One new species of the subgenus Hexatoma (Eriocera) Macquart (Diptera, Limoniidae) from China with a key to Chinese species

Abstract One new species of the subgenus Eriocera Macquart, 1838, Hexatoma (Eriocera) cleopatroides Men, sp. n. (Southern China: Anhui) is described and illustrated. A key to all of 78 known species from China in the subgenus is provided, which was solely based on literatures. The new species is similar to Hexatoma (Eriocera) cleopatra Alexander, 1933, but distinguishes from the latter by the prescutum entirely black with two ill-defined gray stripes, by the legs with fore and middle femora brown in basal half, black in apical half, with hind femora brown in basal one-fourth, and by the wings with cells c and sc more yellowish brown than the ground color.

While sorting and identifying crane flies collected from Yaoluoping National Nature Reserve, Anhui Province, China, we found one new species of the subgenus Eriocera. In the present paper, we describe and illustrate the new species. In addition, a key for separating the known species from China is provided.

Material and methods
The specimens examined in this study were collected during scientific exploration in Yaoluoping National Nature Reserve, Anhui Province, undertaken by undergraduates and author. The genital segments of the specimens were removed and soaked in 10% NaOH overnight and observed or drawn in glycerin jelly using a Leica MZ125 (Leica, Germany) stereomicroscope. The measurements were made with the aid of a digital caliper. All measurements are in millimeters (mm). The terminology and methods of description and illustration follow that of Alexander and Byers (1981), and Ribeiro (2006).
In the present study, no specimens of the other known species were available for examination. However, there is no doubt concerning the identity of those species because the descriptions and illustrations were very clear and detailed. The examined specimens of the new species are deposited in the animal specimen room, School of Life Sciences, Anqing Normal University, Anqing, Anhui Province, China. The key was constructed from the literatures. Abdomen black, tergites two, four and five with leaden basal bands (see Ed- Legs with coxae and trochanters black, remainder of legs dark brown; cell m 1 present; hypopygium orange (see Alexander 1942: 183, fig. 4)  Head. Rostrum dark brown with dark brown nasus. Vertex and occiput blackish. Setae on head black. Antenna 7-segmented in both sexes, relatively short, if bent backward not extending to the root of halteres (Fig. 1); scape black, elongated; pedicel black, very short; flagellum yellow, the first flagellomere longest, the remainder progressively shortened (Fig. 1). Verticils black, shorter than flagellomeres. Palpi black, the setae on palpi black. Tubercle enlarged (Fig. 1).
Thorax. Pronotum black. Prescutum black with two ill-defined grayish stripes. Scutum and scutellum black. Pleura deep brown. Setae on thorax mainly distributed on the lateral side of the prescutum. Coxae black; trochanters black; fore and middle femora brown in basal half, black in apical half (Fig. 1); hind femora brown in basal one-fourth, the remainder black (Fig. 1); tibiae dark brown, black at apex; tarsi black. Tibia spurs black with 2-2-2 in number. Setae on coxae and trochanters long, black, the remainder relatively short. Wings with ground color light brown, more yellowish brown in cells c and sc; stigma inconspicuous; wing with apex blackish, the basal half of wing except the extreme base also blackish (Fig. 1). Sc ending beyond the fork of R 2+3+4 ; R 2+3 distinctly shorter than R 3 ; cell m 1 present, asymmetrical, slightly longer than its petiole (Fig. 1). Halteres entirely black.
Remarks. This new species is similar to another Chinese species Hexatoma (Eriocera) cleopatra from Sichuan by the color pattern of abdomen and wings. It can be eas-ily distinguished from the latter by the prescutum entirely black with two ill-defined gray stripes (prescutum not entirely black, the extreme cephalic portion of prescutum variegated by reddish, with only one black median vitta in H. (E.) cleopatra as described in Alexander 1933a); legs with fore and middle femora brown in basal half, black in apical half, with hind femora brown in basal one-fourth, the remainder black as shown in Fig. 1 (entirely dark brown in H. (E.) cleopatra as described in Alexander 1933a); wings with cells c and sc more yellowish brown than the ground color as illustrated in Fig. 1 (cells c and sc not darker than the ground color in H. (E.) cleopatra as described in Alexander 1933a).
Etymology. The specific epithet is an adjective based on a name of a morphologically similar species, H. (E.) cleopatra.