Studies on Stiliderus Motschulsky and Stilicoderus Sharp: biogeographical notes and descriptions of new species (Coleoptera: Staphylinidae: Paederinae) Author Rougemont, Guillaume De text Stuttgarter Beiträge zur Naturkunde A, Neue Serie 2015 2015-04-30 8 113 130 journal article http://doi.org/10.5281/zenodo.3833627 a18c0d1c-bdee-460d-b89a-07f536714c46 3833627 080B9FD6-D81F-4AF2-9B82-B5A0C65D8792 Stilicoderus kolaensis n. sp. Holotype ( ♂ ): Indonesia , Maluc., Aru Isls , Kola Isl. , Wafan , 27.VIII. [19]91, AGOSTI F91969 , “2” ( MHNG ) . P a r a t y p e s: 1 ♂ , 2 ♀♀ , same data as holotype (2exx. MHNG , 1 ex. CRO ) . Description Body length 3.8–4.1 mm . Proportions of holotype : length of head: 58; breadth of head: 63; diameter of eye: 24; length of antenna: 105; length of pronotum: 60; breadth of pronotum: 52; length of elytron: 68; breadth of elytra: 65; metatibia: 59; metatarsus: 40. Pitchy black, elytra somewhat paler, dark brown, legs entirely testaceous, palpi and antennae testaceous to rufotestaceous. Male: sternite VIII not emarginate, the posterior margin merely slightly concave. Aedoeagus see Fig. 5 , the apex of the median lobe and apices of lateral lobes explanate in lateral view, strongly compressed in ventral view. Differential diagnosis One of the smallest members of the group, in size comparable to S. riedeli n. sp. and S. laticeps n. sp. described above. This new species differs from S. hieroglyphicus by its smaller size and transverse head with distinct apicolateral angles. From S. laticeps n. sp. it differs by its even smaller size and less transverse head. It is externally indistinguishable from S. riedeli . From these and all other species it is clearly distinguished by the aedoeagus ( Fig. 5 ). Remark S. kolaensis is the first member of the genus recorded from the Aru islands, where it is probably endemic.