Dialarnaca quadrateprocera Bian, Zhu et Shi, 2017

Bian, Xun, Zhu, Qidi & Shi, Fuming, 2017, Two new species of Gryllacridinae (Orthoptera: Gryllacrididae) from Yunnan, China, Far Eastern Entomologist 338 (338), pp. 1-9 : 4-5

Dialarnaca quadrateprocera Bian, Zhu et Shi , sp. n.

Figs 1–18

TYPE MATERIAL. Holotype – male, China: Yunnan, Jinghong, Mengyang ,

8.IX 2016, coll. Xun Bian. Paratypes: China: Yunnan, 1 ♀, the same data as in holotype; 1 ♂, 1 ♀, Jinghong, Mengyang , 7.X 2016, coll. Xun Bian; 1 ♂, Pu'er,

Laiyanghe, 26.VIII 2009, coll. Ming Qiu and Ruilian Li.

DESCRIPTION. MALE. Fastigium verticis obtusely rounded, about 1.2 times wider than scape ( Figs 1 , 13 ). Eyes oval; ocelli nearly distinct, medium ocellus nearly equal to lateral ocelli ( Figs 1 , 13 ). Apical segments of maxillary palpi almost equal to subapical ones, apices slightly inflated.

Anterior margin of pronotum slightly protruding in the middle, posterior margin almost straight ( Figs 2 , 14 ); lateral lobes longer than high, rectangular ( Figs 3 , 15 ).

Fore coxae with 1 small spine on external margin. Fore and middle femora unarmed on ventral surface, tibiae with 4 pairs of spines and 1 pair of apical spines on ventral surface; middle tibiae with 1 internal apical spine on dorsal surface. Hind femora armed ventrally with 13 internal and 6–7 external spines; tibiae with 4 internal and 5–6 external spines on dorsal surface, apices with 1 pair of dorsal spines and 2

pairs of ventral spines, subapices with 1 pair of spines on ventral surface.

Tegmina obviously surpassing apex of abdomen, extending to apices of hind tibiae; hind wings slightly longer than tegmina.

Middle of posterior margin of 9th abdominal tergite protruding backward, apex curved ventrally, with numerous teeth ( Fig. 4 ). Middle of posterior margin of 10th

abdominal tergite with 1 pair of rectangular processes, curved inward, apices distinctly sclerotized ( Figs 5 , 16 ). Cerci slender and long, rolled, conical ( Fig. 17 ).

Basal area of subgenital plate broad, narrowing, posterior margin obtusely rounded

( Figs 17, 18 ). Styli nearly cylindrical, located on both sides of subapical area of subgenital plate ( Fig. 17 ).

FEMALE. Body is similar to male. Cerci slender and long, pointing dorso-

inwards ( Fig. 9 ). Centre of posterior margin 6th abdominal sternum with 1 small process, directing upward, its apex obtusely rounded ( Fig. 11 ). The 7th abdominal sternum semimembranous, posterior margin almost straight ( Fig. 11 ). Subgenital plate trapezoidal, basal area broad, narrowing to apex, lateral margin arc, posterior margin relatively straight, middle area slightly concave ( Figs 10, 11 ). Ovipositor long,

curved upward, dorsal and ventral margin smooth, apices slightly acute ( Fig. 12 ).

COLORATION. Body yellowish brown. Eyes black, ocelli light yellow. Fastigium verticis with 1 black spot. Occiput with 1 black spot. Antennal flagellum blackish brown. Disc of pronotum with red spots. Spines of fore and middle tibiae blackish brown, their apices yellow, apical spines yellowish brown. Spines of hind femora and tibiae black, apical spines yellowish brown. Fore and middle tibiae, and hind femora and tibiae light red. Apices of processes of 10th abdominal tergite black.

MEASUREMENTS (mm). Length of body: ♂ 15.5–18.9, ♀ 19.0–19.7; pronotum: ♂ 3.7–4.0, ♀ 5.1–5.2; tegmina: ♂ 21.9–22.3, ♀ 23.0–23.8; hind femora: ♂

11.8–12.4, ♀ 14.6–15.5; ovipositor: 17.8–18.2.

DISCUSSION. This species is similar to Dialarnaca longicerca Shi et Bian,

2016, but differs from the latter in: body yellowish brown, disc of pronotum with red spots, centre of posterior margin of male 10th abdominal tergite with a pair of short rectangular processes.

ETYMOLOGY. The new name derives from male 10th abdominal tergite with rectangular processes.

head and pronotum (14 – dorsal view; 15 – lateral view); 16–18 – apex of abdomen (16 – apical view; 17 – ventral view; 18 – ventro-apical view).

Figures

Figs. 1–12. Dialarnaca quadrateprocera sp. n., male (1–5) and female (6–12). 1, 6 –

Figs. 13–18. Dialarnaca quadrateprocera sp. n., male. 13 – head, frontal view; 14–15 –