Misetus strumiai Di Giovanni, Scaramozzino & Diller, 2018

Giovanni, Filippo Di, Scaramozzino, Pier Luigi & Diller, Erich, 2020, Description of the male of Misetus strumiai Di Giovanni, Scaramozzino & Diller 2018 (Hymenoptera, Ichneumonidae, Ichneumoninae, Phaeogenini) from Italy, Zootaxa 4810 (1), pp. 198-200 : 198-200

Misetus strumiai Di Giovanni, Scaramozzino & Diller, 2018 ( Fig. 1 a–e)

Material examined. ITALY: 3♂♂, Toscana, Livorno, Isola di Montecristo , 06.vi–26.vi.2012, Malaise trap, F. Strumia leg; same data : 1♂, 15.vi–07.vii.2011. Specimens are deposited in the entomological collection of the Zoologische Sta- atssammlung Museum ( ZSM) in Munich (Germany) and in the personal collections of FDG and PLS (Pisa University, Italy) .

Description. Male. Body length about 5.6 mm. Fore wing length 4 mm. Body covered with fine, short and silky pubescence.

Head. Face about 0.5–0.6 × as high as wide (width between compound eyes at the level of clypeal suture; height from antennal sockets to clypeal suture), smooth and shining with well defined and dense punctuation; clypeus smooth and shining, with scattered punctures, its apical margin slightly convex and with a small developed medial tooth; mandible about 2.5 × as long as basally wide, teeth unequal, upper tooth clearly longer the lower one; malar space about 0.7 × as long as mandible width; malar sulcus coriaceous; frons and vertex smooth with sparce and shallow punctures; gena smooth and shining with few inconspicuous punctures; gena roundly narrowed behind eye in dorsal view; distance between lateral ocellus and eye about 0.8–0.9 × as long as interocellar distance; occipital carina complete, dorsally pointed, joining hypostomal carina at base of mandible; antenna with 24–25 flagellomeres, first flagellomere about 2.2–2.3 × as long as apically wide; tyloids present, evident on 9th–12th flagellomeres.

Mesosoma . Pronotum smooth and shining, with just few undefined punctures on dorsal part and small fine wrinkles on anterior and posterior margins; epomia absent; mesoscutum with dense punctures, notaulus deeply impressed in the anterior half; scutellum with dense punctures, with a hint of lateral carinae only at level of scuto-scutellar groove; mesopleuron, except for smooth speculum, covered with fine longitudinal striae, with inconspicuous punctures between striae; sternaulus impressed in the anterior half of mesopleuron; epicnemial carina present and reaching anterior margin of mesopleuron; epicnemium and mesosternum coriaceous-punctate; posterior transverse carina of mesosternum complete but weak at level of middle coxa; metapleuron smooth and shining in anterior half, coriaceous and with irregular wrinkles on posterior half, pleural carina complete; propodeum irregularly wrinkled, with carinae difficult to discern on wrinkled background, with the exception of posterior transverse carina complete; area superomedia irregular, subsquared, costula originating from base of the area superomedia, distinct only at its base; area basalis not defined; area petiolaris concave and transversally striate. Fore wing areolet regularly pentagonal; cu-a opposite Rs&M; length of Cu1 between 1m-cu and Cu1a about 1.7–1.8 × as long as Cu1b. Hind wing with distal abscissa of Cu1 present; length of Cu1 between cu-a and M about 2.1–2.5 × as long as cu-a. Hind coxa subpolished, punctate; hind femur about 3.3 × as long as maximum width.

Metasoma. Metasoma not laterally compressed. Metasomal tergite I with dorsal longitudinal carinae weak, median and lateral parts of postpetiole not differentiated; postpetiole irregularly punctate on median part, strigose on lateral parts; Metasomal tergite II about 1.8 × as long as apically wide, coriaceous in the middle, slightly strigose laterally, then on apical 2/3 smooth and shining and with dense punctures; thyridium on tergite II strong and separated from the base by a distance longer than its width; metasomal tergite III smooth and shining with dense punctures; remaining metasomal tergites smooth and with dense but shallow punctures, less evident on last tergites.

