Arcifrons Ding & Yang, 1986

Li, Hong-Xing, Yang, Lin & Chen, Xiang-Sheng, 2019, Redescription of Arcifronsarcifrontalis Ding & Yang, 1986 (Hemiptera, Fulgoromorpha, Delphacidae), ZooKeys 825, pp. 145-152 : 146-148

Arcifrons Ding & Yang, 1986

Arcifrons : Ding and Yang 1986: 421; Ding 2006: 124.

Type species.

Arcifrons arcifrontalis Ding & Yang, 1986, by original designation.

Differential diagnosis.

The genus is readily distinguished from other genera in the tribe Tropidocephalini by the following features: frons distinctly sharply pointed at apex in dorsal view (Figs 1, 3, 5) and distinctly inclined anteriorly in lateral view (Figs 2, 4, 7), with median carina distinctly developed (Fig. 6); postclypeus with median carina distinct (Fig. 6).

Description.

The distinctive characters used by Ding (2006) are modified as follows.

Head and thorax.

Head including eyes narrower than pronotum. Vertex broad transversely, with basal compartment near trapezoidal (Fig. 5). Frons elongate, rectangular, longer in middle line than wide at widest part, lateral carinae subparallel, median carina distinctly developed, forked at base (Fig. 6), with distinctly sharply pointed at apex in dorsal view (Fig. 5) and distinctly inclined anteriorly in lateral view, with apical margin roundly convex (Fig. 7). Postclypeus with median carina distinct, lateral carinae absent, width at base slightly wider than frons at apex. Antennae short, cylindrical, reaching to frontoclypeal suture, with basal segment with length longer than width, shorter than second segment (Fig. 6). Pronotum longer than vertex, tricarinae distinct, lateral carinae reaching hind margin, with base curved inward, with posterior apex more closed anterior apex of lateral carinae of mesonotum. Mesonotum developed, tricarinae distinct, median carina complete, reaching tip of scutellum, lateral carinae reaching hind margin (Fig. 5). Spinal formula of hind leg 5-6-4. Hind tibiae with a lateral tooth basally and medially respectively. Post-tibial spur without teeth along hind margin, but with a small apical tooth, with inner side surface concave.

Male genitalia.

Anal segment (Fig. 9) ring-like. Pygofer with ventral margin longer than dorsal margin in lateral view (Fig. 10), mediovental processes distinct (Fig. 9). Aedeagus (Fig. 11) with phallobase distinct. Genital styles (Figs 12, 13) simple, long.

Host plants.

Bamboo.

Distribution.

Oriental Region (China).

Remarks.

This genus is similar to Arcofaciella Fennah, 1956 but differs from it by: frons with median carina distinctly developed, with lateral carinae subparallel (frons with median carina not delveloped, with lateral carinae arched in Arcofaciella ); postclypeus with median carina developed (postclypeus with median carina absent in Arcofaciella ); spinal formula of hind leg 5-6-4 (spinal formula of hind leg 5-8-5 or 5-9-5 in Arcofaciella ); anal segment of male with two processes large and lamellate (anal segment of male with two processes short and spinous in Arcofaciella ).

This genus is also similar to Mucillnata Qin & Zhang, 2010 but differs from it by: frons distinctly inclined anteriorly in lateral view (frons not distinctly inclined anteriorly in lateral view in Mucillnata ); lateral carinae of the pronotum not diverging and attaining the hind margin (lateral carinae of the pronotum diverging and not at taining the hind margin in Mucillnata ); pygofer of male with ventral margin with two processes (pygofer of male with a medioventral process in Mucillnata ); anal segment of male with two lateral processes (anal segment of male with single process on the caudoventral margin on right side in Mucillnata ).