The Spilosoma group of species from New Guinea and adjacent islands (Lepidoptera: Erebidae: Arctiinae: Arctiini)..

Species in the genus Spilosoma Curtis, 1825 from New Guinea and adjacent islands are revised.
Species groups are recognized primarily according to similarities in genitalia structures and secondarily to other external characters. The genus Spilosoma is in New Guinea and adjacent islands represented by 27 species of which 10 are new to science: Spilosoma adriani sp. nov., S. cinnamomea sp. nov., S. enarotali sp. nov., S. grandimacula sp. nov., S. mastrigti sp. nov., S. nana sp. nov., S.
postbrunnea sp. nov., S. transversa sp. nov., S. vulgaris sp. nov., S. wernerthomasi sp. nov.
Diacrisia eichhorni Rothschild, 1917 proved to be conspecific with Diacrisia pratti Bethune- Baker,
1904 and is downgraded to subspecies level. In the closely related Spilaethalida Dubatolov et al.,
2007 the taxa Diacrisia sordidior Rothschild, 1910, Diacrisia montana Rothschild, 1910, Diacrisia
alpina Rothschild, 1914 and Diacrisia woodlarkiana Rothschild, 1910 are synonymized with the
nomotypical subspecies of Diacrisia turbida Butler, 1882. All species are described or redescribed
and imagines and male and female genitalia are figured.