A new species of Rileya Ashmead (Hymenoptera: Eurytomidae) from Brazil associated with Zalepidota Rübsaamen (Diptera: Cecidomyiidae) Perioto, Nelson Wanderley Lara, Rogéria Inês Rosa Cid Maia, Valéria Revista Chilena de Entomología 2020 Rev. Chil. Entomol. 2020-03-27 46 1 97 103 Perioto and Lara Perioto and Lara 2020 [444,819,157,181] Insecta Eurytomidae Rileya Animalia Hymenoptera 2 99 Arthropoda species priscillae sp. nov.  ( Figs. 1-15)   Type material.  Holotype ♀[MZUSP] labeled “ BRAZIL, SP, Luiz Antônio\ Estação Ecológica de Jataí\ 21°37’25.3”S/ 47°48’25.4”W\ riparian forest \  12 / II / 2009\ NW Periotoand team, legs.”; “ex.  Zalepidotasp.( Diptera, \ Cecidomyiidae) gall in an \ unidentified plant”; “HOLOTYPE \  Rileya\  priscillae sp. n.\ Perioto & Lara”.  Paratypes: same data as holotype, 8 ♀♀and 1 ♂[ MZUSP],  6 ♀♀[ LRRP, # 19341-19346]. The holotypeand paratypesexamined are in good condition; holotypeleft wings mounted between coverslips. Additional specimens: same data as holotype, 3 ♀and 1 ♂[dissected to scanning electron microscopy, LRRP, #19947].   Etymology.This species is named after Priscilla Yoshi Serapião Hashimoto, cousin of the first author.   Diagnosis.Related to  R. hegeliGirault,1916and  R. pallidipes(Ashmead, 1894), from which it can be separated as follow: forewing with stigma not enlarged and Gt 3asetose ( vs.forewing with stigma swollen, circular or ovate and Gt 3with short, transverse row of 2-4 setae subdorsally as in  R. hegeli); head subtriangular, postorbital carina present, midlobe of mesoscutum about 0.8× as long as broad and color reddish brown with blackish brown areas on head, dorsum of propodeum, mesoscutum, axillae and, Gt 1-3and Gt 4-6( vs.head subovate, postorbital carina absent, midlobe of mesoscutum about 1.3× as long as broad and color light to dark brown as in  R. pallidipes).   Description. Holotypefemale ( Figs. 1-2). Body length 2.8 mm. Color: mainly body reddish brown except by: blackish brown on head, dorsum of propodeum, 2/3 anterior of mesoscutum, axillae, dorsal central portion Gt 1-3and Gt 4-6; golden on: legs, tegula and scape. Wing hyaline, venation light brown. Head: subtriangular in frontal view, with few striae radiating from clypeus toward lower eye margin, face and frons with interstices finely reticulate ( Fig. 3). Clypeus bilobate ( Fig. 4); supraclypeal area at same level of remainder of face. Malar space 0.5× eye height, postorbital carina present ( Fig. 5). Eye glabrous. Scrobal depression deep, margined ( Fig. 3). Antenna ( Fig. 6): scape 4.0× as long as broad, broadest basally; anelli transverse, A 1-3shorter than long; F1 1.2×, F2 1.0×, F3-4 0.9×, F5 0.8× as long as broad; clava 1.8× as long as broad, segmented, tapering apically. Mesosoma( Figs. 7-8): foveate reticulate. Midlobe of mesoscutum 0.8× as long as broad, notaulus complete, posteriorly faint. Mesoscutellum as long as broad, crudely carinate apically; lateral panel of axilla sparsely setose, imbricate. Mesepisternum and mesepimeron granulate with transverse and coarse striae. Propodeum carinate, with median panel granulate between carinae; median carina present in the posterior third; primary costula transversely oriented, incomplete medially, turning to