On the genus Paccius (Araneae, Trachelidae) in Madagascar: two new species, redescriptions, and a key to the species

The Malagasy and Seychellois endemic dark sac spider genus Paccius Simon, 1898 is a putatively highly diverse radiation of trachelids that is currently very poorly known. Here, we describe two new species based on recently collected specimens in Madagascar: P. haddadi sp. nov., from the dry forests of the north-west, and P. mahimborondro sp. nov., from rainforests in the far north. We also redescribe P. madagascariensis (Simon, 1889) and P. mucronatus Simon, 1898, species previously described without illustrations, and provide the first key to the species of the genus.