Elasmoscelis fuscofasciata Stål, 1854

Body length (from apex of vertex to tip of forewings) less than 10 mm, size medium. Head short, approximately trapezoidal, ratio width of vertex from base to length in middle line 1.6, narrower than pronotum; vertex broader than long, anterior margin straight in dorsal view and not produced anteriorly beyond proximal margin of eyes, lateral margins with carinate, with an obsolete median longitudinal carina. Frons with lateral carinae, and with sublateral carinae fused apically, and without median carina. Rostrum extending to meso-trochanter, with ratio subapical to apical segment 2.0. Pronotum slightly longer than vertex, anterior margin roundly produced, posterior margin approximately straight, tricarinate on disc, lateral areas curved down. Mesonotum broad, with tricarinate on disc. Forewings broadly round at apex, outer and inner margins nearly parallel, precostal area with many oblique transverse parallel crossveins; hindwings narrower than forewings. Legs moderately long, fore femora and tibiae foliaceous. Hind tibiae with 3 lateral spines and 3–4 rows with more than 70 small spines apically, apical spines of first hind tarsal segment separated by a pad of microsetae.

Head pale luteous, suffused with piceous brown. Eyes black brown. Frons brown and anteclypeus piceous brown. Antennae black brown. Rostrum yellowish brown. Forewings semiopaque, with three broad fuscous transverse band and irregularly piceous spots; hindwings semihyaline. Fore and middle legs blackish brown; hind legs luteous, pad yellowish. Abdomen piceous brown.

Male genitalia. Pygofer short, upper 1/3 very narrow in lateral view, without appendage. Anal tube longer than pygofer, apex forked in caudal view. Genital styles short to long, dorsolateral with a small hook or a finger-like process near posterior margin. Aedeagus with 2 dorsally directed, spinose processes, dorsally directed at medioventral margin; near base of aedeagus on dorsal side or mediolateral of aedeagus with 2 spinose processes or not; base of aedeagus on dorsal side with 1 spinose process or not, and each base laterally of aedeagus with 1 processes or not.

The genus Lacusa resembles Pitambara Distant, 1906 and Sarebasa Distant, 1909 in having the vertex not produced anteriorly beyond proximal margin of eyes, apical spines of first hind tarsal segment separated by a pad of microsetae, and frontal disc not longitudinally deeply concave, but differs from these genera by the characters noted in Table 1.

China, India, Nepal, Burma, Thailand.

1♂, China: Guizhou Province, Jiangkou County, Fanjingshan National Natural Reserve, 24 September 2011, coll. Weibin Zheng (GUGC); 26♂♂14♀♀, China: Guizhou Province, Wangmo County, 19 August 2012, coll. Zhimin Chang, Weibin Zheng, Jiankun Long and Weicheng Yang (GUGC); 4♂♂1♀, China: Guizhou Province, Ceheng County, 25 August 2012, coll. Zhimin Chang, Weibin Zheng and Jiankun Long (GUGC); 2♂♂, China: Guizhou Province, Luodian County, 16 May 2013, coll. Jiankun Long (GUGC); 6♂♂6♀♀, China: Hainan Province, Jianfengling National Natural Reserve, 9 April 2013, coll. Jiankun Long, Jichun Xing and Yubo Zhang (GUGC); 1♂, China: Yunnan Province, Ruili City, Nongdao, 15 July 2013, coll. Haiyan Sun (GUGC).

China (Yunnan, Guizhou, Guangdong, Hainan), India, Nepal, Burma, Thailand.

Chou & Huang (in Chou et al. 1985) described a new species Lacusa yunnanensis from Menglun, Xishuangbanna, Yunnan Province, China, based on one female specimen, and they noted that Lacusa yunnanensis was closely related to Lacusa fuscofasciata, but that it could be distinguished from it by the fuscous transverse band near outer margin on forewing branched and the fuscous meso- and metathorax. Later, Liang (1996) proposed Lacusa yunnanensis as a junior synonym of Lacusa fuscofasciata based on examination of specimens from Yunnan, Guizhou, Guangdong and Hainan Provinces in China.

Body length (from apex of vertex to tip of forewings) of male specimen from Guizhou and Hainan Provinces, relatively small about 6.9 mm, but male specimen from Yunnan Province relatively larger about 8.0 mm.

Body length (from apex of vertex to tip of forewings): male 8.5–8.7 mm (n=2).

Color pattern of anterior dorsum and face as in Figs 11–15. Pronotum and mesonotum yellowish brown. Tegula yellowish. Ocelli red. Apical margin of forewings maculately piceous. External features as in generic description.

Male genitalia. Pygofer short, upper 1/3 very narrow in lateral view, dorsal margin strongly concave (Fig. 19). Anal tube in dorsal view with ratio length to maximum width 3.0 (Fig. 20). Genital styles long, apex approximately round in lateral view, dorsolateral with a finger-like process near posterior margin (Fig. 19). Aedeagus with 2 dorsally directed, spinose processes, dorsally directed at medioventral margin, and exceed the end of aedeagal shaft; near base of aedeagus on dorsal side of aedeagus with 2 short spinose processes; base of aedeagus on dorsal side with 1 short spinose process (Figs 21, 22).

Holotype: ♂, China: Yunnan Province, Ruili City, Mengla County, Moli, 5 June 2011, coll. Jiankun Long (GUGC); paratypes: 1♂, Yunnan Province, Lianghe County, Mengyang, 27 July 2013, coll. Zhihua Fan (GUGC).

This species is similar to Lacusa fuscofasciata (Stål, 1854) but can be distinguished by the base of aedeagus on dorsal side with one spinose process, near base of aedeagus on dorsal side with two short spinose processes, the anal tube relatively short, and the genital styles much more long.

The species name is derived from the Latin word “digitata”, indicating that the genital style dorsolateral with a finger-like process near posterior margin.

Body length (from apex of vertex to tip of forewings): male 9.2–9.3 mm (n=3).

Color pattern of anterior dorsum and face as in Figs 23–27. General appearance as in Lacusa digitata sp. n., but the body much larger.

Male genitalia. Pygofer short, upper 1/3 very narrow in lateral view, dorsal margin strongly concave, posterior margin angle producted near the middle; (Fig. 28). Anal tube in dorsal view with ratio length to maximum width 4.1 (Fig. 29). Genital styles long, apex approximately round in lateral view, dorsolateral with a small hook process near posterior margin (Fig. 28). Aedeagus with 2 dorsally directed, spinose processes, dorsally directed at medioventral margin, and exceed the end of aedeagal shaft; mediolateral of aedeagus with 2 long spinose processes; base of aedeagus on dorsal side with 1 spinose process (Figs 30, 31).

Holotype: ♂, China: Yunnan Province, Xishuangbanna, Mengla County, Mohan, 25 July 2013, coll. Jichun Xing (GUGC); paratypes: 2♂♂, Yunnan Province, Xishuangbanna, Mengla County, Mohan, 25 July 2013, coll. Yuan Liu and Yangyang Liu (GUGC).

This species is similar to Lacusa digitata sp. n. but can be distinguished by the mediolateral of aedeagus with two long spinose processes, genital style dorsolaterally with a small hook process near posterior margin, the anal tube relatively long.

The species name is derived from the Latin word “producta”, indicating that the mediolateral of aedeagus with two long spinose processes.