Kosemia fuscoclavalis ( Chen, 1943 )

Qi, Shengping, Hayashi, Masami & Wei, Cong, 2015, A review of the cicada genus Kosemia Matsumura (Hemiptera: Cicadidae), Zootaxa 3911 (4), pp. 451-492 : 466-468

Kosemia fuscoclavalis ( Chen, 1943)

Figures 12–13

Melampsalta fuscoclavalis Chen, 1943: 39 .

Melampsalta fuscoclavalis chungnanshana Chen, 1943: 40 . Cicadetta fuscoclavalis: Nast, 1972: 152 .

Leptopsalta fuscoclavalis: Chou et al., 1997: 52 . Kosemia fuscoclavalis: Sanborn, 2013: 524 .

Material examined. 1♂ ( NWAFU), Shaanxi Prov., Zhongnan Mountain, 1-v-1936, coll. unknown.

Description. Male. Ground color of body black with greyish and silvery pile.

Head ( Figs. 12 A–D). Head including eyes narrower than base of mesonotum; paramedian posterior margin of vertex with pale testaceous. Ocelli reddish. Eyes dark brown. Postclypeus, supra-antennal plate, genae and anteclypeus pale testaceous with dense, long silvery pile; transverse grooves of postclypeus slender and black, two rather large black patches at base of postclypeus approaching to one another but not meeting medially. Antennae, lora and two-thirds of rostrum black or black brown.

Thorax ( Figs. 12 C–D). Pronotum black with margins and central longitudinal fascia pale testaceous, the latter slightly widened anteriorly and much widened near posteriorly, where it contains a small black spot. Lateral part of pronotal collar slightly ampliate laterally and rounded; lateral angle well ampliate posterolaterally. Mesonotum black with two central obconical spots, lateral margin and cruciform elevation pale testaceous.

Wings ( Figs. 12 A–B). Fore wing hyaline, distinctly broader, with costal vein distinctly arched; costal membrane and costal vein testaceous red; venation of basal two-thirds fuscous brown, apical one-third piceous; basal membrane sanguineous; veins M and CuA contiguous only at basal point. Hind wing with faintly infuscation narrowly along vein 2A to its distal end and around ambient vein of cubital cell 2 and anal cell 1; plaga on most of 3A and basal part of jugum also infuscated.

Legs ( Fig. 12 G). General color reddish ochraceous. Wedge-shaped spot on front coxa, spots on each mid and hind coxa, streaks on mid and hind femur and tibiae, all black. Fore femur with three strong spines beneath, all slightly slanted, decreasing in size from primary to tertiary spine; a tiny spine divided from tertiary spine.

Opercula ( Fig. 12 E). Somewhat reddish ochraceous or pale testaceous, covered with scarce silvery pile; inner margin obtusely angulated; lateral margin weakly oblique; posterior margin convexly rounded. Meracanthus small, slightly pale testaceous.

Abdomen ( Figs. 12 A–B, E–F). Abdomen as long as head and thorax together. Timbal with three long ribs. Abdominal tergites black, gradually attenuated posteriorly; tergite I, spot on each lateral area of tergite II, posterior margins of tergites III–VII and posterior portion of tergite VIII, all pale testaceous; tergite VIII with long greyish pile; posterior margin of tergite VIII a little indented medially. Abdominal sternites testaceous, with silverly scattered pile; sternites and epipleurites III–VII with a black spot on each sternite, diminishing in size posteriorly; sternite VIII slightly flat and shorter than sternite VII.

Genitalia ( Figs. 13 A–D). Pygofer black dorsally, pale testaceous laterally and posteriorly. Dorsal beak of pygofer moderately long and spine-shaped, narrowly pointed at apex. Upper lobe of pygofer slightly concave, distant from dorsal beak, broadly triangular in lateral view, apex obtuse. Median lobe of uncus small, apex slightly upswept in lateral view, paramedian area slightly convex in ventral view. Clasper slightly elongated, digitate, meeting the other one at base then separated anterolaterally; apex obtuse.

Measurements. (1♂) (in mm), Body length: 20; fore wing length: 20; fore wing width: 8.0; width of head including eyes: 5.5; pronotum width (including pronotal collar): 7.2; mesonotum width: 6.1.

Distribution. China (Shaanxi).

Remarks. This species also shows some variability in body color: postclypeus black with apical and lateral portions pale testaceous; pronotum without central longitudinal fascia; mesonotum with two wedge-shaped spots on disk; opercula blackish, with posterior margin fuscous; sternite VIII not flattened at posterior portion. This variation was formerly named as K. fuscoclavalis var. chungnanshana ( Chen, 1943) .

This species can be easily distinguished from other species of Kosemia by the following characteristics: lateral margin of pronotum pale testaceous; fore wing with costal vein remarkably arched, testaceous red.

Figures

FIGURE 12. Kosemia fuscoclavalis (Chen, 1943), male. A. habitus, ventral view; B. habitus, dorsal view; C. head and thorax, dorsal view; D. face; E. thorax and anterior part of abdomen, ventral view; F. timbal, dorsal view; G. left fore leg, showing the spines on fore femur.

FIGURE 13. Kosemia fuscoclavalis (Chen, 1943), male. A, C. male genitalia, left lateral view; B, D. male genitalia, ventral view (clasper partially broken).