Sticholotis dilatata Wang & Ren

Xingmin Wang, Hermes E. Escalona, Shunxiang Ren & Chen Xiaosheng, 2017, Taxonomic review of the ladybird genus Sticholotis from China (Coleoptera: Coccinellidae), Zootaxa 4326 (1), pp. 1-72 : 22

Sticholotis dilatata Wang & Ren sp. nov.

( Figures 50–52 , 183–186 , 298 )

Diagnosis. This species is similar to S. cinctipennis in general appearance, but can be distinguished from latter by yellowish brown pronotum, very wide lateral elytral margin and elytra with a row of large punctures around the central black spot ( Fig. 50 ). In S. cinctipennis , pronotum is dark brown, lateral elytral margin moderately large and elytra have 2–3 rows of large punctures extending from base to apex ( Fig. 53 ). The male genitalia of S. dilatata are very distinctive because of parameres which are distinctly dilated, lamellae-shaped in apical 1/3 length ( Figs 185– 186 ).

Description. TL: 2.34 mm, TW: 2.14 mm, TH: 1.35 mm, TL/TW: 1.09; PL/PW: 0.40; EL/EW: 0.86; HW/TW: 0.37; PW/TW: 0.65.

Head reddish brown. Pronotum and scutellum reddish brown. Elytra predominantly red, with wide black band along basal and lateral margins, band on lateral margins expanded at middle and apex of elytra. Elytra additionally with two black rounded spots at middle and apex of suture, the middle one distinctly larger than apical one ( Figs 50–52 ). Underside reddish brown, middle of metaventrite dark brown, Elytral epipleuron and legs yellowish brown.

Body almost circular in outline, hemispherical, shiny and glabrous. Head frontal punctures medium, 1.0–2.0 diameters apart, with scattered short setae, interocular distance of eyes 0.58x head width ( Fig. 52 ).

Pronotal punctures fine, 1.0–1.5 diameters apart. Elytral punctures fine and sparsely distributed, similar to those on pronotum, 1.0–3.0 diameters apart, with several large punctures around the central black spot. Elytral margins very wide, visible from above.

Prosternal punctures fine, 1.0–1.5 diameters apart, with scattered long setae. Mesoventral surface shiny, punctures similar to those on prosternum, with scattered short setae. Metaventrite shiny and broad, covered by coarse and dense punctures.. Elytral epipleuron broad, complete to apex, feebly foveate to accommodate femoral tips of hind legs. Wings well-developed.

Male genitalia: Penis long and slender, strongly curved at 2/5 its length, capsule broadening basally and with a small inner process, apex rounded ( Fig. 184 ); tegmen with penis guide in lateral view stout, straight at 2/3 its length, then strongly curved and narrowing to apex, distinctly shorter than paramere ( Fig. 185 ); Apical 1/3 of parameres distinctly dilated, lamellae-shaped; penis guide in ventral view subparallel along its 4/5 length, slightly wider at middle, apical 1/5 strongly narrowed, finger-shaped ( Fig. 186 ).

Holotype: 1male, China, Yunnan: Longtan, Ximeng , [22°39.69′N, 99°35.59′E], ca 1200m, 9.v.2009 Wang XM leg ( SCAU).

Distribution. China: Yunnan.

Etymology. The specific epithet is formed from the Latin adjective dilatatus, referring to the dilated parameres.

Figures

FIGURE 298. Distribution map. S. dadugangensis sp. nov. (▲); S. dilatata sp. nov. (■); S. cinctipennis Weise, 1885 (●); S. illecebrosa sp. nov. ().

FIGURES 47 – 55. 47 – 49: S. dadugangensis sp. nov. (47) dorsal habitus; (48) lateral habitus; (49) frontal habitus. 50 – 52: S. dilatata sp. nov. (50) dorsal habitus; (51) lateral habitus; (52) frontal habitus. 53 – 55: S. cinctipennis Weise, 1885. (53) dorsal habitus; (54) lateral habitus; (55) frontal habitus. Scale bars: 0.5 mm.

FIGURES 178 – 186. 178 – 182: S. dadugangensis sp. nov. (178) abdomen; (179 – 181) male genitalia: (179) penis; (180) tegmen, lateral view; (181) tegmen, ventral view; (182) ovipositor. 183 – 186: S. dilatata sp. nov. (183) abdomen; (184 – 186) male genitalia: (184) penis; (185) tegmen, lateral view; (186) tegmen, ventral view. Scale bars: 0.1 mm.