Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 76. (Budapest 1984)

Kirejtshuk, A. G.: New taxa of Nitidulidae (Coleoptera) from the Indo-Malayan fauna

Diagnosis. — This species is distinct in the genitalia of its sexes but externally it may be identified from the following key. Incidentally, X. variegatus FAIRM. has been becoming increasingly common from year to year as from 1980 in the Primorie Territory (USSR), where it had not been recorded before. KEY TO THE IN DO-MALAYAN SPECIES OF THE XENOSTRONGYLUS WOLLASTON 1 Head about twice as broad as long; dark brown, with light (nearly silver) pubescence on dorsum, except pronotal discal spot with dark hairs as well as hoop-shaped one with light center behind scutellum, transverse one in distal third of elytra and longitudinal along their side margins. 2.2-2.8 mm. On Brassica and Cardamine spp. and other Brassicaceae. — Primorie Territory, South China X. variegatus FAIRMAIRE, 1891 — Head about 3 times as broad as long; lighter, brown or reddish brown with other coloration of pubescence, at least pronotum unicolorously pubescent and light 2 2 Clypeal area scarcely projecting, nearly forming a continuous arc together with side parts of frons eye edges; dorsal pubescence considerably shorter, yellowish, without any dark hair. 2.2-2.4 mm. — Philippine Islands X. philippinensis sp. n. — Clypeal area feebly projecting ahead ; dorsal pubescence longer, nearly golden, with dark hairs on elytra over around and dark surface mark behind scutellum and on longitudinal stripe along but separated from elytral outer edges. 2.3-2.7 mm. — Widely distributed in South India, Sri Lanka, Vietnam X. dorsalis GROUVELLE, 1908 Taenioncus gen. n. Type-species: Carpophiluscylindricus MVRRAY, 1864. Elongate, subparallel-sided, evenly convex; dorsum and venter with distinct pubescence. — Head weakly convex, its anterior margin abrupt, feebly angulately projected at antennái insertions. Labrum narrowly and deeply excised. Antennae about as long as head broad with compact 3-segmented club. Pronotum strongly bordered along sides but without any trace of basal border, all corners rounded off. Scutellum subtriangular. Elytra with moderately raised shoulders and abrupt as apex, their subsutural lines following extremely closed along the suture. Two last tergites as well as pygidium exposed from under elytral apices. Pygidial apex almost abrupt in male and rounded off in female. — Ventral surface more convex than dorsal. Antennái furrows convergent. Mentum subpentagonal, with base widest. Last segment of labial palpi approximately as long as wide, dilated towards abrupt apex. Fore coxae incompletely closed: lateral fold of propleura and apex of prosternai process approaching but not fusing. All pairs of coxae drawn together. Elytral epipleura sloping upwardly laterally. — Tibiae narrow and feebly bilated towards their apices, fore with irregular crenulation at outer edge. First 3 segments of tarsi cordiform. Male. Anal sclerite hardly exposed and not curving towards ventral surface. Tegmen deeply excised with fused fork-sclerite. Penis trunk not shorter than tegmen. Female. Ovopositor with more or less distinct valvifer and coxite with styli, but inner and outer lodes not isolated. Diagnosis. — Taenioncus gen. n. occupies an intermediate position between Nitidulinae (Epuraea genera-complex, in particular allies of Haptoncus) because of its structure of the abdominal tip, especially the position of the anal sclerite and, on the other hand, Carpophilinae (Carpophilus genera-complex) in its body shape, exposed last abdominal tergites, convex venter, legs and antennae. It is likely to have many symplesiomorphies and it is best regarded as a group as a whole hardly modified from its possible ancestors of Carpophilinae. I think this genus must be treated as an archaic member of the latter subfamily.