Libnotes (Libnotes) wanensis, Men, 2015

Men, Qiu-Lei, 2015, Two new species of the genus Libnotes Westwood (Diptera: Limoniidae) from China, with a key to Chinese species, Zoological Systematics 40 (1), pp. 79-85 : 82

Libnotes (Libnotes) wanensis sp. nov. ( Figs 1–4 )

Length. Body, male 9.8–10.0 mm (n= 2). Wing, male 16.3–16.5 mm (n= 2).

Rostrum black throughout, relatively short, about equal in length to head; palpi black; eyes black; antennae with scape black and elongate, four to five times longer than pedicel, cylindrical, pedicel black and spherical, flagellum light brown with flagellomeres one to five spherical, gradually smaller, remainder of flagellomeres cylindrical. Head light brown.

Pronotum light brown. Prescutum with ground color festucine-yellow, patterned with a broad median stripe, almost extending entire length of prescutum, lateral borders of median stripe with a pair of lateral stripes, black and extending to mid-length of prescutum ( Fig. 2 ); scutal lobes light brown, with a pale stripe in middle; scutellum yellow; postnotum black. Pleura festucine-yellow, with a narrow black longitudinal stripe extending from propleura dorsad to wing-root, with a narrow black stripe on mesepisternum ( Fig. 1 ). Halteres with stem brown, knob black. Legs with coxae and trochanters yellow; femora festucine-yellow, tips black; tibiae pale yellow, tips narrowly black; tarsi pale brown ( Fig. 1 ). Wings suffused with ground color pale yellow, a series of patterns along veins: Sc with a spot at tip, R 1 with a spot at same level of spot on Sc, with another two spots near apex, Rs with pattern at origin, R 2+3 and R 4+5 respectively with three spots along veins at apical part, M 1+2 with a stripe along vein near tip, remainder of marks illustrated as Fig. 1 . Veins pale yellow, black in clouded areas ( Fig. 1 ). Venation: Rs unusually straight and oblique, Sc ending beyond fork of Rs, R 2+3 slightly longer than R 4+5, R 2+3 parallel to R 4+5, M 1+2, M 3 and CuA 1 at apical part ( Fig. 1 ).

Abdominal segments festucine-yellow, lateral margins of tergites very narrowly pale ( Fig. 1 ). Hypopygium ochreousyellow. Male hypopygium with ninth tergite broad, rounded at caudal margin ( Fig. 4 ). Gonocoxite narrow, approximately as long as inner gonostylus, with ventromesal lobe slender and finger-shaped ( Figs 3–4 ). Inner gonostylus very large, oval, a pale lobe on surface near base, tip of lobe with a wisp of long setae, rostral prolongation relatively slender, terminating into a curved spine ( Figs 3–4 ). Outer gonostylus hook-shaped, curved at end, uniformly thick except slightly expanded base ( Figs 3–4 ). Paramere with mesal-apical lobe slender and curved ( Figs 3–4 ). Aedeagus relatively thick, expanded and bifid at apex ( Figs 3–4 ).

Remarks. This new species is similar to another Chinese species L. (L.) tszi ( Alexander, 1949) by the presence of two stripes on pleura, and by the colorations of the antennae and abdomen. It can be easily distinguished from the latter by the femora festucine-yellow, without subterminal ring as shown in Fig. 1 (femora yellow, all with a pale brown subterminal ring that is from 3 to 4 times as broad as the yellow tip in L. (L.) tszi as described by Alexander, 1949: 531), and by the absence of band between arculus and origin of Rs as illustrated in Fig. 1 (a broad and virtually continuous subbasal brown band at near mid-distance between arculus and origin of Rs in L. (L.) tszi as described by Alexander, 1949: 531).

Material examined. Holotype male, China, Anhui Province, Yuexi, Yaoluoping National Nature Reserve (elev. 900 m), 14 August 2013, coll. Qiu - Lei Men. Paratype 1 male, same data as holotype, 16 August 2013 .

Distribution. China (Anhui).

Etymology. The specific epithet is a noun ‘ wan ’, the abbreviation of Anhui Province, with Latin suffix ‘ ensis ’, referring to the distribution of new species.

Figures

Figs 1–4. Libnotes (Libnotes) wanensis sp. nov. 1. Habitus of male adult, lateral view. 2. Thorax, dorsal view. 3. Hypopygium, ventral view. 4. Hypopygium, dorsal view. Abbreviations: aa, anterior arculus; aed, aedeagus; goncx, gonocoxite; i gonst, inner gonostylus; o gonst, outer gonostylus; pm, paramere. Scale bars: 1=5.0 mm, 2=1.0mm, 3–4 =0.5mm.