Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 97. (Budapest 2005)

Kirejsthuk, A. G.: On the fauna of Nitidulidae (Insecta, Coleoptera) from Taiwan with some taxonomical notes

Head slightly shorter than distance between eyes (eyes composing of very small facets). Anterior edge of labral lobes subtransverse (Fig. 24); exposed part of labral lobes somewhat less than third of combined width of their base. Antennae slightly shorter than head width, their club (Fig. 25) comprising about a third of total antennái length, nearly twice longer than wide, antennomere 3 slightly longer than antennomere 2 and significantly longer than antennomere 4. Pronotum with posterior edge at posterior angles slightly oblique. Elytra about 6/7 as long as broad combined. Pygidium very videly rounded at apex. Last labial palpomere (Fig. 26) about 1.5 times as long as wide and slightly widened apically. Mentum subquadrangular, about 3 times as wide as long. Prosternum sharply carinate, but its process (Fig. 27) flattened and rather widened at widely rounded posterior edge. Median plate of mesosternum almost 3 times as wide as long, its posterior edge nearly straight. Hypopygidium subtruncate to shallowly emarginate before median movable lobe and with a dense brush of hairs just along base of movable lobe. Protibia somewhat wider than antennái club; mesoand metatibiae slightly wider. Pro- and mesofemora about 1 and 2/3 as wide and metafemur nearly twice as wide as corresponding tibiae. Protarsus slightly narrower protibia. Apex of last abdominal segment: Fig. 28. Ventral plate and spiculum gastrale: Fig. 29. Tegmen moderately sclerotized (Figs 30-33). Variability - Length 3.8-5.3 mm. Variability is apparent in coloration, puncturation and conspicuousness of pubescence. The paramedial brushes of hairs along male elytral suture in all cases consist of comparatively short and not dense hairs, sometimes slightly different from the other hairs on dorsum (hairs in the paramedial brushes on male elytra of the small paratype from Sabah are rather reduced). Diagnosis - This new species has a combination of the distinguishing characters which are used in the key below. It seems to be more closely related ioA.factus sp. n., differing from it in the longer and narrower antennái club, posterior edge of pronotum slightly oblique at posterior angles, absence of median convexity before movable lobe of the hypopygidium, shape of ventral plate and spiculum gastrale as well as in the shape of lateral lobes of tegmen. Etymology - The epithet for this new species is formed from the Latin "angustus" (narrow, slender) and "clavus" (nail, peg, club). Figs 42-63. 42. Amphicrossus factus sp. n., male, holotype, pronotum, dorsal. 43-54. Amphicrossus hirtus sp. n., male, holotype: 43 = pronotum, dorsai, 44 = elytron with contour of darkened places and one of paramedial brushes, dorsal, 45 = ibid., lateral, 46 = antennái club, 47 = prosternai process, ventral, 48 = median plate of mesosternum, 49 = apex of last abdominal segment, ventral, 50 = ventral plate and spiculum gastrale, ventral, 51 = tegmen (left: ventral, right: dorsal), 52 = ibid., lateral, 53 = apex of lateral lobe of tegmen, from view indicated by arrow in Fig. 52, 54 = ibid., specimen from Brunei. 55-63. Amphicrossus lobanovi sp. n., male, holotype: 55 = pronotum, dorsal, 56 = elytron with one of paramedial brushes, lateral, 57 = antennái club, 58 = median plate of mesosternum, ventral, 59 = prosternai process, ventral, 60 = apex of last abdominal segment, ventral, 61 = median process at bottom of apical emargination of hypopygidium, 62 = ventral plate and spiculum gastrale, ventral, 63 = specimen from Borneo, median process at bottom of apical emargination of hypopygidium. Scales: A - to Figs 42-45, 55, 56, B - to Figs 46-49, 57-60, C - to Figs 50-52, 62