Four new species of chiggers (Acariformes: Parasitengonina: Trombiculidae and Leeuwenhoekiidae) and new locality of Quadraseta brasiliensis Goff & Gettinger, 1989 from Brazil.

Four new chigger species, belonging to genera Leeuwenhoekia Oudemans, 1911 (Leeuwenhoekiidae), Colicus Brennan 1970, and Herpetacarus (Vercammen-Grandjean 1960) (Trombiculidae), are described, based on specimens deposited in the Acarological collection at Centro de Coleções Taxonômicas da UFMG, including voucher material for which sequences from multiple genes are available, sampled from Minas Gerais and Amazonas states, Brazil. Leeuwenhoekia berthalutzaesp. nov. was found in association with the rodent Calomys sp. and Oligoryzomys sp., Colicus helenagrecaesp. nov. with the rodent Cerradomys cf. subflavus, Colicus carolinaesp. nov. in cave soil, off-host, and Herpetacarus mariellaesp. nov. in leaf litter, off-host. Additionally, we report a new record for Quadraseta brasiliensisGoff & Gettinger, 1989 associated with rodents from Parque Nacional Serra do Itajaí, Santa Catarina state. [ABSTRACT FROM AUTHOR]