Review and key to Nearctic Lathrolestes Förster (Hymenoptera: Ichneumonidae), with special reference to species attacking leaf mining tenthredinid sawflies in Betula Linnaeus (Betulaceae) Author Reshchikov, Alexey V. Author Soper, Anna Author Van, Roy G. text Zootaxa 2010 2614 1 17 journal article 10.5281/zenodo.197875 37700ed7-18f8-43ef-9252-c3ea87907bc2 1175-5326 197875 Lathrolestes barroni Reshchikov sp. nov. Description. Female. Body length 4.0–5.0 mm. Antennal flagellum with 27 articles. Width to length ratio of scapus 0.53. Head narrowed behind the eyes, mat. Maximal length of temple to transverse eye diameter ratio 0.63; minimal length of temple to transverse eye diameter ratio 0.43. Face as wide as longitudinal eye diameter; in profile convex, with bulge. Clypeus separated from face by transverse impression; at apex projecting slightly anteriorly; apical margin of clypeus moderately thick. Clypeal foveae small. Malar space as wide as 0.27 of basal mandible width ( Fig. 54 a). Occipital carina complete, not interrupted above. Lower mandible tooth longer than upper. Mesosoma . Notaulus shallow, impressed at base. Mesosoma very wide, protruding laterally. Lower part of mesopleuron without punctures, mat, meshed. Tarsal claws pectinate ( Fig. 42 ). Hind tarsus article length ratio: 9:4:3:2:3. Forewing with areolet petiolate. Second recurrent vein with a single bulla. Nervellus intercepted below middle. Nervulus interstitial or slightly postfurcal. Propodeal carinae complete ( Fig. 32 ). Area superomedia as long as wide. Metasoma . Shiny. First metasomal tergum width to length ratio 0.7; with shallow median longitudinal impression; bordered by lateral and median longitudinal carinae. Ovipositor straight, stout dorsally, without notch ( Fig. 2 ). Color . Face, malar space, temple, base of antenna ( Fig. 54 a), tegulae, edges of propleuron and lower part of mesopleuron, scutellum, fore and middle legs, hind coxa and femur, hind margin of metasomal tergum, metasomal tergum 3–6 laterally, 8th metasomal tergit yellow ( Fig. 54 b). Remainder black. FIGURES 1–20. Apex of gaster, showing last tergum and sternite, ovipositor and sheaths. Scale 0.50 mm. 1, L. syringe* Reshchikov ; 2, L. barroni* Reshchikov ; 3, L. fissus* Reshchikov ; 4, L. thomsoni* Reshchikov ; 5, L. soperi* Reshchikov ; 6, L. scutellatus (Ashmead) ; 7, L. breviremus Barron ; 8, L. planus Barron ; 9, L. platynus (Davis) ; 10, L. clavipes Barron ; 11, L. euryremus Barron ; 12, L. protenus Barron. ; 13, L. tomostethi (Cushman) ; 14, L. erugatus Barron ; 15, L. ensator (Brauns) ; 16, L. caudatus (Thomson) ; 17, L. constrictus (Provancher) ; 18, L. profenusae Barron ; 19, L. ochraceus Barron ; 20, L. carinatus Barron. (*) Holotype. FIGURE 21–40. 21–30. Apex of gaster, showing last tergum and sternite, ovipositor and sheaths. Scale 0.50 mm. 21, L. bulbus Barron ; 22, L. periclistae Barron ; 23, L. luteolator (Gravenhorst) ; 24, L. mnemonicae (Rohwer) ;. 25, L. aquilus Barron ; 26, L. convexus Barron ; 27, L. gibbosus Barron ; 28, L. pictus Cushman ; 29, L. protrusus Barron ; 30, L. truncatus (Provancher) . Figures 31–36. Propodeum, dorsal view. 31, L. syringe* Reshchikov ; 32, L. barroni* Reshchikov ; 33, L. fissus* Reshchikov ; 34, L. thomsoni* Reshchikov ; 35, L. soperi* Reshchikov ; 36, L. zeugophorea Barron ; Figures 37– 40. First metasomal tergum: 37, L. fissus* Reshchikov ; 38, L. thomsoni* Reshchikov ; 39, L. soperi* Reshchikov ; Male subgenital plate: 40, L. fissus* Reshchikov. (*) Holotype. Comments. This species differs from the closely related L. syringe Reshchikov sp. nov. by ovipositor being stout dorsally ( Fig. 2 ); mesosoma rather wider, with projecting mesopleuron; area superomedia as long as wide ( Fig. 32 ); 2nd metasomal tergum transverse, with smooth and shiny surface. Ovipositor without notch ( Fig. 2 ) as distinct from L. scutellatus ( Ashmead, 1890 ) . Etymology. Named in honor of John Barron, Canadian researcher, who described many species of the family Ichneumonidae and previously revised the genus Lathrolestes . Host. Unknown Distribution. Canada : Quebec, Ontario Type material examined. Holotype , female, Hull, Quebec, Canada , 10.viii.1965 , ( CNC ); Paratypes : female, St. Lawrence Is. Nat. Park Ontario, Canada , 01.ix.1976 , A. Carter ( CNC ).