A new genus, Neopectinimura Park, of the subfamily Lecithocerinae (Lepidoptera, Gelechioidea, Lecithoceridae) is described, based on the type species, Neopectinimura beckeri Park & Byun, sp. nov, from Papua New Guinea. Four additional new species for the new genus, N. calligina Park & Byun, N. madangensis Park & Byun, N. setiola Park & Byun and N. morobeensis Park & Byun are described. The genus is separable from its allied genus Pectinimura Park by the short and rounded forewing, with R5 absent, the unique character of antennae with long hairs, and often with an extremely long third segment of the labial palpus. A key to the 5 species of the genus is given. Illustrations of adults, wing venations, and the male genitalia are provided.