Chlamisus metasequoiae Gressitt & Kimoto, 1961

Su, Liang & Zhou, Hong-Zhang, 2017, Taxonomy of the genus Chlamisus Rafinesque (Coleoptera: Chrysomelidae) from China with description of three new species, Zootaxa 4233 (1), pp. 1-138 : 50-53

Chlamisus metasequoiae Gressitt & Kimoto, 1961

(Figs 13-1; 13-2; 13-3; 13-4)

Gressitt & Kimoto, 1961: 182 (type locality: Sui-sa-pa, Lichuan Distr., 1000 m, near Hupeh-Szechuan border; type deposited: CAS).

Distribution. China (Hubei).

Material examined. CHINA: Yunnan Province: 1♂, Meng-hai , 1250 m, 21. II. 1981, coll. Fuji Pu (IZ-CAS). Measurements. BL = 2.5 mm, BW = 1.75 mm, HL = 0.75 mm, HW = 0.7 mm, PL = 1.2 mm, PW = 1.65 mm, EL = 1.9 mm, PYL = 0.85 mm, PYW = 1 mm, AL = 1 mm, AA = 115°.

Redescription. Body (Figs 13-1A, 13-2A) rather small, opaque. Labrum and tarsi with yellowish hairs, other parts of body glabrous. General color blackish bronze, scattered with piceous, metallic-purple, metallic-blue and dark reddish brown; depressed areas of pronotum dark, somehow red anteriorly, elytra piceous near sutural, basal and lateral margins; head and underside mostly bronze.

Head (Figs 13-1D; 13-2E) round, densely covered with shallow round punctures, a small and deep fovea in the center of vertex; labrum rectangular, twice as broad as long; eyes black.

Antennae (Figs 13-1I; 13-2C) yellowish brown, darker basally and apically; Scape twice as long as broad, pedicel subtriangular, 3rd and 4th segment very short and slender, same length, 5th–11th flat, short and broad, serrated.

Pronotum (Fig. 13-1F) densely and deeply punctured; several irregular small tubercles on the lateral portion, disc strongly elevated, with four curved ridges forming a cross-shaped and depressed interspace at top; the anterior two curving forwards, with a pair of short transverse ridges near anterior margin; the posterior two curving backwards, forming two rings; a pair of oblique ridges posteriorly, joining at top of posterior-declivity, also another pair on the sides of disc. Scutellum (Fig. 13-1H) very wide, posterior-lateral angles moderately produced, obtuse. Prosternum (Figs 13-1E; 13-2B) goblet-shaped, lateral projections of prosternal process obtuse, with apex bluntly pointed.

Elytra (Fig. 13-2G) truncate apically, lateral sides of elytra oblique; finely, deeply and sparsely punctured; suture teeth small, weak basally; densely rugose near basal margin from scutellum to median row, humeri strongly rugose; longitudinal ridges and tubercles sharp; sutural row consisting of four tubercles,1st and 2nd small, 3rd merging the 3rd tubercle of median row into a transverse tubercle, a short ridge branching towards suture between 2nd and 3rd, 4th merging with the 4th tubercle of median row; median row consisting of five tubercles, 1st situated near basal margin, 2nd merging with the 2nd tubercle of humeral row into a transverse tubercle, 5th large; humeral row consisting of three tubercles, 1st small, with a short ridge branching towards apex of elytra, 3rd also small; lateral row consisting of two tubercles, 1st transverse, 2nd small; one big and sharp cone-shape tubercle at the posteriorlateral angle, also a large tubercle consisting of several minute tubercles above it. Legs (Fig. 13-1J) bronzy outwards, black inwards.

Abdomen (Fig. 13-1G) densely and shallow-roundly punctured, 1st visible abdominal segment with 3 small tubercles near lateral margins, 5th segment with a broad and shallow fovea in the middle, depressed in the center, with a pair of velvety brown spots basally. Pygidium (Figs 13-1C; 13-2F) slightly broader than long, deeply and densely punctured, puncture intervals raised on carinae; median longitudinal carina absent basally, only present at apical one-third, lateral carinae complete, bending inwards, without transverse carina; interspaces of these carinae shallow, and the lateral portions deeply depressed.

Aedeagus (Figs 13-3; 13-4) with apex of median lobe restricted from apical one-fourth, rounded apically, with several pubescence on top of each side, and densely punctured on the ventral side of distal part; median orifice with middle sclerite bending inwards from surface at one-third of median lobe, outline close to outer margin, with a pair of narrow sclerites extending from inside; inner sac broad basally, narrowed and bilobed apically; tegmen thin and weakly sclerotized.

Distribution. China (Hubei, Yunnan).

Diagnosis. This species is similar to C. setosus in general shape, but the former has metallic shining throughout and the ridges on its pronotum disc form a cross-shaped depression; its pronotum does not have obvious hairs and the carinae on pygidium is also different.