Syleter Andrewes, 1941

Balkenohl, Michael, 2021, Revisiting the Oriental genus Syleter Andrewes, 1941 (Coleoptera: Carabidae: Clivinini), Revue suisse de Zoologie 128 (2), pp. 357-374 : 358-360

Genus Syleter Andrewes, 1941

Psilus Putzeys, 1877 : XLVI. – Andrewes, 1929: 386. [invalid junior homonym of Psilus Panzer, 1801 (Hymenoptera) ]

Syleter Andrewes, 1941: 317 .

Type species: Psilus acutipalpis Putzeys, 1877 , by monotypy; type locality: Bangkok.

Genus diagnosis: Size 2.8 to 4.5 mm. Head with clypeus and frons conspicuously elongated and flattened anteriorly; clypeus, clypeal wing, and supraantennal plate fused; clypeus straight or slightly convex anteriorly, projecting as far as clypeal wing; mandible distinctly elongated, narrow in apical half, laterally straight, hooked at apical tip; labrum three- or sevensetose; maxillary palpomere extraordinarily narrowed and slender in apical half, gently curved concavely outwards, the two apical segments longitudinally securiform; antenna with scapus and pedicellus eccentrically attached; eye not reduced. Mentum distinctly elongated, with lateral lobe acutely projecting, median tooth wide, truncated, not projecting as far as lateral lobe, surface with rough meshes. Pronotum distinctly trapezoid, with reflexed lateral margin complete, running from anterior angle up to basal constriction, posterior angle with obtuse small tooth which is crossing the lateral channel and pointing anteriorly, lateral channel of equal width, median line distinct, joining and engraved up to basal constriction; proepisternum invisible in dorsal view; flange at base convex, two to four times as wide as basal constriction. Elytron with interval eight convex, lateral channel slightly flared apically, with interval eight not or slightly emarginated and row of umbilical setigerous punctures indistinctly following the emargination, interval eight at apex convex or with emarginated carina; with row of umbilical setigerous punctures apically slightly oriented to interval eight; third interval with three setigerous punctures. Hind wings fully developed. Legs in both sexes with front tarsomeres distinctly widened, intermediate tarsomeres moderately widened; widening in males more distinct and ventrally with small whitish setae; mesotibia with four setae laterally, preapical seta arising from small protuberance ( Fig. 4 ). Male genitalia with aedeagus conspicuously curved, apical part elongated, apex more or less spatulate or securiform; parameres conspicuously asymmetric. Female genitalia with coxostylus one and two not completely fused, with cone-like seta in apical quarter.

Differential diagnosis: See key to the genera.

Figures

Figs 4-6. Right mesotibia. (4) Syleter paradoxus (Putzeys, 1868) showing the small preapical protuberance and its seta inserted apically (arrow). (5) Parasyleter doriae (Putzeys, 1873) comb. nov. with no tubercles at all. (6) Clypeuspinus validus (Andrewes, 1936) comb. nov. showing the long protuberance and its seta inserted laterally (arrow).