Status of Nearctic subgenera of Microscydmus revisited (Coleoptera, Staphylinidae, Scydmaeninae) Author Jałoszyński, Paweł text Zootaxa 2017 2017-11-30 4358 3 journal volume 31265 10.11646/zootaxa.4358.3.8 9af6b3e2-4522-4219-b827-5adb389e474d 1175-5326 1068848 B45BD8C4-C084-4BAC-BF07-70378F008519 Neladius tenuis Casey , stat. rest. ( Figs 3, 6 , 9, 12 , 15 , 18–19 ) Neladius tenuis Casey, 1897 : 499 . Microcydmus ( Delius ) tenuis (Casey) ; Franz, 1985 : 176 . Microscydmus ( Neladius ) tenuis (Casey) ; O'Keefe: 264. Type material studied. Lectotype (here designated): : six labels ( Fig. 6 ): " CASEY / bequest / 1925" [white, printed], "St. Vinc / Penn." [white, printed], "48" [white, handwritten], " Neladius / tenuis / Casey" [white, handwritten], " Delius / tenuis (Casey) / Holotypus / det.H.Franz" [white, handwritten and printed], " TYPE USNM / 49123" [red, printed and handwritten] ( NMNH ). Paralectotype : , four labels: " CASEY / bequest / 1925" [white, printed], "St. Vinc / Penn." [white, printed], "48" [white, handwritten], "tenuis- 2 / PARATYPE USNM / 49123" [red, handwritten and printed] ( NMNH ). Diagnosis. As in genus, vide supra . FIGURES 13–15. Microscydmus ( Opresus ) misellus (LeConte) (13); Delius robustulus Casey (14); Neladius tenuis Casey (15); pterothorax and abdomen in ventral view. Abbreviations: msvp, mesoventral intercoxal process; mtvp, metaventral intercoxal process; pcr, procoxal rest; pm, paramere; stVII–VIII, abdominal sternite VII–VIII. FIGURES 16–19. Delius robustulus Casey (16–17); Neladius tenuis Casey (18–19). Aedeagus in ventral (16, 18) and lateral (17, 19) views. Description. Body of male ( Fig. 3 ) moderately convex, elongate, with moderately long appendages, BL 0.94– 1.00 mm; cuticle glossy, uniformly light brown; vestiture of setae slightly lighter than cuticle. Head ( Figs 3 , 9, 12 ) subtrapezoidal, broadest at eyes, HL 0.15–0.16 mm , HW 0.19–0.2 mm ; vertex and frons confluent, weakly convex; supraantennal tubercles feebly marked; tempora in anterior half nearly parallel; eyes small, weakly convex and finely faceted. Punctures on vertex and frons fine and inconspicuous; setae short, sparse, suberect. Antennae ( Fig. 3 ) short, AnL 0.38 mm ; scape and pedicel elongate, scape slightly longer than pedicel, antennomeres III–VII each about as long as broad, VII distinctly larger than VIII, VIII–X transverse, XI shorter than IX and X combined, about as long as broad. Pronotum ( Figs 3 , 9 ) in dorsal view oval, broadest in anterior third, PL 0.25 mm , PW 0.23 mm ; anterior margin rounded and confluent with lateral margins, which are strongly rounded in anterior half and nearly straight in posterior third, where they are strongly convergent; posterior corners strongly obtuse-angled and blunt; posterior margin rounded. Punctures on pronotal disc as fine as those on frons and vertex; setae short and sparse, suberect. Elytra ( Fig. 3 ) suboval, broadest in anterior third, EL 0.53–0.60 mm , EW 0.33–0.35 mm , EI 1.50–1.85; basal impressions and humeral calli absent; apices separately rounded. Punctures on elytral disc as inconspicuous as those on head and pronotum; setae sparse, short, suberect. Hind wings absent. Legs moderately long and slender; unmodified. Aedeagus ( Figs 18–19 ) elongate, AeL 0.18 mm , thin-walled, with symmetrical median lobe and strongly asymmetrical, darkly sclerotized and complicated endophallic structures; parameres strongly broadened distally and in apical region curved mesodorsally, each with one long subapical seta and one or two tiny apical setae. Distribution. Pennsylvania . Lectotype designation. Casey (1897) mentioned a male and a presumable female in his description. The male was identified by him on the basis of a tip of the aedeagus protruding from the genital opening, and this specimen, illustrated in Fig. 3 and with labels as in Fig. 6 is here designated as lectotype of Neladius tenuis Casey, 1897 . The other specimen turned out to be a male.