Zeugophora chujoi Ohno, 1961

[Japanese name: Kurohoshi-momobuto-hamushi]

(Figs 30 A–C; 31–34)

Zeugophora chujoi Ohno, 1961: 36 [type locality: Japan, Fukushima Pref. Kawairi, Mt. Iide]; Hasegawa & Kino, 1997: 11 [Host plant record]; Takizawa, 2006: 2 [listed]; Rodríguez-Mirón, 2018: 292 [listed].

Zeugophora (Pedrillia) chujoi: Kimoto, 1964: 110 [Japan: Honshu]; Silfverberg, 2010: 334 [listed].

Zeugophora (Zeugophora) chujoi: Kimoto &Takizawa, 1994: 98, 266 [Japan: Hokkaido, Honshu].

Description. Measurement. Body length: PEL, male, 2.80–3.30 mm, female, 2.73–3.44 mm. Width: EW, male, 1.37–1.64 mm, female, 1.46–1.75 mm. Biometric data are given in Table 7.

Coloration. This species’ coloration is much lighter in living individuals than in dried specimens. The following description is for preserved specimens.

Head yellowish brown; blackened posterior to eyes. Apex of mandible black. Antenna black except basal fourth of segments light orange. Pronotum light yellowish brown, lateroventral side black, lateral side sometimes black; central portion furnished with one or two blackened spots. Scutellum blackened cream yellow. Elytra light yellowish brown, lateral edge and epipleuron black, represented by two black spots posteriorly. Thorax of ventral surface black except anterior margin and apex of mesosternal prosses. Sternites testaceous. Legs yellowish brown except third segment of tarsi and claw darkened, and hind coxae black; crenulate carina of mid and hind tibiae testaceous.

Habitus. Body ovate.

Head (Fig. 32A) with reticulate coriaceous microsculpture, covered with sparse setiferous punctures; setae produced from inside punctures (Fig. 32A); frontoclypeal suture shallow and bisinuate, middle portion narrow, about one third width of clypeus; labrum and clypeus convex and furnished with setae; length of clypeus longer than that of labrum. Canthus small, obtusely triangular with apex rounded, furnished with a few setiferous punctures.Apex of mandible bifurcate and furnished with three teeth apically on inner margin; lateral angles furnished with setae (Fig. 31D). Antenna long; segments short, except for first, third and fourth which are long and slender, eleventh segment pointed; all segments setous, fifth through eleventh with shorter, denser setae (Fig. 31C).

Pronotum (Fig. 31A, 32B) with blunt lateral tubercles, tapered towards base; anterior margin grooved; posterior marginal groove undulate and complete; lateral basal angles weakly swollen and with two to five long setae near base; surface regularly convex, with reticulate coriaceous microsculpture, densely covered with coarse setiferous punctures (Fig. 33B); distance between punctures in central portion 0.5–3.0 times their own diameter, denser later- ally. Setae produced from anterior inner margin of punctures (Fig. 33B).

Elytra short, leaving apex of pygidium exposed, moderately vaulted in lateral view; lateral sides ovate, widen- ing approaching posterior margin; dorsal surface with reticulate coriaceous microsculpture (Fig. 33D), irregularly covered in dense setiferous punctures, punctures as coarse as on pronotum and separated by 2–4 times their diam- eter; setae produced anterior to puncture (Fig. 33D); lateral grooves complete from elytral base to apex; sutural grooves ambiguous on elytral base; basal areas of elytra weakly convex on either side of suture; humerus protruding anteriorly; epipleuron narrow. Scutellum trapezoidal, with setae.

Disc of mesoventrite sparsely furnished with setiferous punctures; mesosternal process narrow; process furnished with setiferous punctures (Fig. 31B, 32C). Mesepisternum sparsely furnished with setiferous punctures (Fig. 31B, 32C). Surface of metaventrite with reticulate coriaceous microsculpture, (Fig. 33C), central area covered with setiferous punctures, lateral area more densely covered with setiferous punctures, setae produced anterior to puncture (Fig. 33C). Surface of sternites with reticulate coriaceous microsculpture, sparsely covered with setiferous punctures. In male, posterior margin of 7th sternite evenly curved (Fig. 32D). In female, posterior margin of 7th sternite straight, but bisinuate on central portion (Fig. 32E).

Legs furnished with setae; tibial setae becoming longer and denser apically. Hind femora thickened. Tibiae straight; mid and hind tibiae with sharply defined and finely crenulate carina along external face. Apex of tibia with two spurs. Tarsi distinctly shorter than tibiae, basal three segments gradually widened apically.

Male genitalia as shown in Fig. 34 A–F: 8th sternite furnished with setae, short, oblique anteriorly, membrane and sclerotized portion narrow ventrally, allowing for downward extension (Fig. 34E, F); spiculum fan-shaped (Fig. 34D); median struts of median lobe approximately 2.2 times as long as median lobe (Fig. 34A); apex of median lobe pointed (Fig. 34B); paramere not developed (Fig. 34C).

Spermatheca as shown in Fig. 34G.

Host plant. Euonymus alatus (Thunb.) Siebold var. alatus f. striatus (Thunb.) Makino [Japanese name: Komayumi] (Y. Hasegawa & N. Kino, 1997; Takizawa, 2006); Euonymus japonicus Thunb [Japanese name: Masaki] (Y. Hasegawa & N. Kino, 1997; Takizawa, 2006); Euonymus fortunei (Turcz.) Hand. -Mazz. [Japanese name: Tsurumasaki].

Remarks. This species was previously recorded from Hokkaido by Kimoto 1986b, but was misidentified and is in fact Zeugophora cupka sp. nov. It has so far only been recorded from Honshu, Japan.

Types. Not studied.

Specimens examined. Japan. [Honshu] Tochigi Pref.: 3 exs., Yunishigawa, Kuriyama, 20.VII.2004, S. Maehara leg. (HSPC). Yamanashi Pref.: 2 exs., Minami-Tsuru, Oshino, 19.VII.2018, T. Takemoto leg. (TTPC). Kanagawa Pref.: 2 exs., Isehara, Mt. Sagami-Ôyama, 4.V.1987, N. Ueno leg. (MMPC), 1 ex., same data but different collector, A. Izumi leg. ; 3 exs., Hakone, Ôwakidani, 23.VIII.1999, M. Horikawa leg. (TTPC) ; 4 exs., Hakone, Sengokuhara, 16.IV.2018, F. Satô leg. (TTPC), 7 exs., same data but different date and collector, 16.VII.2018, T. Takemoto leg. (TTPC) .

Distribution. Japan: Honshu.