Lamachus toluca Khalaim et Ruíz-Cancino, 2019

Khalaim, A. I., Ruíz-Cancino, E., Coronado-Blanco, J. M. & Castañeda-Vildуzola, Á., 2019, First record of the genus Lamachus Förster, 1869 (Hymenoptera: Ctenopelmatinae) from Mexico, with description of two new species, Russian Entomological Journal 28 (2), pp. 169-179 : 176-177

6. Lamachus toluca Khalaim et Ruíz-Cancino , sp.n.

Figs 14–19 .

MATERIAL EXAMINED. Holotype: ♀ ( UAT), Mexico, Estado de Mexico (EMex), N of Toluca, El Cerrillo, Piedras Blancas, 19°24´32´´ N, 99°41´21´´ W, 2612 m, ex Neodiprion omosus Smith on Pinus patula , 27.IX.2017, coll. Á. Castañeda-Vildózola.

Paratypes. Same data as holotype, 2 ♀♀, 3 ♂♂ (1 ♀, 1 ♂ in TAMU; 1 ♂ in UAT; 1 ♀, 1 ♂ in ZISP) .

COMPARISON. Lamachus toluca sp.n. differs from another Mexican species, L. cushmani sp.n., by its predominantly black body with some pale markings, black maxillary and labial palps, paler pterostigma, developed ventrally epicnemial carina, larger areolet in the fore wing, intercept- ed in posterior 0.45–0.5 nervellus (cu1&cu-a), and slender first metasomal segment (in both sexes). See also the key below.

DESCRIPTION. Female (holotype). Body length 9.3 mm. Fore wing length 8.6 mm.

Head strongly rounded behind eyes in dorsal view ( Fig. 17 ). Inner eye orbits slightly concave at level of bases of antennae ( Fig. 18 ). Face and frons finely granulate, dull, with moderately dense, fine but distinct punctures. Vertex and gena shallowly granulate, dull to weakly shining, with very fine punctures. Flagellum distinctly tapered towards apex, with approximately 39 flagellomeres ( Fig. 15 ). Face almost twice as broad (minimum distance between eyes) as long (measured from antennal insertions to supraclypeal furrow). Clypeus ( Fig. 18 ) about 2.9 times as broad as long, separated from face by distinct furrow, convex in upper 2/3 and transversally impressed in lower 1/3, with lower margin centrally distinctly concave; clypeus smooth, with very small, inconspicuous punctures. Malar space 0.25–0.3 times as long as basal mandibular width. Mandible robust, weakly tapered, with fine but sharp punctures on very finely granulate background in basal half, longitudinally striate in apical half; teeth polished, upper tooth somewhat longer than the lower ( Fig. 18 ). Occipital carina fine, complete. Hypostomal carina complete, joining occipital carina above the base of the mandible at distance equal to 0.6 basal mandibular width.

Mesosoma shallowly granulate, subpolished, dull to weakly shining, with fine and dense punctures; upper posterior part of mesopleuron (below speculum) sometimes with weak oblique wrinkles; punctures on propodeum mostly indistinct. Pronotum without epomia. Notaulus sharp, moderately deep, with anterior end well above lateral margin of mesoscutum. Scutellum with lateral longitudinal carinae present only at its extreme base. Epicnemial carina present laterally and ventrally, its upper ends extending somewhat above the level of the lower corner of pronotum, not reaching front margin of mesopleuron. Speculum smooth. Submetapleural carina complete, strong. Propodeum without carinae except for lateral longitudinal carinae which are represented by short strong ridges in posterior part of propodeum, and vestiges of lateral longitudinal carinae above spiracles. Pleural carina present. Propodeal spiracle round, separated from pleural carina by 0.6–1.0 times diameter of spiracle. Tarsal claws simple. Fore wing with areolet oblique, subtriangular, with short stalk above, receiving vein 2m-cu at its distal corner. Hind wing with nervellus (cu1&cu-a) intercepted in centre or somewhat below centre.