Color. Head black, margin of clypeus, small spots on inner orbits (sometimes absent) and scape ventrally reddishbrown, mandible (except teeth reddish), maxillary and labial palps yellow; flagellum dark brown dorsally, reddish-brown ventrally. Mesosoma black, scutellum apically and postscutellum reddish-brown, ventral hind corner of propleuron, ventral margin and dorsal hind corner of pronotum, subalar prominence, tegula yellow. Fore and mid coxae, trochanters and trochantelli yellowish-white; fore and mid legs reddish, tarsi reddish-brown; hind leg and coxa dark brown, apical part of coxa, base of femur, insertion of tibia and of all tarsomeres reddish-brown, hind trochanter, trochantellus and hind tibial spurs yellow. Metasoma with tergite I black with apical spot yellowish-red, following tergites dark brown with apical margin yellowish-red, thyridia on tergite II, tergite VII and parameres yellowish-red. Wings hyaline, veins and pterostigma yellowish-brown.

Diagnosis. The male of M. strumiai differs from the female (see Fig. 5–8 in Di Giovanni et al. 2018) in having metasoma not laterally compressed, postpetiole with few rugulose punctures and tergite II slightly longer than in female, slightly coriaceous at the base then polished with dense punctures, with thyridia strong; in the color pattern, it differs in having flagellum dark brown dorsally and reddish-brown ventrally, mesosoma mostly black, with scutellum apically and postscutellum reddish-brown and subalar prominence, ventral margin and dorsal hind corner of pronotum yellow, metasoma with abdominal tergites dark brown with apical margin yellowish-red, hind femur and tibia dark brown.

According to the key to the European males of Misetus by Selfa & Diller (1995: 801), the male of M. strumiai can be keyed out with M. tyloidalis Kolarov, 1985 , as it has hind femur dark brown and propodeum with area superomedia not defined, but it can be distinguished from the latter by its smaller size, antenna with 24–25 flagellomeres and tyloidae starting from 8 th flagellomere, temple shorter than eye width, mesopleuron covered with fine longitudinal striae, and metasomal tergite II basally slightly coriaceous-strigose. From M. nigritulus Kolarov, 1985 it differs by its smaller size and in having propodeum with costulae distinct only at the base, dorsolateral carina of postpetiolus weakly distinct, metasomal tergite II longer than apically wide, with thyridia separated from the base of the tergite to a distance longer than its width, and tegula yellow. From males of M. oculatus Wesmael, 1845 , it can be separated by smaller size, antenna with only 24– 25 flagellomeres, propodeum with area superomedia irregularly shaped, metasomal tergite II basally slightly coriaceousstrigose, scutellum apically and postscutellum reddish-brown, hind coxa and femur dark brown. Males of M. strumiai resemble in size, irregular shape of area superomedia and color pattern small specimens M. hispanator Selfa, 1995 , but can be distinguished from this species by tegulae yellow, scutellum apically and postscutellum reddish-brown, hind femur and tibia entirely dark brown, metasomal tergite II basally comparatively less strigose, coriaceous in the middle.

Errata. In Di Giovanni et al. (2018), A new species of Misetus Wesmael, 1845 ( Hymenoptera , Ichneumonidae , Ichneumoninae , Phaeogenini ) from Italy, with updated key to the females of Palaearctic species, published in Zootaxa 4374 (4), 594–600, in the description of the female of M. strumiai is erroneously reported “teeth unequal, lower tooth clearly longer the upper one” (pp. 596), while it is the upper tooth that is clearly longer than the lower one.

Figures

FIGURE 1. Misetus strumiai Di Giovanni, Scaramozzino & Diller, 2018, male; a: habitus, lateral view; b: face, frontal view; c: head and mesoscutum, dorsal view; d: scutellum and propodeum, dorsal view; e: metasomal tergites I–III, dorsal view.