Cryptopleurum sulcatum Motschulsky, 1863

Cryptopleurum sulcatum Motschulsky, 1863 View in CoL

( Figs 24‒31 View Figs 24–31 )

Cryptopleurum sulcatum Motschulsky, 1863: 448 View in CoL . Cryptopleurum sulcatum: HANSEN (1999: 310) View in CoL : catalogue.

Type locality. Ceylan [= Sri Lanka].

Material examined. CHINA: HAINAN: 1 male ( SYSU): Hainan Prov. Ledong, Jiaxi Nature Reserve , 18.83ºN 109.18ºE ， 10‒11.ix.2013, Coll. Weicai Xie lgt. (transcribed from Chinese) GoogleMaps . YUNNAN: 1 male ( SYSU): Yingjiang County, Nabang , 24.75ºN 97.56ºE, 239 m, 27.v.2016, Yudan Tang & Ruijuan Zhang lgt GoogleMaps .; 1 spec. ( NMPC): Tongbiguan vill., at light, 1340 m, 24.60ºN 97.65ºE, 24‒26.vi.2016. Hájek & Růžička lgt GoogleMaps .

Redescription. Length 1.8 mm. Dark yellow brown with apical portion of elytra pale; ventral side black with reddish-brown legs. Head and pronotum strongly shagreened between punctures ( Fig. 31 View Figs 24–31 ); a few smaller punctures mixed among coarse punctures on pronotum ( Fig. 31 View Figs 24–31 ). Elytra with intervals strongly elevated and gradually narrowed from base to apex ( Figs 24, 26, 29 View Figs 24–31 ) (stronger and narrower than those of C. coomani ), striae much deeper than other known species from the Oriental and Palaearctic Regions, each interval with a regular row of small punctures ( Fig. 29 View Figs 24–31 ); seventh and eighth striae very close, both situated in the same groove ( Fig. 29 View Figs 24–31 ), interval eight only slightly elevated as a threadlet, punctured striae wider than intervals in posterior quarter. Elevation of metaventrite distinctly shagreened between coarse punctures. Aedeagus ( Figs 27, 28 View Figs 24–31 ): stout, length of parameres and phallobase combined ca. 4× as long as basal width of both parameres. Paramere ca. 2.3× as long as phallobase, ca. 8× as long as wide medially, apex narrowly rounded and curved inwards subapically, with membrane projecting inwards subapically. Median lobe ca. 5.3× as long as width at midlength, distinctly narrowed about apical eighth, apex ca. as wide as paramere at level of paramere.

Differential diagnosis. This species is similar to C. coomani , but can be distinguished from the latter by each elytral interval only having a row of fine setiferous punctures, the punctural striae being distinctly wider than the intervals on the basal half ( Fig. 29 View Figs 24–31 ) and being as wide as or slightly wider than the interval on in the posterior fourth ( Fig. 26 View Figs 24–31 ). The elytral intervals are sharply costate.

Biology. Unknown.

Distribution. The Oriental species known from India, Sri Lanka, Vietnam, peninsular Malaysia and Singapore. First record for China ( Yunnan, Hainan).