Youtuus strigatus Gong, Yang & Chen

Gong, Nian, Yang, Lin & Chen, Xiang-Sheng, 2018, Youtuus, a new bamboo-feeding genus of the tribe Augilini with two new species from China (Hemiptera, Fulgoromorpha, Caliscelidae), ZooKeys 783, pp. 85-96 : 89-92

Youtuus strigatus Gong, Yang & Chen sp. n. Figs 5-8, 21-32

Measurements.

Body length including forewing: male 5.6-5.8 mm (N = 3), female 6.9-7.1 mm (N = 3); forewing length: male 4.8-5.1 mm (N = 3), female 5.6-5.7 mm (N = 3).

Diagnosis.

Description.Coloration. Body mainly brown to dark brown (Figs 5-8, 21-23). Ocelli reddish brown, eyes black brown (Figs 21-23). Second segment of antenna with a black transverse spot near apex (Figs 22-23). Clypeus with the base and apex pale yellowish brown (Figs 22-23). Pronotum and mesonotum with areas along middle line pale yellow (Figure 21). Forewing grayish white, subhyaline, with a large dark brown transverse stripe from base of anterior margin to middle of posterior margin and a narrow dark brown longitudinal stripe from apical third to apical margin (Figs 5-8). Hindwing hyaline, veins brown. Procoxae and mesocoxae with basal half dark brown, apical half light brown; hind legs with basal half of postcoxae dark brown, others pale yellow (Figs 6, 8). Abdominal sternites yellowish brown with lateral margins fuscous (Figs 6, 8).

Head and thorax. Width of vertex (Figure 21) including eyes as wide as pronotum. Vertex (Figure 21) shorter in middle line than broad at base (0.7:1). Frons (Figure 22) 1.2 times longer in middle line than widest part. Pronotum (Figure 21) as long in middle line as vertex. Mesonotum (Figure 21) 0.7 times as long as vertex and pronotum together in middle line. Forewing (Figure 24) 3.4 times as long as broad at widest part, ScP with two branches apically, RP single, M and CuA respectively forked in two branches apically, Pcu uniting A1 at basal 1/2 of clavus. Hindwing (Figure 25) 1.5 times as long as broad at widest part, ScP and RP single, M and CuA with two branches.

Male genitalia. Anal segment in dorsal view (Figure 26) with length 2.1 times as long as widest part; in lateral view (Figure 27) dorsal margin slightly convex, apically broadening to apical half widest, apical third abruptly narrowed, lateral margin with verruciform process at basal half. Pygofer in lateral view (Figure 27) with dorsal margin distinctly shorter than ventral margin, upper half narrow, lower half round, posterior margin obviously convex at upper third; in posterior view (Figure 28) nearly oval, with length 1.7 times longer in middle line than widest part, a pair of large tooth-like processes located above the middle of lateral margin, point to each other; in ventral view (Figure 30) subquadrate. Genital style in lateral view (Figure 27) with apical margin broadly concave, dorsal margin with apical third dorsally uplifted and branched into two stubbed processes apically, the basal one with apical margin angularly convex, the apical one with apical margin roundly convex; in ventral view (Figure 30) nearly rectangle, with basal third widest; in posterior view (Figure 29) with base disciform, apex swollen, tongue-shaped. Penis in lateral view (Figure 31) near base of phallobase with an irregular ring structure, of which base angularly convex, aedeagus with apex S-shaped. Connective in lateral view (Figure 31) straight and slender, fused with base of aedeagus.

Type material.

Holotype: ♂, China: Guizhou Province, Suiyang County, Kuankuoshui National Natural Reserve (28°14'N, 107°00'E), on bamboo, 13 July 2017, Ya-Lin Yao; paratypes: 4 ♂♂, 6 ♀♀, data same as holotype, Nian Gong, Yong-Jin Sui and Yan Zhi; 2♂♂, 5♀♀, China: Guizhou, Duyun City, Doupengshan (26°15'N, 107°31'E), on bamboo, 9 June 2017, Liang-Jing Yang and Ya-Lin Yao.

Host plant.

Bamboo ( Chimonobambusa Makino) (Figure 34).

Distribution.

Southwestern China (Guizhou).

Etymology.

The specific name is derived from the Latin words “striga”, referring to its color of the forewing.