Lymeon xalapensis Kasparyan, 2021

Kasparyan, D. R., 2021, Three new ichneumonid species of the genus Lymeon Förster, 1869 (Hymenoptera: Ichneumonidae: Cryptinae) from Mexico, Russian Entomological Journal 30 (1), pp. 84-92 : 88-90

Lymeon xalapensis Kasparyan , sp.n.

Figs 9–13 .

MATERIAL EXAMINED. Holotype: ♀, Mexico, Veracruz, Xalapa , USBI, Malaise Trap, January-February 2018 (M. López-Ortega) ( UNAM). Paratypes, 3 ♀, same locality and collector as holotype: 1 ♀ February 2017 ( UNAM), 1 ♀ January-February 2018 ( UNAM), 1 ♀ March 2018 ( ZIN)

COMPARISION. Lymeon xalapensis sp.n. is similar to L. scitula sp.n. as both have broad, low and obtuse apophyses on the propodeum, whitish and black colouration of head and mesosoma, and pale reddish brown metasoma and hind legs. Lymeon xalapensis can easily be distinguished from L. scitula in having speculum and mesosternum whitish ( Fig. 9 ), mesoscutum with a large oval white spot centrally ( Fig. 11 ), almost polished frons, granulate clypeus and black ventrally scape of antenna ( Fig. 10 ) (see also the key below, couplet 4).

Description. Female (holotype). Fore wing length 5.9 mm. Antenna with 24 flagellomeres; flagellomeres 1 and 2 almost subequal and combined about 1.65 times as long as maximum diameter of eye; flagellomeres 4–9 subcylindrical and weakly widened, 1.2 as wide as flagellomeres 1 and 2. Flagellomeres 10–23 are subcylindrical, about 1.5–1.7 times as long as wide; the apical one about 2.5 times as long as wide, 0.9 times as wide as previous ones. Face and clypeus mat, evenly finely granulate, the setae sparse and moderately long. Clypeus rather strongly convex in profile, with scarce punctures; its transverse ridge with the maximum height just below the middle, with some anteriorly directed strong setae; lower margin of clypeus sharp truncate, centrally slightly impressed and darkened ( Fig. 10 ). Frons shining, with very smoothened fine granulation, with thin median longitudinal groove, punctures fine and moderately sparse, setae moderately short; its lower half above antennal sockets with a pair of large and almost polished superficial concavities. The vertex and temples polished with fine sparse punctures. Head very strongly narrowed behind eyes (dorsal view). Temple broadened to mandibles, in profile their maximum length about 2 times more than its minimum length at level of dorsal 0.25 of eye. Occipital carina weakly sinuate before its connection with hypostomal carina; oral carina slightly higher than occipital carina and about 0.5 times as long as basal width of mandible. Malar space 0.75 times as long as basal width of mandible. Mandible rather narrow at apex, its upper tooth hardly longer than the lower tooth.

Epomia absent. Notauli deep and long. Mesoscutum mat, very finely granulose, covered with scarce moderately large punctures and scarce short setae. Prescutellar groove with about 8 short transverse rugae. Scutellum polished with scarce punctures. Mesopleuron shining, covering with scarce fine punctures, without rugosity, polished in upper half, and smooth with the traces of granulation in lower half. Speculum is large and polished. Mesosternum smooth with moderately large punctures with rather short setae. Metapleuron shining, finely and evenly granulate, without rugosity, and with scarce moderately large punctures with rather long setae; its upper division (just behind upper part of epimeron) almost smooth with rather short fine setae. Postscutellum in basal 0.7 with lateral carinae and with a pair of deep pits at base. Groove between propodeum and metanotum just behind postscutellum narrow and deep; its anterior slope without small tooth laterad of postscutellum at its hind edge. Propodeum with the basal transverse carina thin and complete; the apical transverse carina absent and represented by a pair of large obtuse apophyses ( Fig. 12 ); apophyses conical, low, 0.5 as high as their basal diameter; propodeum finely granulate with fine scabrosity, between apophyses and near hind margin with longitudinal rugosity.

