First record of the cicada genus Semia Matsumura (Hemiptera, Cicadidae) from Vietnam, with the description of one new species and a key to species

Abstract The first record of the genus Semia Matsumura (Cicadidae: Cicadinae, Cicadini) from Vietnam is presented. One new species, Semia spinosa sp. n., is described from southern Vietnam. Photos of the adult, illustrations of the male genitalia, a distribution map and biological data are provided. A key to the species of Semia based on the male adults is also given.


Introduction
The cicada fauna of Vietnam has received little attention since the descriptions of Distant (1913aDistant ( , b, 1917a. According to previous reports, 133 cicada species are known from Vietnam, representing 45 genera in all three subfamilies, Cicadinae, Cicadettinae and Tet-tigadinae (Lee (2008), Yang (2009, 2010) and ). So far only two species of Semia have been described, S. watanabei (Matsumura, 1907), the type species, from Taiwan and S. klapperichi Jacobi, 1944, from Fukien Province, China. Here we describe a third species, Semia spinosa sp. n., from Dong Nai Province, southern Vietnam.
Semia is similar to Leptosemia Matsumura, 1917, Terpnosia Distant, 1892and Euterpnosia Matsumura, 1917, but has a dentate lateral margin to the pronotum ( Fig.  2A), transverse male opercula that are nearly contiguous with each other (Fig. 2B) and lacks a tooth-like projection laterally on the male 4 th abdominal segment (Lee and Hayashi 2003).

Materials and methods
Four males of the new species Semia spinosa sp. n., were collected from the Phu Ly, Ma Da-Vinh Cuu Nature reserve (NR), Vinh Cuu district, Dong Nai Province in southern Vietnam. The holotype and two paratypes are deposited in the Institute of Ecology and Biological Resources, Hanoi, Vietnam (IEBR), and one paratype in the Natural History Museum, London (BMNH).
Diagnosis. Head nearly as wide as or slightly narrower than base of mesonotum; inner area of pronotum generally concolorous to outer dilatation; male abdomen cylindrical, much longer than distance from head to cruciform elevation and slightly widest across 4th abdominal segment and wider than base of mesonotum; male tymbal cover very small and semicircular, mostly exposing tymbal in dorsal view; male 8th abdominal tergum mostly covered with white powder; ovipositor not protruding beyond abdominal segment 9; male operculum scale-like, roundish, and not extending beyond 2nd abdominal sternum; wings hyaline; 6th apical cell of forewing about as long as or longer than twice of 5th apical cell in median length. Based on Lee and Hayashi (2003    Thorax (Figs 2A, 2B): pale yellowish-green, longitudinal broad band on pronotum narrowed centrally, longitudinal broad band on mesonotum, spot between submedian and lateral sigillae, scutal depression, two spots on lateral margin of mesonotum, central area of cruciform elevation, second anepisternum, anepimeron and katepisternum, dark brown. Pronotal collar with a small dentate projection.
Wings ( Fig. 2A): fore and hind wings hyaline, with veins brown or fuscous, and costal margin tawny; fore wings slightly tinged and spotted with infuscations on most veins.
Legs (2B): pale yellow with markings as follows: fore leg with femur, tibia, metatarsus and pretarsus blackish brown, primary spine of femur dark brown, secondary spine   dark brown; mid leg with coxa and femur pale yellow, tibia pale brown, apex of femur black, apex and base of tibia black, metatarsus and pretarsus dark brown, mesotarsus pale yellow; hind leg, with femur pale yellow, apex of femur dark brown, tibia pale brown, base of tibia dark brown, tibial spur, tibial comb, and thumb of tibial comb dark brown.
Male genitalia (Figs 3A, B): Pygofer oblong in ventral view, lateral lobe of pygofer narrower than medial lobe, the latter triangular and prominent; dorsal beak acute and blackish brown; uncus brown, darker at apex of uncus lobes, the latter strongly divergent with two apical spines, medial spine shorter and acuter than lateral spine; Anal styles and anal tube dark brown. Aedeagus very slender.
Distribution. Vietnam (Dong Nai Province). Remarks. S. spinosa is distinguishable from S. watanabei and S. klapperichi by the body size, which is shorter than 30mm (in male) in S. spinosa and longer than 35mm (in male) in S. watanabei and S. klapperichi, and from S. klapperichi it differs in the infuscations on the hind wings which lack spots along the ambient veins present in S. klapperichi (see Figs 4A, C). The new species also differs in the structure of the uncus which has the lobes strongly divergent with acute apical spines (see Figs 6A-C).