Tynacantha umeridenigrata Brugnera & Grazia sp. nov.

(Figures 16–18, 52–53, 55)

Holotype ♀, BRAZIL, Rondônia, Ouro Preto, V. 1980, A. C. Mendes leg., (MZUSP).

Diagnosis. Dorsal coloration brown, apex of scutellum with a calloused, crescent-like pale spot, humeral angles black and punctured; punctures black, deep and close to each other; intersegmental areas of connexivum black (Figs 16–18); posterior margins of gonocoxites VIII sinuous (Figs 52–53).

Measurements. Total length, ♀ 11.92; width of abdomen across segment III, ♀ 5.80; head: length, ♀ 2.00; width, ♀ 2.00; pronotum: length, ♀ 2.40; width, ♀ 5.60; scutellum: length, ♀ 3.80; width, ♀ 3.32; length of anten- nal segments: I, ♀ 0.28; II, ♀ 1.44; III, ♀ 1.28; IV, ♀ missing; V, ♀ missing; length of labial segments: I, ♀ 1.28; II, ♀ 1.60; III, ♀ 1.04; VI, ♀ 0.92.

Etymology. From umeri (Latin) and denigratum (Latin), in reference to the darkened color of humeral angles.

Distribution. Brazil (Rondônia) (Fig. 55).

Remarks. Male unknown.