Stethantyx sanjosea Khalaim et Broad

Khalaim, Andrey I. & Broad, Gavin R., 2013, Tersilochinae (Hymenoptera: Ichneumonidae) of Costa Rica, part 2. Genera Megalochus gen. nov. and Stethantyx Townes, Zootaxa 3693 (2), pp. 221-266 : 261-263

Stethantyx sanjosea Khalaim et Broad , sp. nov.

( Figs 10 , 13 , 50 , 53, 54 )

Comparison. Differs from other species of Stethantyx by the combination of its black flagellum, orange head (frons and vertex sometimes fuscous centrally) ( Fig. 13 ), and narrow, anteriorly widened basal area of the propodeum ( Fig. 53 ). Stethantyx cacaoensis sp. nov. also has a predominantly orange head and similar propodeal areolation but in this species the frons and anterior part of the vertex are blackish and the ovipositor is much longer. Stethantyx limona sp. nov. has similar propodeal areolation but has the head almost entirely black with only the clypeus yellowish orange, a darker hind leg and somewhat longer ovipositor.

Description. Female. Body length about 6.75 mm. Fore wing length 4.65 mm.

Head strongly rounded behind eyes in dorsal view; temple half as long as eye width. Mandible with upper tooth much longer than lower tooth. Clypeus broad, lenticular, flat or very weakly convex in lateral view, mostly smooth, densely punctate on its upper 0.6. Malar space about 0.6× as long as basal width of mandible. Flagellum of antenna usually with 25–31(34) flagellomeres (31 flagellomeres in holotype), all flagellomeres slightly elongate. Inner eye orbits hardly convergent ventrally. Face weakly prominent centrally. Face, frons, vertex and temple finely granulate, dull, densely and mostly indistinctly punctate.

Notaulus as very small inconspicuous tubercle distant from anterolateral margin of mesoscutum, or completely absent ( Fig. 50 ). Mesoscutum finely granulate, finely and densely punctate. Scutellum with lateral longitudinal carinae extending from its base to about midlength ( Fig. 50 ). Foveate groove of mesopleuron situated in anterior 0.6 of mesopleuron, oblique, moderately deep, crenulate, not reaching anterior margin of mesopleuron ( Fig. 54 ). Mesopleuron finely granulate (almost smooth above foveate groove) and finely punctate. Propodeum granulate, dorsolateral area very finely and densely punctate, without wrinkles adjacent to carinae. Basal area of propodeum long and narrow, distinctly widened anteriorly, about half as long as apical area ( Fig. 53 ), basal longitudinal carinae strong posteriorly but weak or vanishing anteriorly ( Fig. 53 ). Propodeal spiracle separated from pleural carina by ≤0.5× diameter of spiracle. Apical area flat, anteriorly pointed or narrowly rounded.

Fore wing ( Fig. 10 ) with veins Rs +2 r and Rs angled about 115°. Vein 2 rs-m 1.7× as long as abscissa of M between 2 rs-m and 2 m-cu. Hind wing with cu 1& cu-a slightly inclivous or vertical. Hind femur 5.5× as long as broad, 0.86× as long as tibia.

First tergite slender, 4.2× as long as posteriorly broad, mostly smooth, with petiole laterally shallowly striate or coriaceous. Glymma situated near middle of tergite 1, small, joining by shallow furrow to ventral part of postpetiole. Second tergite 2.28× as long as anteriorly broad. Thyridial depression more than 4.0× as long as broad. Ovipositor weakly upcurved, with shallow dorsal subapical depression; sheath almost 1.8× as long as first tergite and 1.62× as long as hind tibia.

Head and mesosoma reddish orange; face yellowish orange ( Fig. 13 ); clypeus, malar space, palpi, mandible (teeth black), propleuron and anterior margin of pronotum yellowish. Antenna black, scape and pedicel ventrally brownish. Tegula fuscous. Pterostigma brown to dark brown. Legs yellowish orange to brownish orange, fore (sometimes also mid) coxa and trochanters whitish. Metasomal segment 1 dark brown, sometimes petiole brownish orange. Metasoma behind tergite 1 yellow ventrally, tergites 2 and 3 dorsally black with narrow yellowish bands posteriorly, tergites 4+ brown with posterior yellowish marks.

