Many species shown on this page are not endemic to a single country. Typically if a cicada can be found in one country in Indo-China (Cambodia, Laos, Malaysia, Myanmar, Singapore, Thailand, Vietnam), it will be found in many others, as well as southern China.
Click/tap the images for larger versions, the species name and the name of the photographer.
Ambragaeana Chou & Yau, 1985

Ambragaeana ambra Chou & Yao, 1985
Ambragaeana ambra is found in Indo-China and China.
Angamiana Distant, 1890

Angamiana floridula Distant, 1904
Angamiana floridula is found in Indo-China and China.
Ayuthia Distant, 1919

Ayuthia spectabile Distant, 1919. Female.
Ayuthia spectabile is found in Indo-China and China.
Becquartina Kato, 1940

Becquartina electa (Jacobi, 1902) from Thailand.
Becquartina electa is found in Indo-China and China.

Becquartina versicolor Boulard, 2005 Thailand.
Becquartina versicolor is found primarily in Thailand, but I imagine it can be found in adjacent nations as well.
Callogaeana Chou & Yao, 1985

Callogaeana festiva festiva (Fabricius, 1803). Formerly Gaeana festiva.
Callogaeana festiva festiva is found in Indo-China and China.
Chremistica Stål, 1870
Cicadmalleus
Cryptotympana Stål, 1861

Cryptotympana aquila (Walker, 1850) from Thailand.
Cryptotympana aquila has a huge range from Korea south to Indo-China, as well as, Borneo, Sumatra and Brunei.

Female Cryptotympana atrata (Fabricius, 1775) from Korea.
Cryptotympana atrata has a large range from Indo-China north to Korea.

Cryptotympana mandarina Distant, 1891
Distantalna Boulard, 2009

Distantalna splendida (Distant, 1878)
Dundubia Amyot & Audinet-Serville, 1843

Dundubia sp.

Dundubia spiculata Noualhier, 1896
Euterpnosia Matsumura, 1917

Euterpnosia chibensis
Formotosena Kato, 1925

Formotosena montivaga (Distant, 1889)
Gaeana Amyot & Audinet-Serville, 1843

Gaeana cheni Chou & Yao, 1985
Hyalessa China, 1925

Hyalessa maculaticollis maculaticollis (de Motschulsky, 1866)
Huechys Amyot & Audinet-Serville, 1843

Huechys sanguinea (Degeer, 1773).
H. sanguinea can be found throughout Asia, including China, Indo-China, India & Pakistan.
Lyristes Horváth, 1926
Depending on who you ask, the Genus is Lyristes or Tibicen, so I’ll mention both.

Lyristes flammatus or Tibicen flammatus (Distant, 1892)
L. flammatus aka T. flammatus (there is some dispute over the name of the genus) can be found in Japan, Korea and China.
Macrosemia Kato, 1925

Macrosemia chantrainei Boulard, 2003

Macrosemia tonkiniana (Jacobi, 1905)

Macrosemia umbrata
Orientopsaltria Kato, 1944

Orientopsaltria beaudouini Boulard, 2003
Platylomia Stål, 1870

Platylomia radah (Distant, 1881)
Platypleura Amyot & Audinet-Serville, 1843

Platypleura capitata (Olivier, 1790)

Platypleura mira Distant, 1904

Platypleura mokensis Boulard, 2003
Pomponia Stål, 1866
Purana Distant, 1905
Salvazana Distant, 1913

Salvazana mirabilis imperialis Distant, 1918

Salvazana mirabilis mirabilis Distant, 1913
Sulphogaeana Chou & Yao, 1985
Tacua Amyot & Audinet-Serville, 1843

Tacua speciosa (Illger, 1980)
Tailanga Distant, 1890

Tailanga binghami Distant, 1890.
T. binghami is found in China and the countries of Indo-China.
Tosena Amyot & Audinet-Serville, 1843

Tosena paviei (Noualhier, 1896)

Tosena albata Distant, 1878.
Trengganua Moulton, 1923
Trengganua sibylla is found in Malaysia and Thailand.
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Links for further research:
Southeast Asia
India
Japan
Cicada species names and locations verified using The Catalogue of the Cicadoidea (Hemiptera: Auchenorrhyncha) by Allen F Sanborn.