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Four species of Lachesilla, from Mexico and Guatemala, are here described and illustrated. Together with L. asperiforceps Garcia Aldrete, from Mexico, Guatemala and Nicaragua, they constitute the L. asperiforceps species complex, a diagnosis of which is provided, as well as identification keys to the males and females of the species in the complex. The types and other material studied are deposited in the National Insect Collection, within the Instituto de Biologia, UNAM, Mexico City (CNIN).

A new species of Lachesilla, from Cabrits National Park, St. John’s Parish, Dominica, is here described and illustrated. The phallosome is V-shaped, and it is autapomorphic in having the distal ends of the apodeme arms articulated to each clasper. Based on these characters, a new species group is created, close to the L. forcepeta and L. palmera species groups (the latter also diagnosed in this paper). The holotype is deposited in the National Insect Collection (CNIN), Instituto de Biologia, Universidad Nacional Autonoma de Mexico, Mexico City.

Three species of Lachesilla from Peru and Mexico are described and illustrated. They are based on male specimens, characterized by having a clunial apophysis over the area of the epiproct. The Mexican species constitutes a new species group, and the 2 Peruvian species belong in the pedicularia group. Types are deposited in the National Insect Collection (CNIN), housed in the Instituto de Biologia, Universidad Nacional Autonoma de Mexico.

Se listan las especies de Psocoptera actualmente registradas en Brasil, incluyendo la distribucion por estado y su categoria biogeografica. Se presenta alguna de la evidencia que hace suponer que el tamano actual de la fauna de Psocoptera de Brasil esta subestimada.