*ater (Gervais, 1844)
*buski (Lubbock, 1862)
Allacma fuscais a widespread and common species found in a variety of moist habitats near to the ground surface. It is a large dark brown springtail reaching 3.5 mm in length (Fig. 1). The fourth antennal segment (ant4) is divided into 16 subsegments. Some setae on the third antennal segment (ant3) are longer than others (Fig. 2). The outer edge of the mucro is smooth and the inner edge is serrated (Figs. 3, 4). The female sub-anal appendages (SAA) are not branched at the tip (Fig. 5). The empodium on the foot is longer than the claw which is encased in a sheath (Fig. 6). A small post-antennal organ (PAO) is present (Fig. 7).