Kosemia Matsumura

Qi, Shengping, Hayashi, Masami & Wei, Cong, 2015, A review of the cicada genus Kosemia Matsumura (Hemiptera: Cicadidae), Zootaxa 3911 (4), pp. 451-492 : 453-454

Key to the males of the species of Kosemia Matsumura

1. Fore wing with basal half infuscated...................................................... K. mogannia comb. n.

- Fore wing hyaline without infuscations.................................................................... 2

2. Abdominal sternites mostly black with narrow testaceous red posterior margins; male clasper with a tiny spine at the median part of inner margin.................................................................. K. chinensis comb. n.

- Abdominal sternites not as above; clasper without such tiny spine............................................... 3

3. Veins M and CuA of fore wing fused at basal cell................................................... K. yezoensis

- Veins M and CuA of fore wing contiguous at basal cell but not fused............................................. 4

4. Vertex generally reddish brown; mesonotum castaneous or brown............................................... 5

- Vertex generally black; mesonotum black with some heterochromatic markings.................................... 6

5. Abdominal tergites castaneous with narrow ochraceous posterior margins; clasper with basal half closely meeting the other one, apical half nearly straight............................................................. K. castanea sp. n.

- Abdominal tergites black with narrow yellow posterior margins; clasper meeting the other one at base then strongly curved anterolaterally..................................................................... K. guanzhonensis sp. n.

6. Fore wing with costal vein remarkably arched, testaceous red...................................... K. fuscoclavalis

- Fore wing with costal vein almost straight or slightly arched, olivaceous, light brown or pale ochraceous................ 7

7. Mesonotum with two central deltoid spots always distinctly pale yellow; cruciform elevation large, with anterior arms dis- tinctly longer than posterior arms......................................................................... 8

- Mesonotum entirely black or with two central deltoid spots fuzzy brown; cruciform elevation small, with anterior arms as long as posterior arms...................................................................................... 9

8. Mesonotum with a slender line in the same color of deltoid spot on each side of disk, which is connected with corresponding deltoid spot and extends posteriorly to anterior arm of cruciform elevation................................ K. radiator

- Mesonotum without markings behind the deltoid spot on each side of disk............................. K. admirabilis

9. Venter of abdomen black or black brown......................................................... K. yamashitai

- Venter of abdomen reddish brown or tawny................................................................ 10

10. Postclypeus black with a tawny or reddish brown patch apically; abdominal sternite VII smoothly narrowing caudally; upper lobe of pygofer large, with apex broadly rounded in lateral view.......................................... K. phaea

- Postclypeus black, without markings; abdominal sternite VII broad at base and abruptly narrowed at half length; upper lobe of pygofer small, with apex somewhat acute in lateral view............................................ K. prominentis