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New records of Stiliderus from Nepal (Coleoptera, Staphylinidae). 21st contribution to the knowledge of Staphylinidae

1986; Natural History Museum of Geneva; Volume: 93; Linguagem: Inglês

10.5962/bhl.part.79690

0035-418X

Georges Rougemont,

Lepidoptera: Biology and Taxonomy

Smetana & Lobi (in colis Smetana & Rougemont). The exx. from each of these localities are two distinct forms which, according to my analysis of the fenestratus group based on the little material then available, appear to be new species.The exx. from Khandbari District are indistinguishable externally from those of a series of (S. assamensis Rougemont) from Meghalaya (see Rougemont 1985) but larger than the unique Type.They differ from the former only in their proportionately somewhat smaller elytra, slightly stouter paramere, and the slightly angled sides of the emargination of the male eigth sternite.The other form, from Parbat District, is externally distinct from all members of the group except S. incognitus Rougemont in its entirely dark legs and more robust build, and is further distinguished by a longitudinal sparsely punctured, shiny callus on either side of the median axis of the pronotum.The male sexual characters however are identical with those of (S. assamensis) allowing minute differences in the shape of the paramere.The discovery of these two forms, added to the series of atypical 5. assamensis in Meghalaya and two single females from other localities blurs the distinctions between this taxon, S. kambaitiensis Scheerp., and S. dubius Rougemont.S. kambaitiensis Scheerp.must now be regarded as a widespead, variable species, distinguished only by the sexual characters: apical emargination of male eigth sternite simple, or at most with slightly angled sides, not strongly sinuate or with a distinct parallel sided fundus; parameroid lobes very long and pointed; paramere simple, straight or slightly recurved from the median lobe, without dorsal processes, at most with a minute apico-ventral tooth (Figs. 27, 29, 32 in Rougemont, in press).Of the eight members of the fenestratus group with maculate elytra recognised in my revision, S. fenestratus Fv. and S. incognitus Rougemont (the latter described from a Paratype of S. kambaitiensis) are very clearly defined by the short, externally almost invisible parameroid lobes, the paramere which is strongly recurved towards the ventral face of median lobe, and the shapes of the male eighth sternites, in addition to the exoskeletal characters used in my key. 5. siamensis Rougemont and S. nepa/ensis Rougemont also appear to remain well characterised by the combination of elaboration of the shape of the paramere, and the shapes of the male eight sternites.Although the synonymy is not proposed in this paper, it is recognized as probable that the different forms of S. kambaitiensis are conspecific with S. signatus Sharp, from which they are inseperable on the basis of the criteria advanced above.S. signatus, the Genotype of Stilicoderus Sharp, is presently regarded as an endemic of Japan.Recent material, examined since my revision went to press, shows that this too is a very variable species, particularly in size and colour, some exx.being almost immaculate.No comparable forms are yet known from the vast interlying areas of China, where their occurence seems probable.