Male. Flagellum of antenna with 24–29 segments.

Variation. This species is rather variable in size and sometimes has the frons, vertex and mesosoma dorsally infuscate. The ovipositor sheath varies from 1.4 to 1.9× as long as the first tergite. Two females from Braulio Carrillo National Park have 34-segmented antennal flagella (25–31 flagellomeres in other material); one of them also has an unusually broad basal area of the propodeum and is not included in the type series.

Etymology. Named after the type locality, San José province of Costa Rica.

Material examined. Holotype female (BMNH), San José Prov., Zurquí de Moravia, on edge of Braulio Carrillo National Park, 1600 m, X–XII.1990, coll. I.D. Gauld.

Paratypes. Alajuela Prov.: 1 Ƥ (BMNH) Finca San Gabriel, 2 km W of Dos Ríos, 600 m, VI.1988, coll. I.D. Gauld & P. Mitchell. 1 Ƥ (MUCR) same data, but VIII.1988, coll. P. Hanson. 1 Ƥ (BMNH) Guanacaste National Park, Estación Pitilla, 680 m, VI.1988, coll. I.D. Gauld & P. Mitchell. 1 Ƥ (INBio) Sector Cerro Chato, 1100 m, IX–X.1997, coll. G. Carballo. 15 Ƥ (INBio) National Park Volcán Tenorio, N of volcano Tenorio, Guatuso, 1500– 1600 m, V–VII.2005, coll. J.A. Azofeifa. 2 Ƥ (INBio) National Park Volcán Tenorio, Estación El Pilón, 1.5 km SW of Cerro Carmela, 700–800 m, VI–VII.2006, coll. J.A. Azofeifa. 1 Ƥ (INBio) same data, VIII–IX.2006. 1 3 (INBio) National Park Volcán Tenorio, Río Roble, 1000–1100 m, VI–IX.2006, coll. J.A. Azofeifa. Guanacaste Prov.: 2 Ƥ (BMNH) Guanacaste National Park, Derrumbé, volcano Cacao, 1300 m, X–XII.1988, coll. I.D. Gauld & D. Janzen. 1 Ƥ (BMNH) Guanacaste National Park, Cerro Pedregal, W of volcano Cacao, 1000 m, II–III.1989, coll.

