As part of a survey of mammal and bird nests, new species, new male stages, and some feeding observations have been collected from what was formerly called the Androlaelaps ulysses group. As many features of this group are consistently different from Androlaelaps, and also from Haemolaelaps where it was formerly placed, this group is here elevated to Ulyxes new genus, and U. autolycus, U. euryc...

Androlaelaps ilhacardosoi, a new species of Laelapinae, is described from the pelage of a 3-lined marsupial, Monodelphis americana, collected on Ilha Cardoso, São Paulo State, Brazil. The description is based on the female, and the systematics of laelapine mites associated with neotropical marsupials is discussed.