Rugilus (Eurystilicus) mahanuvaraensis, Rougemont, 2014

Rougemont, Guillaume-Marie de, 2014, A new species of Rugilus (Eurystilicus) from Sri Lanka (Coleoptera, Staphylinidae, Paederinae), Revue suisse de Zoologie 121 (2), pp. 247-248 : 247-248

Rugilus (Eurystilicus) mahanuvaraensis n. sp.

Figs 1-4

HOLOTYPE: MHNG, ♁, CEYLAN Central, Kandy 600 m, 15.I. 170, leg. Mussard, Besuchet & Löbl / HOLOTYPE Rugilus (Eurystilicus) mahanuvaraensis des. 2013 G. de Rougemont.

DESCRIPTION: Head and pronotum pale reddish brown; elytra fuscous, the anterior and posterior 1/6 th yellowish, this colour not clearly demarcated from the dark part; abdominal tergites brown, the posterior 1/3 rd of seventh and eighth testaceous; palpi and antennae rufo-testaceous, legs pale testaceous (the specimen is somewhat teneral, the usual colour is therefore probably darker).

Habitus (fore-body) as in Fig. 1. Labrum with two small triangular teeth, without a noticeable median emargination. Head slightly transverse, the posterior angles broadly rounded but well marked, the puncturation very fine and dense, comparable to that of most Eurystilicus species, with one post-antennal and three post-ocular setae. Eyes about as wide as temples. Pronotum slightly elongate, with prominent anterior angles and sides strongly retracted to posterior angles, the puncturation similar to that of head, without a trace of an impunctate mid-longitudinal band, and with a stout humeral seta on each side. Elytra transverse, slightly longer and much broader than pronotum, the fine puncturation not very dense, and with numerous irregularly scattered larger nonsetiferous punctures, these punctures mostly not shallow, sub-conical with rounded rims as in most Eurystilcus species, but deep, with sharp rims, looking rather like needle pricks in modeling clay. Abdomen very finely and densely punctate.

Male: abdominal sternite VII unmodified; sternite VIII (Fig. 2) with a large apical emargination, the apical angles with 4-5 black setae of various lengths. Aedeagus (Figs 4-5) atypical of the subgenus, with very long narrow dorsal blade of the median lobe and characteristic structure of the ventral blade.

REMARKS: This new species does not fit readily in the key to the Oriental species given by Assing (2012). It runs to couplet 47 (-): species with “additional nonsetiferous punctures of elytra less coarse, more clear-cut, and usually more or less randomly distributed. …”, but differs from all five species included between couplets 50 to 53 in the elytral puncturation described above (Fig. 2), and especially in the unusual type of aedoeagus (Figs 3-4).