Nigrimacula Shi, Bian & Zhou, 2016

Cui, Peng, Liu, Qing & Shi, Fu-Ming, 2021, Notes on the genus Nigrimacula Shi, Bian & Zhou, 2016 (Tettigoniidae: Meconematinae: Meconematini) from Yunnan, China with two new species, Journal of Natural History 55 (15 - 16), pp. 969-977 : 970-971

Genus Nigrimacula Shi, Bian & Zhou, 2016

Type species

Xizicus (Axizicus) xizangensis Jiao & Shi, 2013 , by original designation.

Generic diagnosis

Body small. Fastigium verticis black; pronotum short and humeral sinus conspicuous; disc with a wide yellowish brown stripe along midline, with a pair of blackish brown spots on anterior area and with or without a pair of blackish brown spots on metazona. Apical area of metafemur genicular lobules bluntly rounded; metatibia with a pair of dorsal apical spurs and 2 pairs of ventral apical spurs. Tegmen long and distinctly surpassing beyond apex of metafemur. Hind wing slightly longer than tegmen. Posterior margin of male tenth abdominal tergite relatively straight, without process. Male cercus varying between species; male genitalia completely membranous. Ovipositor in apical half slightly curved dorsad, dorsal and ventral margins smooth, apices of ventral valvulae hook-shaped.

Key to species of the genus Nigrimacula

1. Pronotum with only 1 pair of brown spots on anterior area of dorsum ........................... 2

- Pronotum with 2 pairs of brown spots on dorsum .................................................................. 3

2. Apical area of male cercus with 2 sharp spines; female subgenital plate nearly hexagonal, lateral margins of basal half straight or nearly straight, apical half narrowing and posterior margin concave ( Shi et al. 2016, Figures 1 (j), 2(a))................................ N. binotata

- Dorsal margin of apical half of male cercus expanded into a lobe, near apical area with a denticle on ventral surface of inner side; female subgenital plate with a deep notch on posterior margin, lateral angle sharply protruding ( Wang and Liu 2018, Figures 14–27). .................................................................................................................................................... N. beybienkoi

3. Apical half of male cercus with many teeth (see Shi et al. 2016, Figures 4, 6(d)).......... 4 - Apical half of male cercus without any teeth............................................................................... 5

4. Base of male cercus with a digitate process on dorsal surface of inner side; apical area with 15–16 teeth; female subgenital plate nearly trapezoid, longer than broad, narrowing, and posterior margin slightly concave ( Jiao and Shi 2013, Figure 2 ; Shi et al. 2016, Figure 6(d)).......................................................................................................................... N. xizangensis

- Base of male cercus without digitate process, apical area bearing 4 processes with numerous teeth; female subgenital plate nearly pentagonal, and posterior margin angularly rounded ( Shi et al. 2016, Figure 4(I))........................ ........................ N. quadrinotata

5. Male cercus shorter and stout, bearing an inner lobe approximately trapezoid and lamellate and its apical area arch-shaped; female subgenital plate with basal area broad, narrowing, and posterior margin concave ( Figure 3 (c–f))......... ......... N. inlobata sp. nov.

- Male cercus much longer....................................................................................................................... 6

6. Male cercus with a lamellate and approximately rectangular process near middle area on ventral surface at inner side, in basal third with a lamellate process on dorso-internal margin; female subgenital plate in basal half broadly rectangular, apical half narrowing, and posterior margin nearly straight ( Figure 1 (c–e))............................ N. laminata sp. nov.

- Male cercus with only a short process on inner side.................................................................. 7

7. Male cercus bearing in basal third a protuberance-like process; apical area bifurcated in lateral view; female subgenital plate narrowing, posterior margin with a shallow concavity............................................................ ............................................................ N. paraquadrinotata

- Male cercus with a short blunt process in centre of inner surface; apical area bluntly rounded and not bifurcated; female subgenital plate with basal half broad, apical half narrowing and posterior margin with a shallow concavity............. ............. N. sichuanensis

Figures

Figure 1. Nigrimacula laminata Cui, Liu & Shi sp. nov., male: (a–b) head and pronotum: (a) dorsal view; (b) lateral view; (c–e) abdominal apex: (c) dorsal view; (d) ventro-lateral view; (e) lateral view; female: (f) ovipositor in lateral view; (g) subgenital plate in ventral view.

Figure 2. Male habitus of Nigrimacula laminata Cui, Liu & Shi sp. nov.: (a) dorsal view; (b) lateral view.

Figure 3. Nigrimacula inlobata Cui, Liu & Shi sp. nov., male: (a–b) head and pronotum: (a) dorsal view; (b) lateral view; (c–f) abdominal apex: (c) dorsal view; (d) dorso-apical view; (e) lateral view; (f) ventral view; female: (g) subgenital plate in ventro-lateral view; (h) subgenital plate in ventral view; (i) ovipositor in lateral view.