Kosemia yezoensis ( Matsumura, 1898 )

Qi, Shengping, Hayashi, Masami & Wei, Cong, 2015, A review of the cicada genus Kosemia Matsumura (Hemiptera: Cicadidae), Zootaxa 3911 (4), pp. 451-492 : 457-462

Kosemia yezoensis ( Matsumura, 1898)

Figures 5–8

Melampsaltria (sic) yezoensis Matsumura, 1898: 17 . Cicadetta yezoensis: Oshanin, 1908: 399 .

Cicadetta sachalinensis Matsumura, 1917: 209 . Kosemia yezoensis: Matsumura, 1927: 55 .

Melampsalta konoi Kato, 1937: 676 .

Leptopsalta yezoensis: Chou et al., 1997: 50 .

Material examined. 1♂ ( NWAFU), Qinghai Prov., Qilian Mountain, vii-1959, coll. Zhang Yiran; 8♂, 1♀ ( NWAFU), Hebei Prov., Xiaowutai Mountain, 1200–1400m, 22-viii-1964, coll. Wang Chunguang; 1♂ ( NWAFU), Xinjiang Prov., Urumqi Municipality, vii-1983, coll. unknown; 1♀ ( NWAFU), Shaanxi Prov., Yan’an County, 22- vi-1983, coll. unknown; 1♀ ( NWAFU), Shaanxi Prov., Yulin County, 7-vi-2003, coll. Zhang Yalin; 1♂ ( NWAFU), Liaoning Prov., Shenyang, 27-viii-2008, coll. Sheng Maoling; 47♂, 8♀ ( NWAFU), Inner Mongolia, Helan Mountain, 1487–2400m, 10-viii-2010, coll. Zhong Haiying; 1♀ ( NWAFU), Henan Prov., Yicheng County, 19-vii- 2012, coll. Yang Mingsheng.

Additional material examined. 1♀ ( NWAFU), Heilongjiang Prov., Baimiaozi, 4-vii-1954, coll. unknown.

Description. Male. Ground color of body almost black, body (especially head and thoracic nota) densely covered with blackish hairs and sparingly covered with short yellowish metallic hairs.

Head (Figs. 5A–D). Head including eyes narrower than base of mesonotum. Paramedian posterior margin of vertex, supra-antennal plates, lateral margins of postclypeus, base of lorum all somewhat brown. Ocelli reddish orange. Eyes dark brown. Rostrum black, basal joint of rostrum yellow or brown.

Thorax (Figs. 5C–D). Pronotum almost black. Anterior and posterior margins of pronotum brownish yellow or dark brown. Median, reversed Y-shaped elevation brown or yellowish. Lateral part of pronotal collar ampliate and broadly rounded; lateral angle well ampliate posterolaterally. Mesonotum black with two central deltoid spots, lateral margin pale yellow. Cruciform elevation yellowish or light brown.

Wings (Figs. 5A–B). Wings hyaline. Fore wing with costal, basal and ulnar veins olivaceous; anal vein and apical margin dusky; basal membrane sanguineous; veins M and CuA usually meeting basal cell with their stems completely fused as one, but sometimes unstable; infuscation on fore wing cross veins weakly developed in some specimens. Hind wing plaga narrow along vein 2A to its distal end and around ambient vein of cubital cell 2 and anal cell 1; plaga on 3A and basal part of jugum also infuscated.

Legs (Fig. 5G). General color dark reddish or pale yellow, with dense, silvery short setae. Fore leg with fasciae on coxa, one or two spot(s) on trochanter, two longitudinal fasciae and tips of femur, tips and longitudinal fasciae of tibiae, all black. Fore femur with three strong spines beneath, all slightly slanted and black, decreasing in size from primary to tertiary spine; a tiny spine divided from tertiary spine.

Opercula (Fig. 5E). Operculum broadly rounded, almost pale yellow and slightly fuscous or black basally, coarsely covered with silvery pubescence. Meracanthus pale yellow with base black.

