Stenus houhanmontis, Puthz, 2012

Puthz, V., 2012, On the Stenus LATREILLE 1797 from Taiwan with non-spotted elytra (Coleoptera, Staphylinidae) (327 Contribution to the Knowledge of Steninae), Linzer biologische Beiträge 44 (2), pp. 1431-1475 : 1453-1454

Stenus houhanmontis nov.sp. ( Fig. 79 )

Type material: Holotype (♂): Taiwan: Nantou Hsien: Houhanshan , 3175m, 15.V.1990, A. Smetana (T 59): in coll. Smetana (Ottawa).

Description: Micropterous, black, nearly dull, head moderately coarsely, very densely punctate, pronotum coarsely and very densely, elytra coarsely and slightly coalescently punctate, abdomen moderately finely and moderately densely punctate; pubescence, short, recumbent. Segment 1 and base of segment 2 of maxillary palpi reddish yellow, remainder brown. Antennae dark brown. Legs dark brown, basal half of femora chestnut-brown. Clypeus and labrum blackish, moderately densely pubescent.

Length: [2.3-] 2.7mm (forebody: 1.35mm).

PM of the HT: HW: 26; DE: 17; PW: 20.5; PL: 19.5; EW: 24.5; EL: 22; SL: 16.

Male: Metatibiae with a tiny preapical spur. Anterior sternites simple, sternite 7 shallowed in posterior middle, finely and densely punctate and pubescent. Sternite 8 with a shallow, moderately broad emargination in about posterior sixteenth of the sternite. Sternite 9 acute apicolaterally, but the apicolateral tooth not completely smooth laterally indicating rudimentary denticles. Aedeagus very close to that of S. rugipennis SHARP , but the expulsion hooks broader (fig. 79); parameres with 17 setae apically.

Female: Unknown.

Head broader than elytra, frons very broad with distinct longitudinal furrows, median portion about as broad as each of the lateral portions, distinctly elevated, exceeding the level of medial eye margins; punctation moderately coarse, diameter of punctures about as large as medial cross section of antennal segment 3, interstices smaller than half diameter of punctures. Antennae short, when reflexed, extending to the posterior third of pronotum, penultimate segments about as long as broad. Pronotum slightly broader than long, sides strongly convex in anterior two thirds, moderately concavely narrowed behind; a very shallow longitudinal impression along middle; punctation slightly coarser than on frons, also very dense, diameter of punctures about as large as apical cross section of anmtennal segment 2. Elytra sub-trapeziform, broader than long, shoulders moderately obtuse, sides distinctly but not much widened behind, posterior margin broadly emarginate; no distinct impressions; punctation slightly coarser than that of the pronotum but slightly coalescent. Paratergites of the abdomen slightly declining ventrad, moderately broad, those of tergite 4 nearly as broad as antennal segment 2; basal furrows of anterior tergites moderately deep, tergite 7 without an apical membranous fringe; punctation moderately fine anteriorly, fine posteriorly, interstices on tergite 3 nearly as large as punctures, larger on tergite 7, tergite 10 with few very fine punctures. Legs short, metatarsi two thirds as long as metatibiae, segment 1 slightly shorter than the 2 following segments combined, about as long as the last segment; Segment 4 deeply bilobed. The whole insect densely and deeply reticulate.

Comparative notes: This new species is closely related to the next two micropterous species, which all three are closely related to the macropterous species S. rugipennis SHARP and S. suspectatus PUTHZ. It may be distinguished from S. kuanmontis nov.sp. by the trapeziform elytra and much denser reticulation of the forebody, from S. hseuhmontis nov.sp. by coarser and denser punctation of the pronotum and coarser, slightly coalescent elytral punctation. For identification see also the key.

Etymology: The name is derived from the type locality.

Figures

Figs 78-82: Sternite 8 of females (78, 80), expulsion hooks of median lobe (79) and spermatheca (81, 82) of Stenus kuanmontis nov.sp. (78, 81, HT), S. houhanmontis nov.sp. (79, HT) and S. hseuhmontis nov.sp. (80, 82, HT).- Scale =0.1mm (78=79; 81=82).