Stenoscelis aceri Konishi, 1962

Stenoscelis aceri Konishi, 1962 View in CoL

[Japanese common name: Itaya-kuchibuto-kikui-zômushi]

( Figs 23–24 View FIGURES 17–24 , 35–39 View FIGURES 35–39 , 73 View FIGURE 68–73 & 82 View FIGURE 78–83 )

Stenoscelis aceri Konishi, 1962: 14 View in CoL (type locality: “Maruyama, Sapporo, Hokkaido ”, Japan); Morimoto, 1983 (in key); Morimoto & Kojima, 2004 (cataloged); Hlaváč & Maughan, 2013 (cataloged); Alonso-Zarazaga et al., 2023 (cataloged).

Diagnosis. This species is very similar to S. longisetosus , but differs in the following character states: elytra longer (1.8–1.9 times as long as wide); apex of elytra separately produced in a small process at apex ( Fig. 82 View FIGURE 78–83 ), acutely angulated in lateral view ( Fig. 24 View FIGURES 17–24 ); aedeagal body 1.7 times as long as wide, 1.4 times as long as apodeme ( Figs 35–36 View FIGURES 35–39 ); spermatheca with collum and ramus developed ( Fig. 39 View FIGURES 35–39 ).

Redescription. Body length 2.3–2.7 mm; black, rather shiny; mouth parts, antennae, tarsi, and apical part of tibiae reddish brown; setae yellowish brown.

Rostrum 0.6 times as long as wide; dorsum convex; dorsal surface reticulate, rugosely punctate; punctures small, separated by interspace approximately 1–2 times as long as diameter; upper margin of scrobe directed to middle of eye; epistome with six long setae basally, with anterior margin obtusely projected at right side. Head with dorsal surface reticulate, smoothly punctate; punctures small, separated by interspace approximately 2–4 times as long as diameter; interocular area with a shallow fovea; eye round, hardly convex.

Antennae with club subcircular, slightly wider than long; funicle 7-segmented, slightly longer than club.

Prothorax 0.9–1.0 times as long as wide, widest before base, gradually narrowed anteriorly, weakly sinuate laterally; anterior margin weakly sinuate in middle or not; subapical constriction distinct on lateral side, obsolete on dorsal side; disc reticulate, rugosely punctate; punctures medium, separated by interspace almost as long as or narrower than diameter.

Elytra 1.8–1.9 times as long as wide, 1.1 times as wide as and 2.0–2.1 times as long as prothorax, subparallel, separately produced in a small process at apex; apex acutely angulated in lateral view; striae rather deep, with medium punctures separated by interspace approximately 1–2 times as long as diameter; apical part of striae moderated, not dilated or reticulate; second stria distinctly separated from base; intervals somewhat convex, with an irregular row of small puncture; base of second to third or fourth interval rugosely punctate-granulate; apical half of ninth interval and tenth interval carinate; granules of intervals arranged in a single row, indistinct basally, distinct and conical on declivity; setae on declivity arranged in a single row, each behind a granule, distinct and more than twice as long as granules.

Aedeagal body (figs 35–36) 1.7 times as long as wide, 1.4 times as long as apodeme, moderately arcuate laterally, gradually narrowed and weakly prolonged apically; apodeme attached sublaterally; endophallus with a pair of sclerite on subapical part; tegmen without dorsal part and paramere, with distinct manubrium; spiculum gastrale gradually curved to right side apically, not expanded apically; sternite VIII divided, with several long setae apically; without spinulate apical membranous area.

Spiculum ventral not bifurcate at base; spermatheca with cornu falciform; collum well developed; ramus well developed.

Biological note. The adult (Holotype) was collected from the dead stem of Acer pictum Thunb. in Maruyama , Hokkaido Pref.

Type material. Holotype ( Figs 23 & 24 View FIGURES 17–24 ): male ( SEHU), “ Maruyama / Hokkaido / 29.VII.1956 / M. Konishi ” (white card); “HOST / イタヤカエデ / のëƾ (stem)” (white card); “Holo-type / Stenoscelis / aceri / KONISHI” (red card); “HOLOTYPE / The label attached by / ÔHARA and HIRONAGA / 2006” (white card); “0000000256 / Sys. Ent / Hokkaido Univ. / Japan [SEHU]” (white card).

Non-type material. Japan: Honshu: [Aomori Pref.]: 1 unsexed, Hironishi-rindô, Ajigasawa-machi , 12.VII.1997, T. Ozaki leg. ( KUM); 2 male, 2 female, ditto, 21.VII.1997, T. Ozaki leg. ( KUM); 1 unsexed, ditto, 30.VII.1995, T. Ozaki leg. ( KUM) .

Distribution. Japan: Hokkaido and Honshu.