Genus Alloscopus Börner, 1906

Diagnosis. Specimens usually unpigmented, eyepatches black, if present. Apically rounded or truncate scales present, as in other Heteromurini . Antennae generally five-segmented (rarely six-segmented), with Ant. I basally subdivided, proximal subarticle smaller than the distal one, Ant. IV annulated, Ant. III annulated or normal. Postantennal organ present. Eyes 3+3 to 0+0. Prelabral chaetae not bifurcate. Post-labial quadrangle (anterior chaetae surrounding the cephalic groove) chaetae smooth or ciliate. Dorsal head with S0 mac, A1 and S2 absent, posterior head with only Pa5 mac, if present, Abd. I with 2+2 or 3+3 mac (more commonly), Abd. V with three sens. Unguis with a single outer tooth. Manubrium with rows of smooth chaetae, dental spines present and simple. Mucronal spine present or absent (adapted from Mari-Mutt 1977; Cipola et al. 2016; Zhang et al. 2020).

Remarks. More details on the genus are discussed in Cipola et al. (2016) and Zhang et al. (2020). We added a note on the subsegmentation of the antennae, rarely six-segmented, following the observation of Yoshii & Suhardjono (1989, p. 67) on the antennae of A. tenuicornis Börner, 1906, which often presents an Ant. II subdivided.