Two new species of perlid stoneflies, Acroneuria bachma n. sp. and A. magnifica n. sp., are described from tropical Vietnam. Descriptions of these species are given based on male and female adults, nymphs, and eggs. The adult of A. bachma is distinguished by the presence of a large dark brown marking in the interocellar area and by the absence of patches of sensilla basiconica on the 9th abdominal tergum; the nymph is distinguished by the presence of a narrow and complete M-line marking on head and by the absence of gills on paraprocts. The adult of A. magnifica is distinguished by presence of a distinct light-yellow M-line marking on head and patches of sensilla basiconica which are sparsely distributed on the 9th abdominal tergum; the nymph is distinguished by the presence of an incomplete M-line marking on head and gills on paraprocts. Line-drawings and macro-photographs of the diagnostic characters are provided. Adult and nymphal keys to Southeast Asian species of Acroneuria are also provided.
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Vol. 80 • No. 3