Revision of the strongly flattened Megaprosternum Azevedo (Hymenoptera, Bethylidae) Author Colombo, Wesley D. B9D7FDE3-BDD8-4714-A53F-640A0994E5F6 Universidade Federal do Espírito Santo, Departamento de Ciências Biológicas, Av. Fernando Ferrari 514, Goiabeiras, 29.075 - 910, Vitória, ES, Brazil. wesleycolombo@gmail.com Author Azevedo, Celso O. CD98B489-7611-4A33-AF53-3016B9DA1617 Universidade Federal do Espírito Santo, Departamento de Ciências Biológicas, Av. Fernando Ferrari 514, Goiabeiras, 29.075 - 910, Vitória, ES, Brazil. bethylidae@gmail.com text European Journal of Taxonomy 2024 2024-09-13 958 1 1 47 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2659/12299 journal article 10.5852/ejt.2024.958.2659 2118-9773 13758948 6FFE3969-D8EF-4082-9107-F98187116C28 Megaprosternum hmong sp. nov. urn:lsid:zoobank.org:act: 5DF08B7D-78EA-410D-AAFB-81D5CD5CA1FF Fig. 5 Differential diagnosis The females of this species are morphologically similar to those of M. kayin sp. nov. , by having the head at least 1.25 × and at most 1.40 × as long as wide, the antennae with 11 flagellomeres, the probasisternum strongly large with anterior margin strongly angulated and posterior margin curved, the wings fully developed, and the propodeal spiracle on dorsal surface of the metapectal-propodeal complex. However, M. hmong sp. nov. has the malar space 0.1× HE, the epicnemium with anterior margin outcurved, the equidistant distal hamuli, and the S2pa widening posterad, whereas the M. kayin has the malar space absent, the epicnemium with anterior margin straight, the non-equidistant distal hamuli, and the S2pa evenly wide. Etymology The epithet hmong is derived from the Hmong, an Asian ethnic group that inhabits various provinces of Laos , including Sayaboury. Material examined Holotype LAOS – Sayaboury Prov. • ♀ ; “Sayaboury Prov.[ince], Sayaboury, 12.XII.1965 , native collector”; BPBM . Paratype CAMBODIA • “ Central Cardamom , Osom Com. Veal Veng. Pursat , N 12º03’41.6” E 103º14’40.8”, Alt. 588m , 17-22.viii.2010 , Malaise trap . J.O. Lim leg.; SNU . Description Female MEASUREMENTS (mm). Body length 2.98; LH 0.55; WH 0.40; WF 0.25; WOT 0.09; surface of median clypeal lobe 0.09; HE 0.22; OOL 0.29; LFW 1.59. COLOR ( Fig. 5A–B ). Head, mesosoma and metasoma castaneous. HEAD ( Fig. 5C ). Oval, in lateral view; sides almost parallel, in dorsal view; malar space 0.1× HE; median clypeal lobe straight, as long as lateral ones, with pair of lateral carinae, parallel posteriorly, lobe delimitation indistinct; mandible with three apical teeth; hypostoma almost straight medially; antenna with 11 flagellomeres, pedicel longer than flagellomere I; eye glabrous, contour not protruding; frons coriaceous; ocellar triangle with anterior angle acute, postocellar line shorter than DAO. Fig. 5. Megaprosternum hmong sp. nov. , holotype, ♀ (BPBM). A–B . Habitus. A . Lateral view. B . Dorsal view. C . Head, dorsal view. D–E . Mesosoma. D . Dorsal view. E . Ventral view. Scale bars: A–B = 500 μm; C–E = 125 μm. MESOSOMA ( Fig. 5D–E ). Pronotal flange polished, with posterior margin at most 1.5× as wide as anterior one; dorsal pronotal area coriaceous, posterior margin outcurved medially, overlapping anterior area of mesoscutum; probasisternum with anterior margin strongly angulated, posterior margin curved; epicnemium with anterior margin outcurved;mesoscutum longer than mesoscutellum medially; parapsidal signum absent; transscutal fissure conspicuous; mesoscuto-scutellar suture absent; mesopleuron with mesepimeral lobe not evident, anterior mesopleural fovea absent, mesopleural epicoxal lobe not evident, mesopleural pit absent, upper mesopleural fovea absent; metapectal-propodeal disc almost as long as wide medially, without evident constriction at propodeal spiracle; transverse anterior carina absent; lateral marginal carina present; paraspiracular sulcus absent; paraspiracular carina absent; metapostnotal median carina absent; propodeal spiracle circular, on dorsal surface of the metapectal-propodeal complex; metadiscrimen absent; metafurcal pit absent; forewing with prestigmal abscissa of radial 1 subrectangular, as wide as Sc+R vein, prestigmal flexion line present, pterostigma small and circular; hind wing slender with three equidistant distal hamuli. METASOMA . S2aa with anterior margin straight; S2pa wider than long medially, widening posterad; second abdominal spiracle circular; third abdominal sternum with anterior margin outcurved; abdominal tergum narrowing apicad. Male Unknown. Host Unknown. Distribution Laos (Sayaboury Province).