Sinosticta sylvatica sp. nov.

(Figs. 1–9)

Material. Holotype: 3, China, Hainan, Diaoluoshan Nature Reserve, N 18° 39.978΄, E 109°55.954΄, 620m, 29-V-2007, leg. Xin Yu. Paratype: 1 3, China, Hainan, Yinggeling Nature Reserve, Hongmao, N 19°04.343΄, E 109°31.687΄, 470m, 25-V-2007, leg. Xin Yu. Holotype and Paratype will be deposited at Institute of Entomology, Life Sciences College of Nankai University, Tianjin, China.

Etymology. Species epithet is in reference to a deep forest where the new species was collected.

Description. Male. Labium, labrum, bases of mandibles, and genae yellow; anteclypeus and most parts of postclypeus greenish-blue, base of postclypeus black; frons black, with two large pale greenish-blue spots on each side (Fig. 7); vertex including antennae black, with two small yellow spots distal to each lateral ocellus (Fig. 2); postocular spots blue; postoccipital stripe absent. Anterior lobe of prothorax (Fig. 3) blue; middle lobe black dorsally, with two large circular pale blue spots each sides, and yellow laterally; posterior lobe black; synthorax (Fig. 2) black dorsally, with yellow antehumeral stripe; sides yellow, with a black stripe along mesothoracic pleural suture; legs pale yellow, with brown stripes on extensor surfaces of femora and tibiae; wings hyaline; pterostigmata deep brown, braced, each covering two cells; wing base sclerites blue. Abdomen black, with yellow and blue as follows: lateral of S1-2, lateral 0.80 of S3-8 yellow; S9-10 blue dorsally. Cerci blue, longer than S10, a little longer than black paraprocts (Figs. 4–6). Head of genital ligula round, with digit-like apical lobes, short lateral branch on each apical lobe (Figs. 8–9).

Measurements (mm): abdomen + appendages 40.0; hind wing 29.0.

Diagnosis. This new species is similar to Sinosticta debra in body size and coloration pattern, but differs by cerci a little longer than paraprocts, cerci apex acuter than S. debra and without subdistal inner horns. Also, unlike S. debra, the new species lacks narrow black stripe along the third lateral suture (Fig. 2) but has a pair of large pale colored spots on the frons (Fig. 7).