Abstract
Through the kindness of Prof. Dr. J. Illies, I have had an opportunity to examine a collection of Plecoptera made by Dr. W. L. Peters and Mrs. J.G. Peters in 1964 and 1965 in Thailand and India. This consists of 25 imagines and 202 nymphs, which belong to two families and fall into six genera, one of which is new, and contains two new species. Though specific identification of most of these nymphs must remain in question, I have attempted to discuss and illustrate them in detail for the purpose of adding them to our knowledge of the south-east Asiatic stoneflies. The stonefly fauna of south-east Asia as well as of India has been already described by several European and American authors, but our knowledge of the stonefly fauna of Thailand is very scanty and a large number of species remain undescribed. Most of the descriptions of theknown species from the region are also, unfortunately, inadequate. The species represented in the above mentioned collection are described below.

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