Cylindroeme yunnanensis Lin & Li 2022, sp. nov.

Cylindroeme yunnanensis sp. nov. 云fflåfihk牛

Figures 1–7 & 11–12

Type specimens examined. Holotype: male (Fig. 1), China, Yunnan, Kunming (Ễfi), 1984.V.16, Da-Rong Yang leg. (KIZ). Paratypes: 1 female (Fig. 2), the same as holotype data; 13 males and 10 females, China, Yunnan, Kunming (Ễfi), 1984.V.16, Da-Rong Yang leg. (KIZ); 1 male and 1 female, China, Yunnan, Kunming, alt. 2200m, host: Pyrus pashia Buch. - Ham. ex D.Don, 1984.V.16, Da-Rong Yang leg. (KIZ); 7 males and 8 females, China, Yunnan, Kunming (Ễfi), Huahongdong (ĖË洞), alt. 2200m, host: Pyrus pashia Buch. - Ham. ex D.Don, 1984. V.16, Da-Rong Yang leg. (KIZ); 1 male, China, Yunnan, Kunming (Ễfi), Huahongdong (ĖË洞), alt. 2200m, host: Cupressus funebris Endl., 1984.VIII.8, Da-Rong Yang leg. (KIZ).

Description. Male. Body length 7.7–13.8 mm, humeral width 1.3–2.0 mm. Body mostly yellowish-brown, with brown setae and golden pubescence. Head dark brown; mandible black apically; frons brown (Fig. 1e). Antennae fringed with sparse brown setae on inner sides of basal six antennomeres, covered with shorter silvery golden pubescence on external sides (Fig. 1b). Pronotum covered with silvery golden pubescence, forming some markings due to the different direction of the pubescence (Fig. 1d). Elytra with sparse golden brown setae..

Head slightly narrower than pronotum (Figs. 1d, 11); frons short, subrectangular, with a longitudinal median sulcus (Fig. 1e); eye large, upper eye lobes very close to each other (Figs. 1d, 1e), with lower eye lobes narrower towards middle (Fig. 1e). Antennae slightly longer than body, surpassing elytral apices by two antennomeres, antennomere III slightly shorter than antennomere IV, antennomere V the longest, antennomeres V–XI gradually decreasing in length. Pronotum much longer than broad, ratio of length to width ca. 1.5; discal middle region forming a marking by the special directions of pubescence, with a curved ridge surrounding the middle region (Figs. 1d, 11), which appearing a “u” shaped median notch near the pronotal apical margin. Scutellum ligulate. Elytra subparallel-sided, length about 4 to 5 times as long as humeral width; humeri rounded, slightly protruding forward; apices rounded; disc finely punctate, with a seta from each puncture. Prosternum covered with grayish pubescence except apical area (Figs. 1c, 12). Mesoventrite transverse. Metaventrite longer than wide, with a longitudinal median indentation at posterior half. Pro- and mesoventral processes very short (Fig. 12). Abdomen cylindrical, distinctly narrower than thorax, first ventrite longer than others (Fig. 1c). Legs short, femora strongly widened except basal stalk, laterally flattened; hind femora exceeding second ventrite; metatarsomere I nearly twice as long as two next combined, claws divaricate.

Male terminalia (Figs. 3–7). Tegmen (Fig. 6) about 1.1 mm in length, strongly curved near middle and apical half in lateral view (Fig. 6b); lateral lobes strongly reduced, only visible as a wide and shallow groove at apical part of tegmen (Figs. 6a, 6c). Median lobe with median struts slightly curved (Fig. 4a), much longer than tegmen; median struts about 3/5 of whole length of median lobe (Figs. 7a, 7b); ventral plate pointed at apex (Fig. 7a); median foramen elongate; internal sac with two sclerites at base (Figs. 4c, 7a, 7c) and a long apical region with many tiny sclerites (Fig. 5). Tergite VIII (Fig. 3c) trapezoidal, truncate on apex with rounded angles, slightly protruding, provided with semi-long setae along sides. Sternite VIII (Fig. 3a) well developed, with two protruding apical lobes like ears of cat at sides, with slightly shorter setae (compared with setae on tergite VIII).

Female. Body length 8.3–12.7 mm, humeral width 1.3–2.0 mm. Similar to male, but antennae shorter than body (Fig. 2b); pronotum nearly as long as broad, with discal ridges less complete and less obvious than in the male (Fig. 2d); elytra about 4.5 times as long as humeral width.

Remarks. This new species is most similar to the type species, C. vietnamica, but it can be separated by elytron without a longitudinal basal ridge (Figs. 1a, 1d, 2a vs. 8a, 8d); male with median notch at apex of pronotum less remarkable, and farther from pronotal apical margin, ridge on pronotum more distinct and complete (Figs. 1d, 11 vs. 8d, 10); female scutellum slender (Fig. 2d). It can easily be distinguished from C. shii by the upper eye lobes closer to each other, almost connected (Figs. 1d, 2d, 11).

Comparing the male genitalia with C. vietnamica, the new species has sternite VIII less protruding angles at sides (Fig. 3c vs. Fig. 13c), tegmen with lateral lobes even shorter (Fig. 6 vs. Fig. 16), apex of ventral plate of median lobe sharper (Fig. 7 vs. Fig. 17), the ratio of medion struts / median lobe lower (ca. 3/5 vs. ca. 3/4).

Etymology. The new species is named after the type locality, Yunnan Province, China.

Distribution. China (Yunnan).