Chlamisus palliditarsis ( 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 : 59-63

Chlamisus palliditarsis ( Chen, 1940)

(Figs 15-1; 15-2; 15-3; 15-4)

Chen, 1940: 196 (orig.: Chlamys palliditarsis ; type locality: Kwangsi: Yangso; type deposited: IZ-CAS); Gressitt, 1946: 93 (as Chlamisus palliditarsis ); Gressitt & Kimoto, 1961: 183; Medvedev, 1968: 564 (as Chlamysus palliditarsis ; Vietnam); Kimoto & Gressitt, 1981: 360; Tan et al., 1985: 147; Zhou, 1999: 323, 327.

Material examined: CHINA: Guangxi Province: 1♀, Yangshuo, 20. X. 1938 ; Yunnan Province: 1♀, Xishuangbanna , Da-meng-long, 50 m, 9. IV. 1958, coll. Fuji Pu ; 1♀, Xishuangbanna , Da-meng-long, 50 m, 8. IV. 1958, coll. Fuji Pu ; Fujian Province: 1♂, Jianyang, Huang-keng , 300– 200 m, 20. VIII. 1960, coll. Shengqiao Jiang ; 1♂, Fuzhou, Xi-hu , 9. II. 1960, coll. Shengqiao Jiang ; 1♀, Dehua, Cheng-guan, 510–550 m, coll. Fuji Pu; 1♂, Chong’an, Cheng-guan , 240 m, 15. VII. 1960, coll. Shengqiao Jiang ; Guangxi Province: 1♂, Yangshuo. 20. X. 1938, collector unknown (IZ-CAS).

Measurements. BL = 2.9 mm, BW = 1.7 mm, HL = 0.75 mm, HW = 0.75 mm, PL = 1.2 mm, PW = 1.6 mm, EL = 2 mm, PYL = 0.8 mm, PYW = 0.8 mm, AL = 0.7 mm, AA =115°, SL = 0.25 mm.

Description. Body (Figs 15-1A, 15-3A) small, truncate apically. General color black and opaque, with slight piceous and cupreous on pronotum and elytra. Body strongly tubercled and/or ridged, strongly covered with very deep golden-haired punctures, puncture intervals strongly raised except for disc of pronotum and depressed area of pygidium.

Head (Figs 15-1D; 15-2E) nearly round, densely and shallowly punctured, with several irregular depressions on vertex, the depressions smooth but minutely scaled; labrum yellow, triangular, rounded apically, three times as broad as long; eyes black with slightly golden.

Antennae (Figs 15-1I; 15-2C) yellow, darker at apex; Scape three times as long as broad, pedicel small and triangular, 3rd and 4th short and slender, 5th also short, but slightly broader than 4th, 6th slightly dilated, 7–10th flat and very broad, serrated, 11th triangular.

Pronotum (Fig. 15-1F) deeply and densely punctured, reticulate on ridges; disc strongly elevated in globular form, with very distinct borders and very steep declivity at posterior part; two small tubercles at middle of anterior margin and a deep transverse groove behind them; a pair of high and short ridges thereafter, located at sides of longitudinal groove, a pair of longer longitudinal ridges even behind and a pair of oblique ridges branching from its one third, which reaching to anterior margin; also a pair of short transverse ridges branching from the end of longitudinal ridges and finally a pair of transvers ridges at top of posterior declivity, with a tubercle ending at side of disc; two tubercles on lateral portion, basal one large. Scutellum (Fig. 15-1H) moderately produced anteriorly, posterior-lateral angles strongly extended, and very obtuse. Prosternum (Figs 15-1E; 15-2B) goblet-shaped, prosternal process extended and sharp, its lateral projections subacute.

Elytra (Fig. 15-2G) truncate apically, lateral sides subparallel; coarsely and sparsely punctured; densely and finely rugose on humeri; suture teeth very sharp, absent at apex; basal margin from scutellum to near median row strongly rugose; longitudinal ridges and tubercles very sharp; sutural row consisting of four tubercles, 1st very weak, 2nd transverse, 3rd merging with 3rd tubercle of median row into a large transverse tubercle, weakly ridged between 3rd and 4th, 4th merging with 4th of median row; median row consisting of five tubercles, 1st situated near basal margin, 2nd merging with 2nd tubercle of humeral row into a transverse tubercle, 5th largest and oblong; humeral row consisting of three tubercle, 1st and 3rd small; lateral row with two tubercles, 1st transverse, 2nd small; a big sharp tubercle at the posterior-lateral angle, and a large tubercle consisting of several small tubercles above it. Legs (Fig. 15-1J) completely black, tarsi yellow.

Abdomen (Fig. 15-1G) shallowly and densely punctured; 1st visible abdominal segment with three small tubercles near lateral sides, last visible segment with a large and shallow round fovea in the middle. Pygidium (Figs 15-1C; 15-2F) as long as broad, deeply and sparsely punctured on depressed areas, very densely punctured on carinae and outer margins, median longitudinal carina and lateral carinae sharp, lateral carinae sinuate, curving inwards at one third from base, which connected by a transverse carina, and also curved inwards at apex, deeply depressed by its side; basal margin weakly raised.

Aedeagus (Figs 15-3C, 15-3D, 15-3E; 15-4C; 15-4D; 15-4E) slightly narrowed on apex, truncate at top, with several pubescence on top of each side, coarsely and densely punctured on the ventral side of distal part; median orifice with middle sclerite bending inwards at surface at one-third of median lobe, outline close to outer margin, bending inwards at one-fifth from apex, forming an arch on each side, middle sclerite truncate, with a small projection in the enter, lower part of outline produced and turning towards center; inner sac with apical part in a shape similar to a butterfly, with a pair of thin sclerite attached at base; tegmen rather strongly sclerotized.

Spermatheca (Figs 15-3B; 15-4B) acutely bending from two-fifth, acute on the apex, then gradually dilated, even to almost one third from base, then narrowed, duct moderately sclerotized, with dozens of coiling forming a ball-like structure. Rectal sclerites (Figs 15-3A; 15-4A) moderately sclerotized, rather strongly connected in the middle on ventral side, inner angle somewhat acute, strongly dilated at outer one-third, outer angle acute and pointing upwards.

Distribution. China (Fujian, Guangdong, Guangxi, Hainan, Sichuan, Guizhou, Yunnan); Vietnam.

Diagnosis. This species can be distinguished from most Chlamisus species by the distinct arrangement of tubercles and ridges on its pronotum and by the black color of its tibiae, femora and head; its tarsi are yellow. And there are some irregular and smooth depressions on vertex.