Abstract
The spider genus Tamgrinia Lehtinen, 1967 currently includes three species from western China and the East Sikkim region of India: T. alveolifer (Schenkel, 1936), T. laticeps (Schenkel, 1936), and T. chhanguensis (Tikader, 1970). In this paper, two additional species are recognised: T. coelotiformis (Schenkel, 1963), which is removed from the synonymy of T. laticeps, and T. tulugouensis, sp. nov. The species Amaurobius potanini Schenkel, 1963 is newly synonymised with T. laticeps rather than with T. alveolifer. Both males and females of T. laticeps are described. The original female of T. laticeps described by Schenkel in 1963 is shown to be a species of the coelotine genus Paracoelotes Brignoli, 1982. A key to the species is provided. The spinneret, tracheae, and trichobothria morphology of the family Amaurobiidae are also described using representatives of eight genera from four of the five amaurobiid subfamilies. The sister-group relationship between Tamgrinia and Taira Lehtinen, 1967, and the subfamilial placement of the genus Tamgrinia are questioned.
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