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

Amphicrossus factus sp. n. (Figs 34-42) Specimens examined - "Malakka. Perak" (holotype, male, ZMB); "E. Jacobson, Sum., Afr. Njuruk Dempu, 1400 m, 8.1916" (one paratype, RMNH). Description of male ( holotype) - This new species is rather similar to A. angusticlavis sp. n., so some characters shared by both species are omitted. Length 5.0, width 3.0, height 1.5 mm. Moderately convex dorsally and slightly ventrally; dorsum, meso- and metasterna light brownish, but the remainder of underside and appendages reddish to reddish brown; dorsum with a faint copper lustre, and underside moderately shining; body with well conspicuous fine golden hairs, 2-3 times as long as distance between their insertions and dorsum also with much sparser and much longer hairs, forming on elytra longitudinal rows; pronotal and elytral sides with dense cilia, consisting of hairs considerably shorter than tarsal claws; paramedial brushes of long hairs situated in anterior fourth (these hairs about 1.5 times longer than hairs in cilia) (Fig. 34). Head with distinct punctures, markedly smaller than eye facets, interspaces between them about as broad as a puncture diameter or slightly broader, densely and smoothly microreticulated. Pronotum and elytra with more or less smaller and sparser punctuation, and with more relief sculpture on interspaces. Prosternum with obsolete puncturation and relief irregular sculpture, its process also with indistinct punctures, with somewhat sculptured interspaces. Metasternum with distinct and dense punctures, somewhat smaller than eye facets in diameter, interspaces between them less than a puncture diameter and smoothly microreticulated. Antennái club (Fig. 35) comprising about a third of total antennái length, nearly twice longer than wide, antennomere 3 slightly longer than antennomere 2 and twice as long as antennomere 4. Pronotum (Fig. 42) with posterior edge at posterior angles distinctly and moderately oblique. Elytra about 11/12 as long as broad combined. Pygidium subtruncate at apex. Last labial palpomere about 1.5 times as long as wide and slightly widened apically. Mentum subquadrangular, about 2.5 times as wide as long. Prosternum moderately carinate, but its process (Fig. 36) flattened and rather widened at widely rounded posterior edge. Median plate of mesosternum almost 3.5 times as wide as long, its posterior edge nearly straight. Hypopygidium subtruncate before median movable lobe and without both median process or dense brush of hairs at base of movable lobe. Tibiae about as wide as antennái club. Protarsus slightly narrower protibia. Apex of last abdominal segment: Fig. 37. Ventral plate and spiculum gastrale: Fig. 38. Tegmen moderately sclerotized (Figs 39-41). Variability - Length 4.7-5.0 mm. Diagnosis - This new species is characterized by the comparatively elongate antennái club, which is less narrow than that of A. angusticlavis sp. n. It has a combination of the distinguishing characters which are used in the key below and mentioned in the diagnosis of the previous species. In addition to the these characters, the type specimens of A. factus sp. n. have the paramedial brushes along male elytral suture somewhat longer than those in A. angusticlavis sp. n., but with hairs about as loose as those in the latter. Etymology - The Latin name of this species means "polished", "refined", "worked".