Metasomal tergites shallowly granulate, weakly polished, with very fine punctures. First tergite in dorsal view 2.6 times as long as posteriorly broad, with spiracles near its centre; lateromedian longitudinal carinae present only at extreme base of tergite; lateral longitudinal carinae completely absent; glymmae superficial. Ovipositor short, projecting beyond subgenital plate, shorter than apical depth of metasoma ( Fig. 19 ).

Colour pattern. Head black; lower part of gena and a pair of marks extending from top of eyes towards lateral ocelli ( Fig. 17 ) yellow; face yellow-marked as in Fig. 18 ; clypeus yellow centrally and pale brown to blackish peripherally ( Fig. 18 ). Mandible with basal half and teeth black, remaining brownish ( Fig. 18 ). Maxillary and labial palps brownish black. Antenna with scape and pedicel black; flagellum fuscous dorsally and brownish ventrally, with base and distal apex more or less completely black ( Fig. 15 ).

Mesosoma black with yellow markings on pronotum, mesoscutum, scutellum, postscutellum, mesopleuron, metapleuron and propodeum ( Figs 16–17 ).

Wings almost hyaline, very weakly infumate. Pterostigma brown, sometimes peripherally blackish. Legs black; fore and mid coxae yellow-marked on front and ventral sides; fore and mid femora and tibiae yellow on front sides; hind tibia with broad yellow subbasal band (as in Fig. 13 ).

Metasoma black, with posterior transverse yellow band on each tergite (pale bands broader on basal tergites and thin on posterior tergites); first tergite also yellow-marked laterally ( Fig. 19 ). Ovipositor sheath black, brownish at extreme apex.

Male. Similar to female in structure and colour pattern with slight differences.Flagellum without tyloids. First tergite, in dorsal view, almost 2.9 times as long as posteriorly broad. Distal part of metasoma not or weakly compressed laterally, more or less cylindrical. Face yellow, with one median (indistinct in one paratype) and a pair sublateral longitudinal stripes in upper half. Pale markings on the mesosoma are weaker than in female (possibly due to storage in alcohol). Otherwise similar to female.

REMARKS. Unlike L. cushmani sp.n. which is characterized by considerable sexual dimorphism, females and males of L. toluca sp.n. are very similar, with minor differences in structure and colouration.

ETYMOLOGY. The species is named after the type locality, volcan Toluca (noun).

DISTRIBUTION. Central Mexico (EMex).

BIOLOGY. The adult parasitoids were reared from cocoons of Neodiprion omosus Smith ( Fig. 3 ) whose larvae develop on Pinus patula Schiede and P. hartwegii Lindley ( Pinaceae ) ( Figs 1–2 ) in Central Mexico.

Figures

Figs 14–17. Lamachus toluca sp.n., female, holotype: 14 — body and wings, lateral view; 15 — antennae, lateral view; 16 — head and mesosoma, lateral view; 17 — head and mesoscutum, dorsal view. Рис. 14–17. Lamachus toluca sp.n., самка, голотип: 14 — тело и крыльЯ, сбоку; 15 — антенны, сбоку; 16 — голова и меЗосома, сбоку; 17 — голова и меЗоскутум, сверху.

Figs 18–19. Lamachus toluca sp.n., female, holotype: 18 — head, front view; 19 — propodeum and metasoma, lateral view. Рис. 18–19. Lamachus toluca sp.n., самка, голотип: 18 — голова, спереди; 19 — проподеум и метасома, сбоку.

Fig. 13. Lamachus cushmani sp.n., male, habitus, lateral view. Рис. 13. Lamachus cushmani sp.n., самец, габитус, сбоку.

Figs 1–5. Neodiprion omosus in nature: 1–2 — feeding larvae; 3 — cocoons; 4–5 — adult sawfly. Рис. 1–5. Neodiprion omosus в природе: 1–2 — питаюЩиесЯ личинки; 3 — коконы; 4–5 — вЗрослые пилильЩики.