Labena lachryma Gauld, 2000

Marinho, Luana S. & Fernandes, Daniell R. R., 2025, Taxonomy of Labena Cresson, 1864 (Hymenoptera: Ichneumonidae: Labeninae) from Brazil, with description of two new species, Zootaxa 5660 (1), pp. 1-52 : 40-41

Labena lachryma Gauld, 2000

Figs. 48–49

Labena lachryma Gauld, 2000: 374 . Yu et al. 2016 [database on flash-drive]; Holotype ♀ Costa Rica (INBio) [original designation]

Examined material (1♀). BRAZIL, Amazonas, Manaus, / WWF [World Wildlife Fund], Reserva 1210, / 22.XI.1984, Malaise / Rede Central Leste , Bert Klein (1♀, INPA) .

Diagnosis. This species can be distinguished from other Neotropical Labena species by a combination of the following characters: propodeum with area superomedia large and square; mesopleuron and metapleuron with inverted U-shaped black spot; mandibles longer and finer than in other species.

Remarks. Additional characters from the material examined from the states of Amazonas ( Brazil). Body length 15 mm, except ovipositor. Overall coloration is pale yellow ( Figs. 48A–D ). Head ( Figs. 48B–C ). Transverse brown band between the occipital carina and the occiput, wider centrally; Transverse black stripe on ocelli, extending to the front side. Antenna with 34 flagellomeres, measuring 10.9 mm; flagellum dark brown, flagellomeres I and II completely dark brown. Mandible bidentate with striate base, upper tooth much larger than lower tooth; mandible basal width 0.32 mm. Malar space width 0.17 mm. Ocellus diameter 0.75 mm; distance between anterior and posterior ocellus of 0.09 mm; shortest distance between posterior ocellus and compound eye of 0.18 mm; distance between the posterior ocelli of 0.16 mm. Compound eye length 2.09 mm. Frons flat, smooth without setae, width 1.18 mm. Face slightly striate width 0.86 mm. Wing. Fore wing length 13.58 mm, hyaline with a light brown spot at the apex; areolet shorter than long of the distal abscissa of M, with 3rs-m slightly less than 2rs-m. Hind wing with a length of 9.08 mm. Mesosoma ( Fig. 48E ). Mesoscutum without black border, with three longitudinal black bands. Pronotum without epomia, with upper posterior part punctate and with sparse setae. Propleuron punctate and with dense setae. Scuto-scutellar groove black, deep and smooth. Scutellum very convex, punctuate with sparse setae, completely yellow. Metanotum completely pale yellow. Propodeum anterior part without transverse band; area basalis rectangular, wider than long completely brown; area externa longer than wide, without spot; area dentipara without spot, confluent with area postero-externa; area postero-externa without spot; area petiolaris obliterated by lateromedian longitudinal carina, without black upper part; area superomedia very longer than wide, anterior transverse carina weakly outlined and posterior transverse carina absent; lateral longitudinal carina complete. Fore legs with one tibial spur, tarsomeres with fringe of apical setae; mid legs with the medially undilated tibia, with two tibial spurs, without scattered slender setae on the outer surface; hind legs slender, not medially dilated, with darker tibia and tarsomeres, with two tibial spurs. Metasoma. Tergite I 2.43 mm in length, basal width 0.53 mm and apical width 0.85 mm; tergite II 1.80 mm in length, basal width 0.95 mm and apical width 1.56 mm; tergite III 1.36 mm in length, basal width 1.44 mm and apical width 1.69 mm. Metasoma yellow with dark brown tergites V–VII. Ovipositor laterally compressed, tapering apex, with marked pre-apical longitudinal carina; upper and lower valve with transverse striae.

Distribution. Costa Rica, Brazil ** (Amazonas*) ( Fig. 49 ) (Gauld 2000; Yu et al. 2016).

Discussion. Labena lachryma is morphologically similar to the other species of the genus in having mesoscutum smooth to punctuate; propodeum generally with well-defined areolet; spiracle elliptical and elongate; metasomal insertion above the insertions of the hind coxa; fore tibia of the female is inflated; fore wing with pentagonal areole and the metasoma is quite long. However, it differs from the other species in that it has a propodeum with area superomedia large and square; mesopleuron and metapleuron with inverted U-shaped black spot; mandibles longer and slender and fore tibia of the female is slender.

Figures

FIGURE 48. A–F. Female of Labena lachryma Gauld, 2000. A. Habitus, lateral view. B. Head, dorsal view. C. Head, front view. D. Habitus, dorsal view. E. Propodeum, dorsal view. F. Apex of ovipositor, lateral view.

FIGURE 49. Distribution of Labena lachryma Gauld, 2000 (yellow star= type locality, blue triangle= previous record, red circle= new record.