Characters. — Body robust. somewhat short; abdomen in male about as long as space between apex of head and base of cruciform elevation; head broad, truncate anteriorly, including eyes a little or scarcely broader than base of mesonotum, ocelli about twice and sometimes thrice the distance from eyes as from each other, face moderately convex not prominent above; pronotum with the lateral margins ampliated or laminately medially angulate ; anterior femora not prominently spined; metasternum with a Central elevated plate-like process, which is centrally sulcated and posteriorly somewhat sinuately truncate; tympana practically concealed by the tympanal flaps or coverings; opercula in male short, broad, their apices more or less convexly rounded ; tegmina and wings either hyaline or more or less opaquely coloured, tegmina with the basal cell a little longer than broad, the coastal membrane only moderately dilated or arched at base, apical areas eight in number. Oxypieura, Amyot & Serville, merely includes species with hyaline non-opaque tegmina and wings: Pcecilopsaltria, Stal was regarded as distinct from Platypleura by the slightly greater width of the head including eyes ; this form being more dominant in the Oriental Region, while the character of typical Platy pleura is a marked feature in the Ethiopian species.
The illustration and genus description comes from the journal Genera Insectorum, and a specific article from 1913 by W. L. Distant titled Homoptera. Fam. Cicadidae, Subfam, Cicadinae. Read it on the Biodiversity Heritage Library website.
Cicada season in Japan, like North America, seems to be best from June to September, peaking in August. Different cicada species emerge at different times of the year, but the majority of them are active during the summer.
Cicadas are very popular in Japan, and they find their way into pop culture (Anime, live action kids shows like Ultraman). This photo features a cicada toy when spun, makes a sound, some cicada clicker toys, a plush Oncotympana, a Seminingen (bad guy from Ultraman), and Yotsuba a green-haired girl who has caught a cicada (Lyristes japonicus perhaps):
Cicada News & Photos
The best place, I’ve found, to keep track of which cicadas are out in Japan is Twitter. You can search Twitter yourself for セミ and you’ll find many results — most Tweets are references to pop culture, but occasional photos and actual information about actual cicadas.
These are many of the Twitter feeds I follow. You don’t need to belong to Twitter to view their feeds, but it’s more fun if you join.