Triclistus bicolor, Alvarado, Mabel & Rodriguez-Berrio, Alexander, 2013

Alvarado, Mabel & Rodriguez-Berrio, Alexander, 2013, Ten new species of Triclistus Förster, 1869 (Hymenoptera, Ichneumonidae) from Peru, with a key to Neotropical species, Zootaxa 3702 (5), pp. 401-423 : 403-405

Triclistus bicolor sp. n.

Figs 2 , 17

Holotype. F, PERU: CU, Waiqecha CCII [research center] 13o10’31.4”S / 71o34’53.3”W, 2692 m, 09.xii.2007. Malaise trap. C. Castillo Leg. ( MUSM).

Paratype. M, same data as holotype; F, same data except 22.x.2007 and F, same except 06.i.2008.

Diagnosis. Triclistus bicolor is the most distinctive species, being the only one with metasomal tergites black with lateral and posterior margins whitish cream colored. Structurally it resembles T. rivwus Gauld & Sithole , both characterized by the propodeum evenly declivous with lateromedian longitudinal and posterior transverse carinae entirely absent, tergite I dorsally smooth, without lateromedian longitudinal carina, and fore wing with no trace of vein 3rs-m, and thus without an areolet.

Description. F: Fore wing length 5.8–7.0 mm. Antenna with 30–31 flagellomeres, second flagellomere 2.7–3.0x as long as centrally broad, subapical flagellomeres elongate, 1.3–1.5x as long as centrally broad; face 1.2–1.3 as long as wide, slightly convex, granulose with sparse punctures; mandibles not twisted, tapered, with upper tooth broader and longer than lower tooth; labrum not exposed when mandibles closed; labrum not exposed when mandibles closed; clypeal margin convex; malar space 1.1–1.3x as long as basal mandibular width; lateral ocellus separated from compound eye by 1.7–1.9x ocellar diameter; head in dorsal view with genae evenly narrowed behind compound eyes, slightly rounded; gena on lateral view 1.1–1.2x as long as compound eyes; frons smooth, hairless; crest between antennal toruli sharp; genae and vertex smooth and finely punctate. Mesosoma generally smooth, polished and finely punctate; mesoscutum convex; notauli extending to centre, weak; scuto-scutellar groove deep, smooth; scutellum convex, with lateral carinae reaching to 0.3x its length; metapleuron polished, with isolated setae in posterior area, elsewhere bare; submetapleural carina scrobiculate, anteriorly expanded into a conspicuous triangular lobe; pleural carina curved in anterior half then declivous; pronotum polished with a band of hair along upper margin, mesopleuron punctate on upper, anterior, and lower margins. Propodeum quite short and evenly declivitous; without lateromedian longitudinal and transverse carinae, thus with all areas confluent, smooth but punctate on lateral margins; posterior transverse carina absent; area spiracularis + area lateralis confluent, coarsely punctate; spiracle round. Fore wing with 3rs-m absent, areolet not defined. Metasoma with tergite I triangular, 0.9-1.0x as long as posteriorly broad, lateral longitudinal carinae reaching to spiracle, lateromedian carinae absent, smooth with isolated punctures on lateral margin; tergite II mostly glabrous with setae on lateral margin, 0.5– 0.6x as long as posteriorly broad; tergite III–V similarly sculptured, tergites VI–VII similarly sculptured but with rows of setae on posterior margins.

Head extensively black except palpi cream colored, mandibles creamy brown and antenna brown. Mesosoma black with tegula creamy white; fore leg with coxa, trochanter, femur dorsally and tibia ventrally creamy white, remainder blackish brown; mid leg with coxa dorsally, trochanter, dorsal and lateral part of coxa and femur creamy white, remainder blackish brown; hind leg with dorsal side of coxa creamish but with a black spot, femur dorsally and apically creamy white, remainder blackish brown. Wings infuscate; pterostigma brown. Metasoma creamy white, tergites and laterotergites with central area black.

Male. Similar to female except as follows: malar space shorter than in female, 0.9x as long as basal mandibular width; frons slightly alutaceus; fore coxa basally brownish.

Etymology. The specific epithet is the Latin term bicolor , meaning “having two colors”, in reference to the bicolored metasomal tergites of this species.

Figures

FIGURE 2. Lateral habitus of Triclistus bicolor sp. n. paratype female

FIGURES 17 – 22. Propodeum and basal mesosoma, dorsal view; 17 Triclistus bicolor sp. n. paratype female; 18 T. cholo sp. n. paratype female; 19 T. matsiguenga sp. n., holotype female; 20 T. xodius Gauld & Sithole, paratype female; 21 T. warmi sp. n., holotype female; 22 T. castilloai sp. n., holotype female.