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Thoasia Liebke, 1939 and Straneotia Mateu, 1961 of the Cryptobatida group, subtribe Agrina, Lebiini, living in the Neotropics are diagnosed, described, and illustrated. Occurrences of known species ranges are limited to the northern and western Amazon Basin and Guyana Shield. The following species are described as new: Thoasia surinamensis Erwin & Aldebron, sp. n., Suriname, Thoasia pterosmaragdos Aldebron & Erwin, sp. n., French Guiana, Thoasia manu Erwin & Aldebron, sp. n., Ecuador, Perú; Straneotia cylindroceps Erwin & Aldebron, sp. n., French Guiana, Straneotia confundis Aldebron & Erwin, sp. n., Ecuador, and Straneotia moi Aldebron & Erwin, sp. n., French Guiana. Two of these species, Thoasia manu and Straneotia moi are known from adults collected by insecticidal fogging of lowland rainforest trees, and these trees are listed in their respective descriptions. The following species are redescribed: Thoasia rugifrons Liebke, 1939, French Guiana, Venezuela; Straneotia freyi Mateu, 1961, Brazil; Straneotia amazonica Mateu, 1961, Brazil.

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