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Eighteen new species of Oecetis are described, diagnosed, and illustrated from New Caledonia: Oecetis amphora sp. nov., Oecetis ovula sp. nov., Oecetis ramosa sp. nov., Oecetis loyolaensi sp. nov., Oecetis millei sp. nov., Oecetis christinae sp. nov., Oecetis rostrata sp. nov., Oecetis alicae sp. nov., Oecetis oxybelis sp. nov., Oecetis dorsospina sp. nov., Oecetis multidentata sp. nov., Oecetis gracilis sp. nov., Oecetis rostra sp. nov., Oecetis triramosa sp. nov., Oecetis flucta sp. nov., Oecetis nouvellecaledoniensis sp. nov., Oecetis variabilis sp. nov., and Oecetis ovata sp. nov. A diagnostic key is provided for males of Oecetis species of New Caledonia. The species display similarities in genitalic characteristics but also a high diversity of apomorphic features. The new species were collected from lotic habitats across most of Grande Terre.

The ant-mimiking spider genus Myrmecium Latreille, 1824 is revised, including 38 species, all herein diagnosed, described and illustrated. The following synonymies are proposed: Myrmecium aurantiacum Mello-Leitao, 1941 syn. nov. with M. camponotoides Mello-Leitao, 1932; M. gounellei Simon, 1896 syn. nov. and M. obscurum Keyserling, 1891 syn. nov. with M . latreillei Lucas, 1857; M. itatiaiae Mello-Leitao, 1932 syn. nov. and M. vertebratum Walckenaer, 1837 syn. nov. with M. rufum Latreille, 1824. Myrmecium bonaerense Holmberg, 1881 is considered as species inquirenda . Males of M. dacetoniforme , Mello-Leitao, 1932, M. fuscum Dahl, 1907, M. latreillei Lucas, 1857, M. trifasciatum Caporiacco, 1947 and adults of M. viehmeyeri Dahl, 1907 and M. reticulatum Dahl, 1907 are described for the first time. Myrmecium bifasciatum Taczanowski, 1874, M. monacanthum Simon, 1897 and M. rufum Latreille, 1824 are also redescribed and illustrated. The following 28 new species are described, diagnosed and illustrated: M. amphora sp. nov. (female from Chichiriviche, Venezuela); M. bolivari sp. nov. (male and female from Caracas and Sucre, Venezuela and Colombia); M. carajas sp. nov. (male from Para, Brazil); M. carvalhoi sp. nov. (female from Piaui, Tocantins and Goias, Brazil); M. catuxy sp. nov. (female from Amazonas, Brazil and Puerto Lopez, Colombia); M. chikish sp. nov. (female from Huanuco, Peru); M. cizauskasi sp. nov. (male and female from Amazonas, Brazil); M. oliveirai sp. nov. (male from Amazonas, Brazil); M. deladanta sp. nov. (male from Sucumbios, Ecuador); M. diasi sp. nov. (male and female from Amazonas, Brazil); M. erici sp. nov. (female from British Guiana); M. ferro sp. nov. (female from Paraiba, Brazil); M. indicatti sp. nov. (male and female from Para, Brazil); M. nogueirai sp. nov. (female from Amazonas, Brazil and Madre de Dios, Peru); M. lomanhungae sp. nov. (male and female from Amazonas and Para, Brazil); M. machetero sp. nov. (female from Beni, Bolivia); M. malleum sp. nov. (male and female from Aragua and Lara, Venezuela and Caldas, Colombia); M. oompaloompa sp. nov. (male and female from Bahia, Brazil and Kurupukari, Guyana); M. otti sp. nov. (male and female from Para, Amazonas and Mato Grosso, Brazil and Madre de Dios in Peru); M. pakpaka sp. nov. (male and female from Huanuco, Peru); M. raveni sp. nov. (male and female from Amazonas and Para, Brazil); M. ricettii sp. nov. (male and female from the states of Para, Alagoas, Sergipe, Bahia, Goias and Mato Grosso, Brazil and Puerto Lopez, Colombia); M. luepa sp. nov. (male from Bolivar, Venezuela); M. souzai sp. nov. (male from Amazonas, Brazil); M. tanguro sp. nov. (male and female from Rondonia, Mato Grosso, Brazil); M. tikuna sp. nov. (male from Amazonas, Brazil); M. urucu sp. nov. (female from Amazonas, Brazil); M. yamamotoi sp. nov. (male and female from Amapa, Amazonas and Para, Brazil and Marowijne, Suriname).