I.D. Gauld. 1 Ƥ (BMNH) Guanacaste National Park, Estación (Casa) Maritza, volcano Orosi, 560 m, V.1988, coll. I.D. Gauld & P. Mitchell. 2 Ƥ (BMNH) same data, but X.1988. Guanacaste National Park, Estación Pitilla, 680– 700 m, coll. I.D. Gauld: 1 Ƥ (MUCR) IX.1988, 1 Ƥ (ZISP) IV.1989, 1 Ƥ (BMNH) V.1989. Guanacaste National Park, 9 km S of Santa Cecilia , 700 m, 1992, coll. Moraga: 2 Ƥ (INBio) I, 3 Ƥ (INBio) III, 2 Ƥ (INBio) X. 3 Ƥ (INBio) Guanacaste National Park, Estación Mengo (=Cacao), SW of volcano Cacao, 1000–1400 m, V–VI.1991. 1 Ƥ (INBio) same data, but VIII.1991, coll. D.G. García. 1 Ƥ (INBio) Sector San Ramón, 4.5 km WSW of Dos Ríos de Upala, 720 m, VI–VII.1996, coll. F.A. Quesada & D. Briceño. 1 Ƥ (INBio) Las Pailas, 2.75 km S of Cerro Braun, 1250 m, VI.1996, coll. O. Espinoza & G. Sihezar. 2 Ƥ (INBio) Las Pailas, 6 km S of Cerro Braun, 800 m, IV.1996, coll. A. Masís. 2 Ƥ (INBio) Macizo Miravalles, Estación Cabro Muco, 1100 m, IX–X.2003, coll. J.A. Azofeifa. 1 3 (ZISP) same data, but VI–VII.2003, coll. J.A. Azofeifa et al. 1 Ƥ (INBio) La Cruz, Estación (Casa) Maritza, 600 m, IX.1996, coll. C. Zuñiga. Heredia Prov.: 1 Ƥ (BMNH) La Selva Biological Station, 50 m, II.1991, coll. J.S. Noyes. 2 Ƥ (BMNH) La Selva Biological Station, 3 km S of Puerto Viejo, 10º26ʹ N, 84º01ʹ W, primary rain forest, V.1988, coll. B.V. Brown. 1 Ƥ (BMNH) same data, but secondary forest. Chilamate, Selva Verde, 75 m, coll. I.D. Gauld: 1 Ƥ (BMNH) IX–X.1989, 1 Ƥ (ZISP) XI.1989, 2 Ƥ (BMNH) XII.1989 – III.1990. 1 Ƥ (BMNH) Braulio Carrillo National Park, 9.5 km E of El Tunel, 1000 m, IV–V.1989, coll. I.D. Gauld. 1 Ƥ (INBio) La Selva Biological Station, 10º26ʹ N, 84º01ʹ W, 50–150 m, III.1993. Puntarenas Prov.: 2 Ƥ (MUCR) San Vito, Biological Station Las Alturas, 1500 m, VI.1992, coll. P. Hanson & C. Godoy. 1 Ƥ (INBio) same locality, III–V.1992, coll. F. Araya. 1 Ƥ & 1 3 (INBio) same locality, V.1992, coll. M. Ramirez. 1 Ƥ (INBio) Buenos Aires, Estación Altamira , Cerro Biolley, 1766 m, V–VI.2000, coll. D. Rubí. 1 Ƥ (INBio) same data, but VIII–IX.2001. 1 Ƥ (INBio) Biological Reserve Monteverde, 1520 m, IX.1993, coll. N. Obando. 1 Ƥ (INBio) Biological Reserve Monteverde, San Luís, 1040 m, VII.1992, coll. Z. Fuentes. 1 Ƥ (INBio) 1.4 km NE of Escuela Progreso, 1180 m, I.1996, coll. M. Chinchilla. 2 Ƥ (INBio) path to Cerro Pittier, 600 m NW of Estación Pittier, 1750 m, VII.1996, I.1998, coll. M. Moraga. 1 Ƥ (INBio) Sendero Altamira , 900 m NW of Estación Pittier, 1700 m, V.1996, coll. A.M. Maroto. 1 Ƥ (INBio) 4.2 km SW of Cerro Gemelo, Estación Pittier, 1670 m, VI.1996, coll. A.M. Maroto & R. Mora. Cartago Prov.: 1 Ƥ (INBio) Refugio Nacional de Fauna Silvestre, National Park Tapantí, 1250 m, XI.1991, coll. G. Mora.

Non-type material. Heredia Prov.: 1 Ƥ (BMNH) Braulio Carrillo National Park, 9.5 km E of El Tunel, 1000 m, V–VI.1989, coll. I.D. Gauld.

Distribution. Costa Rica ( Alajuela , Cartago, Guanacaste, Heredia , Puntarenas, San José).

Figures

FIGURES 7 – 10. Wings of Stethantyx spp., Ƥ: 7 — S. orosia sp. nov.; 8 — S. propodeator sp. nov.; 9 — S. puntarenasa sp. nov.; 10 — S. sanjosea sp. nov.

FIGURES 11 – 15. Stethantyx alajuela sp. nov., Ƥ: 11 — head, frontal; 14 — whole insect without wings, left. Stethantyx heredia sp. nov., Ƥ: 12 — head, frontal. Stethantyx sanjosea sp. nov., Ƥ: 13 — head, frontal. Stethantyx propodeator sp. nov., Ƥ: 15 — head, mesosoma and first metasomal segment, left.

FIGURES 47 – 52. Stethantyx punarenasa sp. nov., Ƥ: 47 — mesosoma, left; 48 — mesoscutum and scutellum, dorsal; 49 — propodeum, dorsal. Stethantyx sanjosea sp. nov., Ƥ: 50 — mesosoma, dorsal. Stethantyx cartagoa sp. nov., Ƥ: 51 — mesosoma, left; 52 — propodeum, dorsal. Scale bars = 0.1 mm.

FIGURES 53 – 55. Stethantyx sanjosea sp. nov., Ƥ: 53 — propodeum, dorsal; 54 — mesosoma and hind leg, left. Stethantyx limona sp. nov., Ƥ: 55 — propodeum, dorsal. Scale bars = 0.1 mm.