a black gaster. The whole of the head and thorax is a bright mahogany red, while the mandibles are shaded with brown. The hair is yellow, moderately long, erect and found all over the body, but the hairs are shorter on the legs and absent on the antennae. The pubescence (soft short hair) is confined to the clypeus. The queen shares the same colour variation, body sculpture and pilosity of a worker, but they are usually larger. Queens show reduced thoracic development, and Clark described them as "subapterous", suggesting that wings are present in the females as undifferentiated wing buds. However, queens collected from Manjimup bore well developed wings. The head, epinotum, mesonotum and pronotum are finely striate-rugose. The head is as long as it is broad with a straight occipital border. The mandibles are slightly shorter than the head with a concave border. The pronotum is broader than its total length by one-third and the mesonotum is broader by one-sixth, being almost circular in shape and clearly convex. The epinotum is also broader, but only slightly. The gaster is slightly broader, and the postpetiole is one-fifth broader than long. The scutellum is oval and almost twice as broad as long. Male specimens have been rarely collected, and those that are available are too badly damaged for a proper examination. However, the colour and pilosity of male and worker specimens show little differentiation. The heads of the workers and queens are as long as broad with convexed sides. The mandibles are long with thirteen known teeth. The first and third segments of the funiculus are equally long. The thorax is longer than broad by two to three-fourths its width, and the mesonotum is longer than it is broad in workers; the mesonotum is broader than it is long in queens. The node (a segment between the mesosoma and gaster) is as long as it is broad, and the postpetiole is one-sixth broader than long. The first segment of the gaster is broader than its length. M. regularis shares a similar appearance to M. forficata, but there are several morphological differences that separate the two. Owing to the rugose sculpture of the head and