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

from "S. Formosa, Fuhosho, VII.

09, Sauter S.V." remain unnamed because it is impossible to distinguish females of this species and A. japonicus. Description of male (holotype) - This new species is rather similar to A. angusticlavis sp. n. Therefore, some characters shared by both species are omitted in the below description. Length 5.6, width 3.4, height 1.8 mm. Moderately convex dorsally and slightly ventrally; dorsum dark brown; underside brownish; appendages reddish brown, but antennái club dark brown; body with a moderate coppery shine; body with moderately conspicuous fine golden hairs, about 2-3 times as long as distance between their insertions and dorsum also with sparser and longer hairs, forming on elytra longitudinal rows; pronotal and elytral sides with dense cilia, consisting of hairs considerably longer than tarsal claws; paramedial brushes of long hairs situated in anterior third (these hairs as long as hairs in cilia) (Fig. 56). Head, pronotum and elytra with distinct punctures, about as large as eye facets, interspaces between them somewhat narrower than a puncture diameter, densely and smoothly microreticulated. Prosternum nearly microgranulose and microreticulated, but its process with distinct punctures, much smaller than half an eye facet in diameter, interspaces between them more or less broader than a puncture diameter and smooth. Metasternum with distinct and dense punctures, about as large as eye facets, interspaces between them less than a puncture diameter and rather smoothly microreticulated to completely smooth. Ventrites extremely finely and extremely densely microgranulate. Antenna! club (Fig. 57) subovoid, comprising about 2/7 of total antennái length, nearly 1 and 1/3 longer than wide, antennomere 3 slightly longer than antennomere 2 and about twice as long as antennomere 4. Pronotum (Fig. 55) with posterior edge at posterior angles distinctly and moderately oblique. Elytra about 7/8 as long as broad combined. Pygidium distinctly emarginate at apex. Mentum subquadrangular. about 2.5 times as wide as long. Prosternai process (Fig. 59) flattened and widened at very widely rounded posterior edge. Median plate of mesosternum (Fig. 58) almost 3 times as wide as long, its posterior edge subrectilinear. Metasternum subflattened in the middle. Hypopygidium rather deeply emarginate before median movable lobe and with narrow median process bearing a dense brush of very short hairs just at base of movable lobe (Fig. 61, 63). Apex of last abdominal segment: Fig. 60. Ventral plate and spiculum gastrale: Figs 62, 64. Tegmen well sclerotized (Figs 65-71). Female - Differs from the male in the widely rounded apices of pygidium and hypopygidium as well as in absence of paramedial brushes of long hairs on elytra. Variability - Length 4.1-7.4, width 2.7—L0 mm. This is the most variable species among the Palaearctic and Indo-Malayan congeners. Body in most specimens almost unicolorous, varying from straw reddish to nearly blackish with somewhat lighter appendages, although in most darker specimens underside more or less lighter. However, many specimens from the Philippines are somewhat lighter with dark longitudinal patches on pronotum and elytra. Pubescence is also very different in various specimens, and in the Philippine ones it is particularly conspicuous. Puncturation and sculpture on interspaces between punctures of the dorsal sclerites are quite variable, sometimes punctures on elytra considerably larger than those on head and pronotum, interspaces between punctures on pronotum can be up to twice as broad as a puncture diameter, although some specimens (mostly from the Philippines) have rather dense punctures and interspaces between them are not infrequently with dense and rather contrasting microsculpture. The paramedial brushes on elytra are also quite variable, and in many specimes from "Arnhemia" are with very reduced brushes. The posterior edge of pygidium sometimes not clearly emarginate, and all specimens from the Philippines and some specimens from neighbouring islands it is subtruncate rather than emarginate. A particular variability is expressed in the shape of lateral lobes of tegmen: in some cases they are strongly compressed laterally (this feature of genitalia is mostly correspondent with subtruncate posterior edge of pygidium). Finally, a rather wide variability is traced also in the shape of apex of lateral lobes of tegmen: the lat-