Youtuus erythrus 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 : 86-89

Youtuus erythrus Gong, Yang & Chen sp. n. Figs 1-4, 9-20

Measurements.

Body length including forewing: male 5.7-5.9 mm (N = 3), female 6.2-6.6 mm (N = 3); forewing length: male 4.3-4.8 mm (N = 3), female 4.8-5.3 mm (N = 3).

Diagnosis.

Description.Coloration. Body mainly orange-red to red (Figs 1-4, 9-11). Ocelli reddish brown, eyes black brown (Figs 9-11). Second segment of an tenna with a black transverse spot near apex (Figs 10-11). Clypeus brown (Figs 10-11). Forewing subhyaline, veins red (Figs 1-4). Hindwing hyaline, veins orange-red. Procoxae and mesocoxae dark brown, others light brown; hind legs with basal half of postcoxae dark brown, others pale yellow (Figs 1-4). Abdominal sternites with lateral margins fuscous (Figs 2, 4).

Head and thorax. Width of vertex (Figure 9) including eyes as wide as pronotum. Vertex (Figure 9) shorter in middle line than broad at base (0.8:1). Frons (Figure 10) 1.1 times longer in middle line than widest part. Pronotum (Figure 9) shorter in middle line than vertex (1:1.2). Mesonotum (Figure 9) 0.8 times as long as vertex and pronotum together in middle line. Forewing (Figure 12) with length 3.4 times than broad at widest part, ScP with three branches, RP single, M and CuA respectively forked in two branches apically, Pcu uniting A1 at basal 2/5 of clavus. Hindwing (Figure 13) 1.5 times as long as broad at widest part, ScP, RP and M single, CuA with two branches.

Male genitalia. Anal segment in dorsal view (Figure 14) with length 2.7 times as long as widest part; in lateral view (Figure 15) slender with dorsal margin sinuate, apically broadening to apical third, thence abruptly narrowed, lateral margin with verruciform process at basal third. Pygofer in lateral view (Figure 15) with dorsal margin distinctly shorter than ventral margin, upper half narrow, lower half wide, in posterior view (Figure 16) nearly oval, with length 2.0 times as long as widest part; in ventral view (Figure 18) with posterior margin roundly convex, anterior margin slightly concave. Genital style in lateral view (Figure 15) nearly hook-like, outer surface with a small tooth process, apex sharp, directed basad; in ventral view (Figure 18) nearly rectangle, with apex widest; in posterior view (Figure 17) with dorsal 1/3 avicular, ventral 2/3 clavate. Penis in lateral view (Figure 19) with a round ring structure near base of phallobase, a tooth-like process located at the ring inner-ventral margin, aedeagus with apex hook-shaped. Connective (Figure 19) straight and stub, fused with base of aedeagus, near its apical side with a short tooth process at base.

Type material.

Holotype: ♂, China: Guizhou Province, Xishui County, Donghuang (28°33'N, 106°20'E), on bamboo, 27 September 2017, Bin Yan; paratypes: 10 ♂♂, 17♀♀, data same as holotype, Hong-Li He and Nian Gong.

Host plant.

Bamboo ( Phyllostachys Sieb. et Zucc.) (Figure 33).

Distribution.

Southwestern China (Guizhou).

Etymology.

The specific name is derived from the Latin words “erythros”, referring to the color of the frons.

Remarks.

This new species is closely related to Y. strigatus Gong, Yang & Chen, sp. n., but differs in: 1) body mainly orange-red to red (brown to dark brown in strigatus ); 2) male pygofer in posterior view without pair of processes (with pair of processes in strigatus ); 3) lateral margin of anal segment bearing verruciform process at basal third (at basal half in strigatus ).