Areolet small, about half as long as 2nd recurrent vein above the bulla. Nervulus shortly antefurcal; postnervulus intercepted at anterior 0.32 ( Fig. 9 ). Nervellus intercepted at posterior 0.36; brachiella present, reaching about 0.5 of distance to wing margin. Hind femur 5.0 times as long as wide. Proportions of length of hind tarsomeres 1–5: 7.7: 3.6: 2.2: 0.8: 1.8.

Metasomal segment 1 slender, 4 times as long as minimum width of petiole and 2 times as long as wide at posterior margin; first tergite evenly covered with dense granulation except for its extreme base and apex, dorsolateral and ventrolateral carinae absent. Tergite 2 at posterior margin 1.0 times as wide as long, and 2.5 times as wide as its width at anterior margin; its surface mat, very evenly and finely granulate with very scarce short setae; sculpture of following tergites rather similar to that of tergite 2 but finer and smoother on each subsequent tergite and becomes hardly discernible on tergites 6–8. Tip of dorsal valve of ovipositor behind the nodus rather slender, 1.4 times as long as segment 2 of hind tarsus and 3.6 times as long as height of ovipositor on nodus; apical 0.33 of upper valve beyond the nodus distinctly depressed ( Fig. 13 ). Ovipositor 1.25 times as long as hind tibia, ovipositor sheath 0.8 as long as tibia.

Antenna black with flagellomeres 4–9 entirely white. Head and mesosoma with yellowish white and black markings, metasoma pale reddish brown marked with whitish ( Figs 9, 12 ). Head whitish except for dark brown mandibular teeth, a small central and two lateral markings on the lower margin of clypeus ( Fig.10 ), and a narrow black median band going from gap between antennal sockets to occipital carina; occiput black except for postgenae. Mesosoma black with white pattern and small reddish markings on propodeum ( Figs 9, 11–12 ); propleuron white. Mesoscutum black with a white central oval large spot covering at least 0.5 of mesoscutum length; scutellum whitish dorsally with hind margin black ( Fig. 11 ). Mesopleuron and mesosternum yellowish white with front margin, ventral part of prepectus, wide band under subtegular ridge, short line from mesopleural pit to epimeron and lower half of epimeron black ( Fig. 9 ). Postscutellum white. Metapleuron whitish with sutures black. Propodeum black with two large white spots on apophyses, and with reddish gap between apophyses ( Fig. 12 ). Fore wing translucent, without infuscation. Fore and mid coxae completely white; their trochanters light brown, white anteriorly; their trochantelli light brownish. Fore and mid femora, tibiae and tarsi pale brownish, with fifth tarsomere brown. Hind legs light brownish red with a large dorso-posterior white spot on coxa; apex of basitarsus, fourth tarsomere except blackish apex, and tarsomere 2 and 3 entirely white; fifth tarsomere blackish. Metasomal tergites pale reddish brown with apical 0.15 of tergites 1 and 2 white; extreme hind edge of tergite 2 light reddish brown, hind corner of tergite 3 with white small marking; sternites pale yellowish brown, marked with dark brown at base of sternites 2 and 3.

Male. Unknown.

ETYMOLOGY. The species name refers to the type locality Xalapa.

Figures

Figs 9–13. Lymeon xalapensis sp.n., female:9 — habitus, lateral view; 10 — head, frontal view; 11 — head and anterior part of mesosoma, dorsal view; 12 — hind part of mesosoma, hind coxae and first tergite of metasoma, dorsal view; 13 — apex of ovipositor, lateral view. Scale bar in Fig. 9 — 2.0 mm. Рис. 9–13. Lymeon xalapensis sp.n., female: 9 — обЩий вид, сбоку; 10 — голова, спереди; 11— голова и переднЯЯ часть меЗосомы, сверху; 12 — ЗаднЯЯ часть меЗосомы, Задние таЗики и тергит 1 метасомы, сверху; 13 — вершина Яйцеклада, сбоку. МасштабнаЯ линейка к рис. 9 — 2.0 мм.