Chlamisus metasequoiae Gressitt & Kimoto, 1961

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.