Abstract
Two new species of Polydictya Guerin-Meneville, 1844 from Vietnam, P. grootaerti sp. n. from Central Vietnam and P. drumonti sp. n. from North Vietnam, are described and compared with the closest species, P. chantrainei Nagai & Porion, 2004 and P. kuntzi Nagai & Porion, 2004. The male genitalia are described and illustrated for the two new species as well as for P. vietnamica Constant & Pham, 2008 for the first time. Habitus details and photographs, a distribution map and photographs of specimens in nature when available, are provided. The occurrence of P. vietnamica from Thailand and Northeast India, noted here for the first time based on photographs taken in nature, requires confirmation based on the examination of specimens. An identification key to the species of Polydictya from the Indochinese region is provided.
Highlights
The genus Polydictya was erected by Guérin-Méneville (1844) to accommodate one species, Eurybrachys basalis Hope, 1843, described from Sylhet (Bangladesh)
Seven species of Polydictya are currently recorded from the Indochinese Peninsula, with three of them described from Vietnam within the last 8 years
Recent research and additional data based on photographs have greatly extended the recorded distribution of P. vietnamica
Summary
The genus Polydictya was erected by Guérin-Méneville (1844) to accommodate one species, Eurybrachys basalis Hope, 1843, described from Sylhet (Bangladesh). The genus presently contains 28 species (Bourgoin, 2016) It is distributed in the Oriental region: from Sri Lanka to northern India, Thailand, Vietnam, southwards to Sulawesi and its adjacent islands through Indonesia, but it is not recorded from the Philippines. P. basalis and P. tricolor were mentioned by Distant (1918) from “Indochina” (without further details), and from Vietnam (again without a precise location) by Nagai & Porion (1996). The latter authors probably based their data on Distant’s (1918) paper but, as Indochina (i.e. former French Indochina in this case) includes Vietnam and Laos and Cambodia, the presence of the species in Vietnam was not ascertained.
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