intercept dorsellum submedially; four complete carinae connecting the primary costula to nucha; secondary costula absent; spiracle obliquely oriented, reniform, ~1.0× its length from dorsellum ( Fig. 9). Forewing ( Fig. 10) 2.4× as long as broad, stigma not enlarged and 0.4× as long as stigmal vein, marginal vein 1.1× as long as postmarginal vein, completely setose. Metasoma( Figs. 11-12). Petiole barely visible in dorsal view, transverse. Gaster not laterally flattened. Gt 1-2smooth, 2/3 basal of Gt 3imbricated, with sculpturation becoming faint toward the apical margin, remaining terga reticulate; Gt 1–3glabrate, foreshortened; Gt 12.0× as long as Gt 2and 1.3× as long as Gt 3, Gt 1-30.6 as long as Gt 4; Gt 1-3glabrate, Gt 4-7+8setose; Gt 5not emarginate to expose Gt6 spiracle; Gt 7+8triangular in dorsal view. Variation: body length 2.8-2.9 mm. Malar space 0.5-0.6× eye height. Scape 3.9-4.0× as long as broad, F1 1.1-1.3×, F2 0.9-1.1×, F3-4 0.9-1.1×, clava 1.8-2.1× as long as broad. Midlobe of mesoscutum 0.7-0.8× as long as broad. Mesoscutellum 1.0-1.1× as long as broad. Stigma 0.4-0.5× as long as stigmal vein, marginal vein 1.0-1.2× as long as postmarginal vein. Gt 12.0-2.5× as long as Gt 2and 1.2-1.3× as long as Gt 3, Gt 1-30.6-0.7× as long as Gt 4.  Male( Figs.13-15). Length 2.5-2.8 mm. Very similar to female, except as follows: F1 1.3-1.5×, F2 1.0-1.2×, F3-4 1.1×, F5 1.0× and, clava 2.7-2.9× as long as broad; petiole visible in dorsal view, 0.9-1.0× as long as broad, granulate and longitudinally rugose ( Fig. 15). Gt 5distinctly emarginate to expose Gt 6spiracle, Gt 7+8hemispherical in posterior view.   Species identification.In the key provided by Gates (2008)this species runs to couplet 32’ and can be separated by an additional couplet as follows: 32’(31). Gt 3asetose. Forewing with stigma never enlarged. - Color light to dark brown [some females with darker dorsal spot on gaster, Fig. 251 in Gates, 2008]. Head subovate. Postorbital carina absent. Midlobe of mesoscutum about 1.3× as long as broad ….....................................................................  Rileya pallidipes(Ashmead, 1894) - Color mainly reddish brown, blackish brown on head, dorsum of propodeum, anterior two-thirds of mesoscutum, axillae, dorsal central portion of Gt 1-3and Gt 4-6( Figs. 1-2, 13). Head subtriangular ( Fig. 3). Postorbital carina present ( Fig. 5). Midlobe of mesoscutum about 0.8× as long as broad ( Fig. 8) ...................……  Rileya priscillaePerioto and Lara  sp. nov.   Distribution. BRAZIL, São Paulo state( new record).   Biology.Reared from galls of  Zalepidotasp.( Diptera: Cecidomyiidae) in an unidentified plant species.   Comments.The genus  Zalepidotais, for the first time, confirmed as a host of  Rileya.  Rileyais, for the first time, reported to state of São Paulo, Brazil. 5182909302 2009-02-12 NW Perioto Brazil -21.623695 Estacao Ecologica de Jatai 1 -47.807056 Luiz Antonio 2 99 1 1 SP holotype 5182909303 2009-02-12 MZUSP NW Perioto Brazil -21.623695 Estacao Ecologica de Jatai 1 -47.807056 Luiz Antonio 2 99 9 8 1 SP paratype 5182909301 [714,1043,381,405] 2009-02-12 LRRP NW Perioto Brazil -21.623695 Estacao Ecologica de Jatai 1 -47.807056 Luiz Antonio 2 99 6 6 SP paratype