Revision of Megabeleses Takeuchi (Hymenoptera, Tenthredinidae) with description of two new species from China Author Wei, Meicai text Zootaxa 2010 2729 36 50 journal article 46902 10.5281/zenodo.200135 3eb13a9b-3380-4828-aca8-6a8569f00f07 1175-5326 200135 Megabeleses tsurugiensis Togashi, 2008 ( Figs. 30–38 ) Megabeleses tsurugiensis Togashi, 2008 : 10 , Ƥ, type locality: Japan , Honshu, Ishikawa Prefecture, Hakusan-shi, Tsurugi-hizumecho, foot of Mt. Uwanai. Description. Holotype : Ƥ. Body length 13 mm ( Fig. 30 ). Black, without any metallic tinge; fore tibia and tarsus largely, extreme base of middle tibia, middle tarsus largely pale brown; posttergite, a quadrate macula on outer side of hind coxa, hind trochanter partly, basal 3/7 of hind femur yellow white; palpi blackish brown. Wings subhyaline, faintly infuscate, stigma and veins black brown. Body hairs and setae on sheath silver brown. FIGURES 30–38. Megabeleses tsurugiensis Togashi, 2008 . 30. Adult, female; 31. Head, dorsal view; 32. Clypeus; 33. Microsculpture on abdominal tergites; 34. Mesoscutellum and posttergite; 35. Hind tarsus; 36. Apical sheath, lateral view; 37. 10th serrula; 38. Labels of holotype. Head coarsely punctured, bottoms of middle and lateral fovea feebly polished, temple and postocellar area somewhat sparsely punctured, interspaces somewhat shiny; lateral lobe of pronotum coarsely punctured; mesonotum including posttergite densely punctured, posterior 2/3 of prescutum, top of scutum, depressed part of mesoscutellum less densely punctured, interspaces shiny, parapsis microsculptured; elevated area of metanotum behind cenchri coarsely punctured, metascutellum densely microsculptured, without isolated punctures; lateral part of propleuron very sparsely and ventral part densely punctured; upper half of mesepisternum and dorsal margin of mesepimeron coarsely punctured, ventral half of mesepisternum sparsely punctured with distinct shiny interspaces, other part of mesepimeron microsculptured; ventral part of metepisternum very sparsely punctured, strongly shiny, upper margin of metepisternum and of metepimeron densely punctured, central area of metepimeron coriaceous; outer side of hind coxa densely punctured; posterior side of each coxa impunctate, strongly shiny. Abdominal tergites impunctate, distinctly microsculptured ( Fig. 33 ); lateral sides of ovipositor sheath polished, shiny. Anterior margin of clypeus shallowly and angularly incised for about 1/6 clypeus length ( Fig. 32 ); malar space hardly shorter than radius of ocellus; closest distance between eyes 1.4× height of eye; distance between antennal sockets as long as distance between antennal socket and eye; middle fovea round, distinct, clearly deeper than frontal basin; frontal walls obtuse; circular furrow of anterior ocellus distinct, postocellar and interocellar furrows obscure; postocellar area distinctly elevated, 1.3× broader than long, middle furrow faint; lateral furrows broad and shallow, distinctly divergent backwards; lateral margins of head behind eyes in dorsal view about 0.6× length of eye, distinctly enlarged ( Fig. 31 ). Antenna about as long as thorax and abdomen together, third antennomere 1.05× length of fourth antennomere. Mesoscutellum slightly broader than long, anterior corner roundly protruding, obtuse, anterior furrow of mesoscutellum triangularly bent, posterior margin without distinct carina ( Fig. 34 ); posttergite without middle carina, apical margin round; distance between cenchri about 1.65× width of a cenchrus; dorsal lobe of metepimeron long and narrow (cf. Fig. 46 ). Length of inner margin of 1st abdominal tergite about 1/3 length of widest lateral length. Apex of hind coxa reaching anterior margin of fourth sternite, hind tibia with a long and distinct longitudinal furrow on outer side, apex distinctly thickened; inner spur of hind tibia about 1/4 length of hind basitarsus; hind basitarsus 4× longer than broad, strongly thickened with constricted base, 1.3× as long as tarsomeres 2–5 together ( Fig. 35 ), outer side with a shallow but distinct furrow. Vein cu-a close to but not interstitial to vein 1M, R+M distinct, 2r weakly bent at middle and meeting cell 2Rs at apical 3/7, 2m-cu not interstitial to 1rm; petiole of hind anal cell about half length of cu-a. Ovipositor sheath about 0.92× lengths of middle tibia, apical sheath 1.4× lengths of basal plate, apex narrowly rounded in lateral view ( Fig. 36 ); apical sheath in dorsal view triangular, basal width 3.5× width of cercus; setae on lateral sides of apical sheath about as long as diameter of middle ocellus; cercus 3× as long as broad. Lancet with 24 flat serrulae, middle serrulae each with about 20 subbasal teeth ( Fig. 37 ); medial breadth of membranous lobe of lance 0.65× medial width of lance. FIGURES 39–50. Megabeleses spp. 39–41. Mesoscutellum and posttergite, dorsal view; 42. Mesoscutellum and posttergite, lateral view; 43–46. Metepimeron; 47–50. 10th serrula. 39, 43, 49, M. xiaoi ; 41, 42, 44, 50, M. magnoliae ; 40, 45, 48, M. liriodendrovorax ; 46, 47, M. crassitarsis . Male: Unknown. Distribution. Japan (Ishikawa) ( Fig. 51 ). Specimen examined. 1Ƥ, holotype , “Kin Ken gu, Tsurugi-machi, Ishikawa Pref., 16. V. 2007 , I. Togashi leg.”; “ Holotype , Megabeleses tsurugiensis sp. nov. ” ( Fig. 38 , NMNS, lance and lancet removed from specimen into a slide, no. NSMT I-Hym 62144). Host plant. Unknown. Remarks. See the above key for differences between M. tsurugiensis and other known species of the genus.