A new genus and species of Calocidae (Trichoptera:Insecta) from south eastern Australia. Latarima gen. nov. (Trichoptera: Calocidae) is described from southeastern Australia based on the male adult, male pupa, and larva. Two species are included, L. explicatala sp nov. and L. furcilla (Neboiss, 1984a) comb. nov. Males of Latarima gen. nov. are distinct from other Calocidae genera in that segment X of the genitalia is widely incised, forming two elongate sections on the segment. Larvae are distinguished by a reticulate texture of the head capsule and a frontoclypeus that widens suddenly towards the anterior and possesses many setae in the antero-lateral corners. Larvae were previously placed in the interim genus Cal/Hel Genus G by Jackson (1998). This work increases the number of Calocidae genera to 7.