Description of a Sumatran species of the Lucanoid genus Nigidius
Notes from the Leyden Museum , Volume 11 - Issue 1 p. 1- 2
This species, the second hitherto described from the Malayan Archipelago 1), belongs to Parry’s 2) Section A (mandibles robust, with a recurved process at the base), a (prothorax punctate, with a central fovea), *(anterior angles of the prothorax non-emarginate), and is therefore allied to cornutus Macl., distinctus Parry and obesus Parry. — From the latter it differs by its narrower and more elongate shape, by its finer punctuation, by the otherwise shaped sides of the head and front angles of the prothorax, by the presence of a tubercle on the centre of the front margin of the thorax, etc. — From cornutus and distinctus it differs in the shape of the mandibles, of the sides of the head and of the prothorax; this latter shows moreover a much finer punctuation, whereas the central fovea is smaller and very shallow. Length (without mandibles) 15 mm., breadth at the shoulders 5 3/4 mm. — Elongate, parallel, glossy black. — The head very densely punctured on the raised occipital parts, much finer and sparser on the anterior portion of the depressed part, the flattened sides vaguely punctured, their outer margin slightly thickened or thrown up. The mandibles show, as in obesus Parry 1), at the base on the outside a blunt tooth or tubercle which is absent in cornutus Macl. and distinctus Parry; the top of the recurved process of the mandibles is faintly bifid which is not the case in the three allied species. The expansed sides of the head are rounded, but show a small emargination in their anterior half; in cornutus the sides of the head are entire, in distinctus strongly and widely emarginate, forming two distinct acute angles.
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Ritsema Cz., C. (1889). Description of a Sumatran species of the Lucanoid genus Nigidius. Notes from the Leyden Museum, 11(1), 1–2.