Adlerzia froggatti

An infrequently collected species that we known little about. They nest under stones as well as in the soil without coverings.

Identification
The antennae are 11 segmented. The upper surface of the head is smooth and there are no antennal scrobes. The front margin of the clypeus just above the mandibles has pairs of elongate hairs or setae which straddle the mid-line of the head but there are no central hairs. The clypeus has a pair of longitudinal ridges or sharp angles immediately below the antennal sockets which separate the central region from the lateral regions (clypeus longitudinally bicarinate). The petiole has a distinct, rounded node. There are major and minor workers but no intermediates (dimorphic).

These ants are most likely to be confused with species of Anisopheidole, Machomyrma or possibly Pheidole because of the generally similar body size and shape and the presence of major workers. They can be separated by their 11 segmented antennae and bicarinate clypeus.

Distribution
This taxon is known only from Australia.

Habitat
Known from wet and dry sclerophyll habitats and Eucalypt forest.

Abundance
Rarely encountered.

Castes
= Adlerzia froggatti has polymorphic workers.



Minor worker of A. froggatti from New South Wales.



Medium worker of A. froggatti from New South Wales.



Major worker of A. froggatti from New South Wales.

Nomenclature
Adlerzia froggatti type material

Holotype minor worker from Bendigo, Victoria.

Machomyrma silvestrii type material

Type Material Holotype worker from Mt. Lofty, Adelaide, South Australia.

Stenothorax katerinae type material

Holotype worker and 2 paratype workers from Greensborough, Victoria.

Worker
The following is McAreavey's description of Stenothorax katerinae (McAreavey 1949), which is a synonym of this species. Worker minor. Length 3 mm. Uniformly light reddish brown with the legs slightly paler. Mandibles smooth and shining; clypeus and the space between the frontal carinae faintly shagreened; head including the flattened frontal carinae longitudinally finely rugose with the spaces between the rugae smooth and shining; pronotum finely rugose. the rugae having a circular direction, the spaces smooth and shining; epinotum faintly sculptured, microscopically reticulate-punctate; sides of pronotum transversely striate; sides of rest of thorax and the whole of the stalk microscopically reticulate-punctate; petiole, postpetiole and gaster very faintly shagreened; legs smooth.

Hair golden, long, erect on head and body, suberect on legs, abundant but never hiding the sculpture. Pubescence paler and confined to funiculus, tibiae and tarsi.

Head without the mandibles square; with the sides and the occipital border almost straight, the corners rounded; mandibles large triangular, with six strong teeth, the apical three being stronger than the other three; clypeus narrow with anterior border rounded. There is a faint depression at the centre of the anterior border. Frontal carinae broadly flattened, forming two lobes that overhang the clypeus, Between the lobes is a deep rectangular groove, twice as long as broad. The scapes extend to the posterior quarter of the head, and are not thickened; llrst se~ment of the funiculus almost as long as the foul' following, second to sixth broader than long, seventh longer than broad, the three following segments form a distinct club, of which the apical segment is as long as the two preceding together; eyes very small, placed just behind the middle of the sides of the head.

Thorax twice as long as broad and has no sutures; pro-mesonotum large, longer than broad, in front slightly narrower than the head and tapering away to a point behind, the anterior border rounded and without marked corners. The small area between the pro-mesonotum and the epinotum strongly depressed, from this arises the peculiar epinotum. It is wedge-shaped, and the dorsum is concave, so that it is difficult to say where it emerges into the epinotal declivity. At its broadest part it is less than half as broad as the pro-mesonotum. The lateral borders are sharp so that from certain angles the posterior corners seem to be sharp. In profile the pro-mesonotum is strongly convex, flattened slightly at the middle. There is a very small raised metanotum which is not noticeable in the dorsal view. The epinotum is low, with the dorsum straight and sloping into the slightly shorter and feebly concave declivity. The stalk is long and narrow; petiole almost square, slightly narrower in front than behind, the anterior angles rounded, the sides and posterior border straight. There is hardly any stalk between the petiole and postpetiole. The postpetiole is larger than the petiole, square, with the faces straight and the corners rounded. In profile the petiole is higher than the postpetiole, as high as long, with the anterior face feebly convex, dorsum sharply convex, and the posterior face straight. The postpetiole is dome-shaped. Gaster ovate. Legs short, robust, with femora and tibiae slightly thickened.

Worker major Length 3.8 mm. Head reddish brown with the area around the ocelli very dark, almost black; mandibles except for the reddish tips, antennae reddish brown, thorax light reddish yellow with the legs pale yellow; petiole and postpetiole brownish yellow and the gaster dull yellow. Hair golden, long, erect on body and suberect on legs, abundant throughout, but not hiding the sculpture. Pubescence pale, confined to funiculus, tibiae and tarsi.

Mandibles smooth with a few faint striae. Rest of the sculpture as in the worker but the circular rugae on the pronotum are more pronounced, and the punctuation on the epinotum very clear. The anterior coxae have a few longitudinal ridges, and the sides of the petiole are densely and microscopically reticulate punctate.

Head almost square with almost straight occipital border and feebly convex sides; clypeus not notched at the centre, and not overhanging the mandibles; mandibles as in worker; frontal carinae as in worker, but not extending back quite so far; antennae as in worker, but the scapes slightly thickened, extending as far as the posterior border of the eyes; eyes very large, hemispherical, and placed at the centre of the sides of the head. There are two very distinct ocelli but no trace of a third, nor even a pit for an ocellus.

Thorax is very similar to that of the worker, and has no sutures of any kind. In profile the pro-mesonotum appears to be flatter, the small metanotum is hardly visible, the dorsum of the epinotum is not so sloping. The petiole and postpetiole are very similar to those of the worker. In profile they are almost the same size, the anterior face and dorsum of the petiole form almost a single convexity. Rest as in worker.

Additional References

 * Brown, W. L., Jr. (1952). Adlerzia froggatti Forel and some new synonymy (Hymenoptera: Formicidae). Psyche (Cambridge), 58: 110.
 * Emery, C. (1914). Formiche d'Australia e di Samoa raccolte dal Prof. Silvestri nel 1913. Bollettino del Laboratorio di Zoologia Generale e Agraria della Reale Scoula Superiore d'Agricoltura. Portici, 8: 179–186.
 * Forel, A. (1902). Fourmis nouvelles d'Australie. Revue Suisse de Zoologie, 10: 405–548.
 * McAreavey, J. (1949). Australian Formicidae. New genera and species. Proceedings of the Linnean Society of New South Wales, 74: 1-25.