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 triparcus sp. n. (Figs 119-129) Specimen examined - "Changhai, China, J.J. Walker" (holotype, male, BMNH). Description of male ( holotype) - This new species is rather similar to A. angusticlavis sp. n., so some characters shared by both species are omitted in the below description Length 5.0, width 3.3, height 1.6 mm. Moderately convex dorsally and slightly ventrally; dorsum subunicolorous dark chestnut brown; part of underside and appendages slightly lighter; dorsum and underside rather shining; body with moderately conspicuous fine greyish yellow hairs, about 3-4 times as long as distance between their insertions (on underside pubescence somewhat shorter) and dorsum also with sparser and much longer hairs; pronotal and elytral sides with dense cilia, consisting of hairs about as long as tarsal claws; paramedial brushes of long hairs situated at anterior 2/5 (these hairs about 1.5 times as long as hairs in cilia) (Figs 119-120). Head, pronotum and elytra with distinct punctures, about as large as eye facets, interspaces between them about as broad as a puncture diameter or somewhat broader, rather smoothed (on subsutural places in anterior part of elytra puncturation becoming shallower and less distinct, on disc of pronotum it somewhat sparser up to 2-3 puncture diameters). Prosternum with obsolete puncturation and microgranulose to subalutaceous, but its process with distinct and dense, very small punctures, interspaces between them about a puncture diameter and smooth. Metasternum with distinct and moderately dense punctures, slightly larger than eye facets in diameter, interspaces between them about a puncture diameter and completely smooth. Ventrites very finely and very densely microgranulose. Antennái club (Fig. 121) comprising about 2/7 of total antennái length, about 1.5 times as long as wide, antennomere 3 nearly as long as antennomere 2 and 1.5 times as long as antennomere 4. Pronotum with posterior edge regularly and rather widely rounded. Elytra about 5/6 as long as broad combined, their apices subtruncate and slightly oblique (and forming an open suturai angle). Pygidium very widely rounded to subtruncate at apex. Mentum subquadrangular, about 3 times as wide as long. Prosternum sharply carinate, but its process (Fig. 122) flattened and moderately widened at very widely rounded to subtruncate posterior edge. Median plate of mesosternum (Fig. 123) almost 3 times as wide as long, its posterior edge nearly straight. Metasternum subflattened in the middle. Hypopygidium shallowly emarginate before median movable lobe and with a weak, but distinct and comparatively wide protuberance bearing a brush of very short and dense setae at bottom of this emargination. Apex of last abdominal segment: Fig. 124. Ventral plate and spiculum gastrale: Fig 125. Tegmen moderately sclerotized (Figs 126-129). Diagnosis - The combination of the characters of the holotype of this new species is reminiscent of different species of the genus from the Indo-Malayan Region, however, it seems to be quite unique. The most characteristic features are the rather dark underside and appendages, reduced pubescence and sculpture on interspaces on dorsum, regularly rounded posterior angles of pronotum and subtruncate apex of prosternai process. In general the species looks more shining. Etymology - The Latin name of this species means "very stingy" referring to the paramedial brushes of hairs on male elytra.