A review of the Neotropical genus Diochus ERICHSON, 1840 (Coleoptera: Staphylinidae: Staphylininae) Author Irmler, Ulrich text Beiträge Zur Entomologie = Contributions to Entomology 2017 2017-06-30 67 1 1 62 journal article 10.21248/contrib.entomol.67.1.001-062 0005-805X 5212522 6526DDDB-7F27-41AC-8575-AF3C28A4177C Diochus newtoni spec. nov. urn:lsid:zoobank.org:act: FD5C80C7-1C1E-4C8C-9D48-8FEC23D9365F Figs 19A–C , 38K , 42G Type material : male, Holotype : Panama : Panama Prov., Cerro Campano , 3200 ft. elev., Berlese, cloud forest leaf litter, 14., 23.2.1976 , leg. A. Newton ( FMNH ). Paratypes : 3 males , 4 females with same data as holotype ( FMNH , UIC ) . Diagnosis : Regarding the overall shape of the aedeagus, D. newtoni is closely related to D. schuelkei . The paramere is nearly identical to that of D. schuelkei , except the structure of the lateral triangular process, which is straightly upright in D. schuelkei , but curved and spoon-like in D. newtoni . Furthermore, colouration of D. newtoni is brown, whereas it is nearly black in D. schuelkei . It can be easily identified by the extremely small eyes from all other species of the group. The eyes are still smaller than those of D. inornatus . Description : Length: 4.7 mm . Colouration: dark brown, legs and antennae light brown. Head: 0.60 mm long, 0.50 mm wide; eyes small; not prominent; EL: HL 0.15; temples five times as long as eyes; distinctly divergent to posterior angles; PW: EW = 1.30, posterior margin curved; posterior angles obtuse; setiferous punctures deep, wide midline impunctate; along midline with line of five to six setiferous punctures; laterad with dense punctation; without microsculpture; surface shiny. Antennae as long as head and half of pronotum combined; first antennomere elongate; nearly as long as second and third antennomere combined; second and thrid antennomere conical; nearly twice as long as apical width; antennomeres four and five quadrate; following antennomere wider than long; eighth antennomere 1.5 times as wide as long; all antennomeres with moderately long stetae at apex; all antennomeres exept first antennomere pubscent. Pronotum: 0.74 mm long, 0.58 mm wide; sides aproximately parallel; anterior margin widely rounded; without distinct anterior angles; posterior margin shortly rounded with weak obtuse angles; lateral margin extremely fine; in dorsal aspect nearly invisible; setiferous punctures deep; along wide impunctate midline with three pairs of punctures in anterior half; interstice between anterior pair nearly twice as wide as between posterior pairs; few more punctures laterad; along lateral margin several punctures; wihtout microsculpture; surface polished. Elytra: 0.65 mm long, 0.71 mm wide; sides posteriorly divergent; widest at posterior margin; shoulders obtusely rounded; deep setiferous punctation in four irregular lines; four lines on disc; first line at suture with 7 to 8 punctures; along lateral margin with several long setae; with moderately deep coriaceous ground sculpture; surface less shiny than head and pronotum. Abdomen with dense pubescence. Aedeagus with thick seminal vesical; 0.6 times as long as total length of central lobe; basal inner duct looped; ending in wide funnel-like structure with apical forceps; filamentous apical duct forming one coil; parameres projecting central lobe; with two long setae at apex; laterad with trinagular process; process apically widened to irregular spoon-like structure; shaft with few sensillae at base. Spermatheca 0.26 mm long; 0.11 mm wide; bursa copulatrix in asymmetric position to coild duct; coiled duct oval; shoe-like. Etymology : The species is named to honour the tremendous work of Alfred Newton, Chicago, USA , for the knowledge of the Neotropical Staphylinidae .