Chlamisus castaneus ( Chen, 1940 )

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 : 30-33

Chlamisus castaneus ( Chen, 1940)

(Figs 9-1; 9-2; 9-3; 9-4)

Chen, 1940: 193, 201; (orig.: Chlamys castanea ; type locality: S. China, no precise locality; type deposited: IZ-CAS); Gressitt , 1946: 88 (as Chlamisus castaneus ); Gressitt & Kimoto , 1961: 177; Zhou, 1999: 323, 327; Medvedev, 2000: 174 ( Laos).

Material examined. CHINA: Fujian Province: 1♂, Chong’an, Mt. Wuyi [Wuyishan] Sanatorium , 175–300 m, 13. VII. 1960, coll. Fuji Pu ; 1♂, Chong’an, Cheng-guan , 240 m, 5. VI. 1960, coll. Puji Fu (IZ-CAS), (female specimen absent).

Measurements. BL = 2.7 mm, BW = 1.8 mm, HL = 0.9 mm, HW = 0.75 mm, PL = 1.4 mm, PW = 1.6 mm, EL = 1.9 mm, PYL = 0.7 mm, PYW = 0.8 mm, AL = 0.8 mm, AA = 125°.

Redescription. Body (Figs 9-1A; 9-2A) rather small, mostly glabrous. General color chestnut-orange to reddish brown; pronotum mostly orange, with three black spots transversely lining on top of disc, and tubercles yellow; scutellum black, slightly marked with yellow in the center; elytra orange, basal margin and elytra suture black, depressed area between tubercles and ridges also black; underside black, marked with orange on lateral sides and 5th abdominal segment; pygidium black, with raised area reddish brown.

Head (Figs 9-1D; 9-2E) mostly orange, a brownish black triangular spot along median line of vertex, brown on occiput, and areas around the antennal socket and bottom of clypeus; nearly round, slightly longer than broad, densely and shallow-roundly punctured. Labrum black, triangular, three times as broad as long. Eyes black.

Antennae (Figs 9- 1I; 9-2C) orange, last five segments slightly darker. Scape twice as long as broad, pedicel small and triangular, 3rd slender, 4th slightly dilated, 5th larger than 4th, 6–10th flat and broad, serrated, 11th with a small notch near apex.

Pronotum (Fig. 9-1F) finely and densely punctured, somehow reticulate, very sparse on lateral portions of disc; a low tubercle on the lateral portion; disc strongly raised with globular elevation which stronger posteriorly but rather flat in anterior portion, no distinguishable tubercles or ridges on anterior and median portion of pronotum, with a short transverse groove at posterior declivity. Scutellum (Fig. 9-1H) rectangular, produced anteriorly, posterior-lateral angles weakly and roundly extended. Prosternum (Figs 9-1E; 9-2B) goblet-shaped, lateral projections of prosternal process acute, apex rather obtuse.

Elytra (Fig. 9-2G) slightly rounded apically, lateral sides oblique; coarsely, densely and deeply punctured, puncture intervals raised; suture teeth small, absent at apex; basal margin from scutellum to near median ridge weakly rugose, humeri strongly rugose; longitudinal ridges rather sharp, tubercles distinct; sutural row weakly ridged, consisting of four tubercles, 1st very small and weak, 2nd small, 3rd merging with the 3rd tubercle of median row into a transverse tubercle, 4th small, next to suture, and a very small tubercle right below scutellum; median row consisting of four tubercles, longitudinal ridges throughout, 1st situated near basal margin, 2nd merging with the 2nd tubercle of humeral row into a transverse tubercle, 4th obsolete, 5th largest and cone-shape; humeral row consisting of three tubercle, 1st small, with two short ridges branching upwards and sideways, 3rd small; lateral row with two tubercles, 1st large and transverse, 2nd small; a small and sharp tubercle at posterior-lateral angle, and a large tubercle consisting of several small tubercles above it. Legs (Fig. 9-1J) mostly orange, a dark median stripe on hind femora, slightly darker on joints.

Abdomen (Fig. 9-1G) coarsely and densely covered with shallow round punctures; three tubercles near lateral margins of 1st abdominal segment; 5th segment with a broad and round fovea in the middle. Pygidium (Figs 9-1C; 9- 2F) broader than long, coarsely, sparsely and deeply punctured on depressed areas, finely and densely punctured on carinae; median longitudinal carina sharp and throughout, lateral carinae wide and punctured, rather straight, with a very narrow transverse carina connecting at one-fourth from base, interspaces of these carinae and the lateral portions moderately depressed.

Aedeagus (Figs 9-3; 9-4) with apex of median lobe as broad as middle, and rounded apically, slightly produced at top, with some yellow pubescence on each sides of the top, and densely punctured on the ventral side of distal part; median orifice with middle sclerite bending inwards very far above surface at one-tenth of median lobe, slightly acute at top, outline a little distance from outer margin; inner sac almost rectangular, bilobed both basally and distally; tegmen moderately sclerotized.

Distribution. China (Fujian); Laos.

Diagnosis. This species is similar to C. rufulus by its body coloration and shape, but the former is much paler with its body color and has also three transversely arranged dark spots on pronotum. Its pronotum is also much less ridged.