Abdomen (Figs. 5A–B, E–F). Abdomen longer than head and thorax together, gradually attenuated posteriorly. Timbal with three long ribs. Abdominal tergites almost black, furnished with short metallic yellow pile; tergites I–II almost black; posterior margins of tergites III–VII and posterior portion of tergite VIII dark yellow. Abdominal sternites dark yellow with silvery pilosity, venter with a series of median black spots; sternite VIII slightly shorter than sternite VII.

Genitalia ( Figs. 6 A–D). Pygofer almost black with basal lobe brown, furnished with long, silvery scattered pubescence and short greyish setae. Dorsal beak of pygofer slightly short and broad, pointed at apex. Upper lobe of pygofer triangular in lateral view, black in basal half, dark brown in apical half. Basal lobe of pygofer shiny brown, tending to be broadly angled in lateral view. Median lobe of uncus small, black, apex somewhat upswept in lateral view, whilst paramedian area slightly convex in ventral view. Clasper shiny dark red or black reddish, slightly elongated, digitate, meeting the other one at base then strongly separated anterolaterally; apex obtuse.

Female ( Figs. 7 A–D). Body larger and longer than male. Wings with veins somewhat lighter in hue than male. Operculum very small and generally pale yellow, coarsely covered with silvery pubescence, posterior margin rounded; meracanthus black, broadly triangular, very small. Abdominal tergites black, furnished with dense, short silvery pubescence; tergites III–VIII with posterior margins narrowly brownish yellow; tergite IX black dorsally, pale yellow or brownish yellow laterally with two stigma black. Abdominal sternites have a high degree of variability in coloration from entirely pale yellowish to brownish with a central black patch on each sternite; sternite VII with a pair of oblique, anterolateral black patches; median incision in posterior margin very deep and broad, deep to about 4/5 the length of sternite VII. Dorsal beak of pygofer black, sharp and slightly reaching beyond anal styles. Ovipositor sheath dark-reddish to black apically, reaching to or slightly beyond apex of dorsal beak. Other morphological characters similar to male.

Measurements. (10♂♂, 10♀♀), mean (range) (in mm). Body length: male 22.5 (21.1–23.5), female 23.8 (20.6–27.1); fore wing length: male 25.9 (22.0–28.0), female 27.4 (23.8–31.4); fore wing width: male 9.8 (9.0–10.3), female 10.0 (9.3–10.6); width of head including eyes: male 6.2 (5.6–6.6), female 6.5 (5.7–6.7); pronotum width (including pronotal collar): male 7.8 (6.5–8.3), female 8.1 (6.9–9.2); mesonotum width: male 6.7 (6.0–7.2), female 6.8 (5.9–7.5).

Distribution. China (Hebei, Inner Mongolia, Liaoning, Heilongjiang, Henan, Shaanxi, Qinghai, Xinjiang), Korea, Mongolia, Japan.

Remarks. This species also has some pale-colored forms ( Figs. 8 A–B) as in K. admirabilis ( Hayashi & Saisho, 2011) : dorsum of thorax with pale ochraceous area developed, venter of body more (almost entirely) pale ochraceous. However, it can be distinguished from K. admirabilis by the following characteristics: head including eyes narrower than base of mesonotum; abdomen longer than head and thorax together, male sternite VIII longer than 2/3 of sternite VII.

In addition, the female specimen from Heilongjiang Province formerly identified as K. chinensis was removed to K. yezoensis as additional material based on its body color and weak infuscation on the fore wing cross veins. The identity of this female specimen needs further investigation when more related specimens become available.

Figures

FIGURE 6. Kosemia yezoensis (Matsumura, 1898), male. A, C. male genitalia, left lateral view; B, D. male genitalia, ventral view.

FIGURE 7. Kosemia yezoensis (Matsumura, 1898), female. A. habitus, dorsal view; B. habitus, ventral view; C. female terminalia, left lateral view; D. female terminalia, ventral view.

FIGURE 8. Kosemia yezoensis (Matsumura, 1898), male. A. habitus, dorsal view; B. habitus, dorsal view.